Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "footing" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-27 z 27
    Tytuł:
    The Story of the Nearest Relative: Shifts in Footing in Dramaturgical Replayings
    Autorzy:
    Morriss, Lisa
    Smith, Greg
    Powiązania:
    https://bibliotekanauki.pl/articles/623365.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    Conversational Interaction
    Goffman
    Dramaturgical Replaying
    Footing
    Opis:
    This discussion assesses the utility of Goffman’s thinking about conversational interaction for illuminating features of a research interview between one of the two authors (LM) and a fellow social work professional. We use this case to explore aspects of Goffman’s contribution to the sociological understanding of spoken interaction. While many of his ideas offer rich sources of guidance for interactionist and qualitative researchers, the value of Goffman’s (1974) concept of “dramaturgical replaying” has been overlooked. We trace the leading themes of Goffman’s thinking about conversational interaction and show how they can provide an analysis of the story of the “Nearest Relative” that is attentive to its live, improvised enactment. Goffman’s approach to storytelling is shown to be distinct from but complementary to conversation analytic approaches to storytelling.
    Źródło:
    Qualitative Sociology Review; 2019, 15, 2; 74-88
    1733-8077
    Pojawia się w:
    Qualitative Sociology Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental bearing capacity of eccentrically loaded foundation near a slope
    Autorzy:
    Mansouri, Tarek
    Abbeche, Khelifa
    Powiązania:
    https://bibliotekanauki.pl/articles/178276.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    square footing
    bearing capacity
    slope
    relative density
    eccentric load
    Opis:
    Based on the response of small-scale model square footing, the present paper shows the results of an experimental bearing capacity of eccentrically loaded square footing, near a slope sand bed. To reach this aim, a steel model square footing of (150 mm × 150 mm) and a varied sand relative density of 30%, 50% and 70% are used. The bearing capacity-settlement relationship of footing located at the edge of a slope and the effect of various parameters such as eccentricity (e) and dimensions report (b/B) were studied. Test results indicate that ultimate bearing capacity decreases with increasing load eccentricity to the core boundary of footing and that as far as the footing is distant from the crest, the bearing capacity increases. Furthermore, the results also prove that there is a clear proportional relation between relative densities –bearing capacity. The model test provides qualitative information on parameters influencing the bearing capacity of square footing. These tests can be used to check the bearing capacity estimated by the conventional methods.
    Źródło:
    Studia Geotechnica et Mechanica; 2019, 41, 1; 33-41
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective width rule in the analysis of footing on reinforced sand slope
    Autorzy:
    Abdi, Abdelmadjid
    Abbeche, Khelifa
    Athmania, Djamel
    Bouassida, Mounir
    Powiązania:
    https://bibliotekanauki.pl/articles/178217.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bearing capacity
    eccentricity
    footing
    geogrid
    model test
    slope
    Opis:
    This paper presents the results obtained from an experimental programme and numerical investigations conducted on model tests of strip footing resting on reinforced and unreinforced sand slopes. The study focused on the determination of ultimate bearing capacity of strip footing subjected to eccentric load located either towards or opposite to the slope facing. Strip footing models were tested under different eccentricities of vertical load. The obtained results from tests conducted on unreinforced sand slope showed that the increase in eccentricity of applied load towards the slope facing decreases the ultimate bearing capacity of footing. Predictions of the ultimate bearing capacity obtained by the effective width rule are in good agreement with those proposed from the consideration of total width of footing subjected to eccentric load. The ultimate bearing capacity of an eccentrically loaded footing on a reinforced sand slope can be derived from that of axially loaded footing resting on horizontal sand ground when adopting the effective width rule and the coefficient of reduction due to the slope. When increasing the distance between the footing border to the slope crest, for unreinforced and reinforced ground slope by geogrids, the ultimate bearing capacity of footing is no more affected by the slope ground.
    Źródło:
    Studia Geotechnica et Mechanica; 2019, 41, 1; 42-55
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Определение внутренних усилий в фундаментных плитах с выпуклой подошвой под колонны при действии внецентренной нагрузки
    Autorzy:
    Gricuk, M. S.
    Hulboj, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2068390.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    stopa fundamentowa
    podstawa piramidalna
    fundament
    spot footing
    pyramidal base
    foundation
    Opis:
    В cтaтьe дано определениe внутpeнниx yсилий в расчётных сечениях плитных фундаментов с пирамидальной подошвой при действии внецентренной нагрузки.
    Przedstawiono obliczanie sił wewnętrznych w przekrojach obliczeniowych stóp fundamentowych o podstawie piramidalnej przy działaniu mimośrodowego obciążenia. Stwierdzono, że w stopach fundamentowych o podstawie piramidalnej siły wewnętrzne są 30 ÷ 50% mniejsze niż w stopach o podstawie płaskiej.
    Źródło:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2010, 16 (166); 121-125
    0860-7214
    Pojawia się w:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behaviour of eccentrically inclined loaded rectangular foundation on reinforced sand
    Autorzy:
    Gupta, Sujata
    Mital, Anupam
    Powiązania:
    https://bibliotekanauki.pl/articles/1845170.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    eccentric loading
    load inclination
    ultimate bearing capacity
    UBC
    rectangular footing
    geogrid
    Opis:
    This study presents the behaviour of model footing resting over unreinforced and reinforced sand bed under different loading conditions carried out experimentally. The parameters investigated in this study includes the number of reinforced layers (N = 0, 1, 2, 3, 4), embedment ratio (Df/B = 0, 0.5, 1.0), eccentric and inclined ratio (e/L, e/B = 0, 0.05, 0.10, 0.15) and (a = 0°, 7°, 14°). The test sand was reinforced with bi-axial geogrid (Bx20/20). The test results show that the ultimate bearing capacities decrease with axial eccentricity and inclination of applied loads. The test results also show that the depth of model footing increase zero to B (B = width of model footing), an increase of ultimate bearing capacity (UBC) approximated at 93%. Similarly, the multi-layered geogrid reinforced sand (N = 0 to 4) increases the UBC by about 75%. The bearing capacity ratio (BCR) of the model footing increases with an increasing load eccentricity to the core boundary of footing; if the load eccentricities increase continuity, the BCR decreases. The tilt of the model footing is increased by increasing the eccentricity and decreases with increasing the number of reinforcing layers.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 2; 74-89
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behavior of Vertically Confined Square Footing on Reinforced Sand under Centric Inclined Loading
    Autorzy:
    Kirtimayee, B.
    Samadhiya, Narendra Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/2172877.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    centric inclined loading
    load intensity
    settlement
    geogrid
    sand
    square footing
    Opis:
    This study presents the behavior of vertically confined square footing on geogrid-reinforced sand under centric inclined loading through a series of experimental tests. The load was applied at 5°, 10° and 20° angles of inclination with the vertical. The tests were conducted on surface footing, footing with confiner and footing with confiner and horizontal reinforcement configurations subjected to inclined loading. Parametric variations like depth of the confiner (d=1B, 1.5B, 2B), number of geogrid layers (N; varies with variation in depth of confiner), and spacing between horizontal reinforcements (Y=0.25B, 0.5B, 0.75B, 1B) have been investigated at the top surface dimension of confiner (D) as 1.0B, 1.5B and 2.0B (where B is the width of the model footing). Results show that combined effect of confiner and horizontal reinforcement increases the ultimate bearing capacity of footing significantly compared to only confiner for all angle of inclinations. It can also be observed that load bearing capacities decrease with increase in angles of inclination and record the minimum improvement at 20° angle of inclination. Improvement in bearing capacities and reduction in settlement of footing analyzed in terms of bearing capacity ratio (BCR) and settlement reduction factor (SRF) are compared for all footing configurations. To summarize, the test results showed that confiner along with reinforcement can be considered as an economic ground improvement technique for shallow foundations to counter against heavily inclined loading.
    Źródło:
    Studia Geotechnica et Mechanica; 2022, 44, 3; 224--238
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osiadania stóp fundamentowych na piaskach
    Settlements of pad footings on sands
    Autorzy:
    Dołżyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/403037.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    stopy fundamentowe
    piaski
    osiadania stóp
    pad footings
    sands
    pad footing settlement
    Opis:
    W pracy przedstawiono zagadnienie osiadań stóp fundamentowych na piaskach. Wartości osiadań oszacowano stosując wzory otrzymane z teorii sprężystości, przyjmując wartości modułu sprężystości z normy PN-81/B-03020 i otrzymane teoretycznie. Dla piasków kwarcowych moduł sprężystości zależy od wskaźnika porowatości (stopnia zagęszczenia) i poziomu naprężeń. Norma PN-81/B-03020 nie uwzględnia zależności modułu sprężystości od poziomu naprężeń (wielkości stopy). Otrzymane osiadania stóp odpowiadające wartościom teoretycznym modułu sprężystości są znacząco niższe od wartości odpowiadających wartościom normowym modułów dla dużych stóp fundamentowych posadowionych na średnich i grubych piaskach w stanie luźnym oraz średnio zagęszczonym. Stosując inżynierskie sposoby obliczeń osiadań stóp bardziej realne wartości otrzymamy określając moduły sprężystości piasków teoretycznie niż stosując wartości normowe.
    This paper aim to present the problem of pad footing settlement on sands. Using the empirical procedure, the settlement of pad footing is a function of Young's modulus. In this paper two values of Young's modulus are used, one value is taken from PN-81/B-03020 and the other one is obtained from theoretical equation. The value of Young's modulus obtained from the theoretical equation is a function of void ratio (e) and the level of stress (size of foundation). The value of Young's modulus shown in PN-81/B-03020 is a function of density index (ID), but is independent of stress level. This paper shows that settlement of pad footing on sand is much less if theoretical value of Young's modulus is used in calculation, especially for a big pad footing on loose or medium compacted coarse and medium sands. So, if theoretical value of Young's modulus is used, the calculated value of pad footing settlement is more realistic.
    Źródło:
    Budownictwo i Inżynieria Środowiska; 2010, 1, 4; 269-273
    2081-3279
    Pojawia się w:
    Budownictwo i Inżynieria Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Random analysis of bearing capacity of square footing using the LAS procedure
    Autorzy:
    Kawa, M.
    Puła, W.
    Suska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/178223.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    LAS procedure
    Local Average Subdivision
    random fields theory
    square footing
    reliability analysis
    Opis:
    In the present paper, a three-dimensional problem of bearing capacity of square footing on random soil medium is analyzed. The random fields of strength parameters c and φ are generated using LAS procedure (Local Average Subdivision, Fenton and Vanmarcke 1990). The procedure used is re-implemented by the authors in Mathematica environment in order to combine it with commercial program. Since the procedure is still tested the random filed has been assumed as one-dimensional: the strength properties of soil are random in vertical direction only. Individual realizations of bearing capacity boundary-problem with strength parameters of medium defined the above procedure are solved using FLAC3D Software. The analysis is performed for two qualitatively different cases, namely for the purely cohesive and cohesive-frictional soils. For the latter case the friction angle and cohesion have been assumed as independent random variables. For these two cases the random square footing bearing capacity results have been obtained for the range of fluctuation scales from 0.5 m to 10 m. Each time 1000 Monte Carlo realizations have been performed. The obtained results allow not only the mean and variance but also the probability density function to be estimated. An example of application of this function for reliability calculation has been presented in the final part of the paper.
    Źródło:
    Studia Geotechnica et Mechanica; 2016, 38, 3; 3-13
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability analysis of bearing capacity of square footing on soil with strength anisotropy due to layered microstructure
    Autorzy:
    Kawa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/178907.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    layered microstructure
    square footing
    strength anisotropy
    reliability analysis
    probability of failure
    factor of safety
    Opis:
    The paper deals with reliability analysis of square footing on soil with strength anisotropy. The strength of the soil has been described with identified anisotropic strength criterion dedicated to geomaterials with layered microstructure. The analysis assumes dip angle α and azimuth angle β which define direction of lamination of the structure to be random variables with given probability density functions. Bearing capacity being a function of these variables is approximated based on results of deterministic simulations obtained for variety of orientations. The weighted regression method by Kaymaz and McMahon within the framework of Response Surface Method is used for the approximation. As a result of analysis, global factor of safety that corresponds to assumed value of probability of failure is determined. The value of the safety factor denotes the ratio between the value of the design load and the mean value of bearing capacity which is needed to reduce the probability of failure to the acceptable level. The procedure of calculating the factor has been presented for two different cases. In the first case, no information about lamination direction of the soil has been provided and thus all the orientations are assumed to be equally probable (uniform distribution). In the second case, statistical information including mean, variance and assumed probability distribution for both α and β angle is known. For the latter case, using results obtained for few different values of mean of angle α, also the influence of strength anisotropy on the value of global factor of safety is shown.
    Źródło:
    Studia Geotechnica et Mechanica; 2015, 37, 4; 19-28
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Size Effects in Problems of Footings on Sand within Micro-Polar Hypoplasticity
    Autorzy:
    Tejchman, J.
    Górski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241079.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    footing
    micro-polar hypoplasticity
    sand
    shear localization
    size effect
    stratified sampling
    void ratio
    Opis:
    Numerical FE investigations of size effects in problems of footings on sand were performed. Micro-polar hypoplastic constitutive model was used to describe a mechanical behaviour of a cohesionless granular material during a monotonic deformation path. The FE analyses were carried out with three different footing widths. In deterministic calculations, a uniform distribution of initial void ratio was used. In statistical calculations, initial void ratios took the form of random spatial fields described by a truncated Gaussian random distribution. In order to reduce the number of stochastic realizations without sacrificing the accuracy of the calculations, a stratified sampling method was applied. The numerical results were compared with corresponding laboratory tests by Tatsuoka et al (1997). The numerical results show that the bearing capacity of footings decreases with increasing specimen size. If the initial void ratio is stochastically distributed, the mean bearing capacity of footings may be larger than the deterministic value. The statistical size effect is smaller than the deterministic one.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2008, 55, 3-4; 95-124
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultimate Bearing Capacity of Strip Footing on Sand Underlain By Clay Under Inclined Load
    Autorzy:
    Dutta, Rakesh Kumar
    Khatri, Vishwas Nandkishor
    Kaundal, Nitesh
    Powiązania:
    https://bibliotekanauki.pl/articles/27314700.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    strip footing
    bearing capacity
    layered soils
    load
    ława fundamentowa
    nośność
    grunt wielowarstwowy
    obciążenie
    Opis:
    This paper presents the bearing capacity determination of strip footing placed on sand underlain by clay and subjected to inclined loading. The bearing capacity equation is derived within the framework of limit equilibrium by following the projected area approach. The inclinations of load spread were selected by performing an additional finite element analysis. A parametric study was conducted to highlight the effect of various input parameters such as i) the thickness of the top sand layer, ii) embedment depth of footing, iii) the friction angle of sand and cohesion of clay, and iv) inclination of the applied load. The obtained results for a vertically loaded footing are slightly underestimated with that available in the literature. The computed bearing capacity values for a foundation with inclined loading compare favorably for lower inclination angle but slightly overestimates for higher load inclination angle, concerning that obtained using the available formula in the literature.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 1; 116--137
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of ultimate bearing capacity of rectangular footing on layered sand
    Autorzy:
    Panwar, V.
    Dutta, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/952456.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    rectangular footing
    finite element analysis
    bearing capacity
    layered sandstone
    analiza elementów skończonych
    nośność podłoża
    Opis:
    Purpose: The purpose of this study is to investigate the ultimate bearing capacity of the rectangular footing resting over layered sand using finite element method. Design/methodology/approach: Finite element analysis was used to investigate the dimensionless ultimate bearing capacity of the rectangular footing resting on a limited thickness of upper dense sand layer overlying limitless thickness of lower loose sand layer. The friction angle of the upper dense sand layer was varied from 41° to 46° whereas for the lower loose sand layer it was varied from 31° to 36°. Findings: The results reveal that the dimensionless ultimate bearing capacity was found to increase up to an H/W ratio of about 1.75 beyond which the increase was marginal. The results further reveal that the dimensionless ultimate bearing capacity was the maximum for the upper dense and lower loose sand friction angles of 46° and 36°, while it was the lowest for the upper dense and lower loose sands corresponding to the friction angle of 41° and 31°. For H/W = 0.5 and 2, the dimensionless bearing capacity decreases with the increase in the L/W ratio from 0.5 to 6 beyond which the dimensionless ultimate bearing capacity remains constant for all combinations of parameters. The results were presented in nondimensional manner and compared with the previous studies available in literature. Research limitations/implications: The analysis is performed using a ABAQUS 2017 software. The limitation of this study is that only finite element analysis is performed without conducting any experiments in the laboratory. Further the study is conducted only for the vertical loading. Practical implications: This proposed numerical study can be used to predict the ultimate bearing capacity of the rectangular footing resting on layered sand. Originality/value: The present study gives idea about the ultimate bearing capacity of rectangular footing when placed on layered sand (dense sand over loose sand) as well as the effect of thickness of top dense sand layer on the ultimate bearing capacity. The findings could be used to calculate the ultimate bearing capacity of the rectangular footing on layered sand.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2020, 101, 1; 15-26
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of positions of the geotextile on the load-settlement behaviour of circular footing resting on single stone column by 2D Plaxis software
    Autorzy:
    Yadav, J. S.
    Kumar, K.
    Dutta, R. K.
    Garg, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055761.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    clay bed
    circular footing
    stone column
    geotextile
    numerical analysis
    kolumny kamienne
    geotkanina
    analiza numeryczna
    Opis:
    Purpose: This study aims to study the load – settlement behaviour of circular footing rested on encased single stone column. Design/methodology/approach: The effect of vertical, horizontal and combined verticalhorizontal encasement of stone column on the load carrying capacity were examined numerically. The effect of stone column dimension (80 mm and 100 mm), length (400 mm and 500 mm), and spacing of reinforcement on the load carrying capacity and reinforcement ratio were assessed. Findings: The obtained results revealed that the load carrying capacity of geotextile encased stone columns are more than ordinary stone columns. For vertically encased stone columns as the diameter increases, the advantage of encasement decreases. Whereas, for horizontally encased stone column and combined vertical- horizontal encased stone column, the performance of encasement intensifies as the diameter of stone column increases. The improvement in the load carrying capacity of clay bed reinforced with combined verticalhorizontal encased stone columns are higher than vertical encased stone columns or horizontal encased stone column. The maximum performance of encasement was observed for VHESC1 of D = 80 mm. Research limitations/implications: For this study, the diameter of footing and stone column was kept same. The interface strength factor between stone column and clay bed was not considered. Practical implications: The encased stone column could be use improve the laod bearing capacity of weak soils. Originality/value: Many studies are available in literature regarding use of geosynthetic as vertical encasement and horizontal encasement of stone column. The study on combined effect of vertical and horizontal encasement of stone column on load carrying capacity of weak soil is very minimal. Keeping this in view, the present work was carried out.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 107, 2; 75--85
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bearing capacity of E-shaped footing on layered sand
    Autorzy:
    Nazeer, S.
    Dutta, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818792.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    square footing
    E-shaped footing
    finite element analysis
    bearing capacity
    layered sandstone
    thickness of upper layer
    friction angle
    stopa fundamentowa
    analiza elementów skończonych
    nośność podłoża
    piaskowiec warstwowy
    grubość warstwy wierzchniej
    kąt tarcia
    Opis:
    Purpose: The purpose of this study is to estimate the ultimate bearing capacity of the E-shaped footing resting on two layered sand using finite element method. The solution was implemented using ABACUS software. Design/methodology/approach: The numerical study of the ultimate bearing capacity of the E-shaped footing resting on layered sand and subjected to vertical load was carried out using finite element analysis. The layered sand was having an upper layer of loose sand of thickness H and lower layer was considered as dense sand of infinite depth. The various parameters varied were the friction angle of the upper (30° to 34°) and lower (42° to 46°) layer of sand as well as the thickness (0.5B, 2B and 4B) of the upper sand layer. Findings: The results reveal that the dimensionless ultimate bearing capacity was found to decrease with the increased in the H/B ratio for all combinations of parameters. The dimensionless ultimate bearing capacity was maximum for the upper loose sand friction angle of 34° and lower dense sand friction angle of 46°. The results further reveal that the dimensionless bearing capacity of the E-shaped footing was higher in comparison to the dimensionless bearing capacity of the square footing on layered sand (loose over dense). The improvement in the ultimate bearing capacity for the E-shaped footing was observed in the range of 109.35% to 152.24%, 0.44% to 7.63% and 0.63% to 18.97% corresponding to H/B ratio of 0.5, 2 and 4 respectively. The lowest percentage improvement in the dimensionless bearing capacity for the E-shaped footing on layered sand was 0.44 % at a H/B = 2 whereas the highest improvement was 152.24 % at a H/B = 0.5. Change of footing shape from square to E-shaped, the failure mechanism changes from general shear to local shear failure. Research limitations/implications: The results presented in this paper were based on the numerical study conducted on E-shaped footing made out of a square footing of size 1.5 m x 1.5 m. However, further validation of the results presented in this paper, is recommended using experimental study conducted on similar size E-shaped footing. Practical implications: The proposed numerical study can be useful for the architects designing similar types of super structures requiring similar shaped footings. Originality/value: No numerical study on E-shaped footing resting on layered sand (loose over dense) were conducted so far. Hence, an attempt was made in this article to estimate the bearing capacity of these footings.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 105, 2; 49--60
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of bearing capacity of skirted irregular pentagonal footings on different sands
    Autorzy:
    Thakur, A
    Dutta, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818797.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    bearing capacity
    sands
    friction angle
    pentagonal footing
    singly skirted
    doubly skirted
    nośność
    piaski
    kąt tarcia
    Opis:
    Purpose: The paper presents an experimental and numerical study to evaluate the bearing capacity of unskirted, singly and doubly skirted irregular pentagonal footings on different sands (S1, S2, S3) at a relative density of 30 %. The skirt depth of the footing was varied from 0.0B to 1.5B (B is the width of the square footing). Design/methodology/approach: The experimental and numerical study of the singly and doubly skirted irregular pentagonal footing resting on sands was modelled in a test tank and Plaxis 3D software respectively. Findings: The results of this study reveal that the bearing capacity was higher for the skirted irregular pentagonal footings on sand S3 followed by sand S2 and S1. The lowest percentage improvement for the singly skirted footing on sand S3 was 18.51% at a Ds/B = 0.25 whereas the highest improvement was 90.81% at a Ds/B = 1.50 for the singly skirted footing on sand S2. The highest percentage improvement for the doubly skirted footing on sand S2 was 95.13% at a Ds/B = 1.5 whereas the lowest improvement was 23.70% at a Ds/B = 0.25 the doubly skirted footing on sand S3. The results further revealed that the numerically obtained bearing capacity was marginally higher in comparison to the one obtained experimentally for the footings on all sands. Further, the experimental results validated the results obtained numerically with an average deviation of 8%. The percentage improvement in the bearing capacity was higher for the irregular pentagonal footing resting on sand S2 in comparison to sand S3 and S1. The settlement response of the irregular pentagonal footings is unchanged by increasing the number of elements beyond 7700. Both the experimental and numerical studies revealed a linear elastic behaviour at Ds = 0.5B, while the experimentally obtained pressure-settlement ratio plot shows a clear failure at Ds= 1B and 1.5B. Research limitations/implications: The results presented in this paper were based on the experimental and numerical study conducted on small scale model footings. However, for the actual footings, further study is recommended using full-scale field size footings to generalize the results. Originality/value: No experimental and numerical studies on singly and doubly skirted irregular pentagonal footings were conducted so far. Hence, an attempt was made in this article to predict the bearing capacity of these footings experimentally and using Plaxis 3D respectively.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 105, 1; 5--17
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of bearing capacity of skirted octagonal footings resting on different sands
    Autorzy:
    Thakur, A.
    Dutta, R.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175811.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    bearing capacity
    sands
    octagonal footing
    singly skirted (SS)
    doubly skirted (DS)
    nośność
    piaski
    stopa fundamentowa ośmiokątna
    Opis:
    Purpose: After a thorough study of literature it is concluded that the studies related to unskirted/skirted octagonal footings on sand have not yet been investigated. Thus, this paper presents a numerical analysis to assess the ultimate bearing capacity of the unskirted, unskirted-embedded, singly and doubly skirted octagonal footings resting on different sands (S1, S2, and S3). The length of skirt and depth of the embedded footing were varied from 0.0B to 1.5B. Design/methodology/approach: The numerical square and octagonal footing with singly and doubly skirted footing models were developed using Plaxis 3D software. Findings: The results of the doubly skirted octagonal footings ultimate bearing capacity were marginally higher in comparison to the singly skirted footing at all normalised skirt depths as well as for all sands up to a Ds/B ratio 0.25 beyond which the increase in the ultimate bearing capacity in case of doubly skirted footing was appreciable. Research limitations/implications: The results presented in this paper were based on numerical analysis. However, for the actual footings the soil placement and compaction, details of skirt construction and the stress level will be different from the numerical analysis. Further investigations using full-scale numerical models simulating field size footings were recommended to generalize the results. Originality/value: No such study on singly and doubly skirted octagonal shaped footings were conducted so far. Hence, an attempt was made in this article to predict the bearing capacity of those footings using Plaxis 3D.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 107, 1; 21--31
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bearing capacity of embedded and skirted E-shaped footing on layered sand
    Autorzy:
    Nazeer, S.
    Dutta, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055759.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    skirted and embedded E-shaped footing
    E-shaped footing
    finite element analysis
    bearing capacity
    layered sandstone
    skirt depth
    embedment depth
    thickness of upper layer
    friction angle
    stopa fundamentowa
    analiza elementów skończonych
    nośność podłoża
    piaskowiec warstwowy
    grubość warstwy wierzchniej
    kąt tarcia
    Opis:
    Purpose: The purpose of this study is to investigate the ultimate bearing capacity of the embedded and skirted E-shaped footing resting on two layered sand using finite element method. The analysis was carried out by using ABACUS software. Design/methodology/approach: The numerical study of the ultimate bearing capacity of the embedded and skirted E-shaped footing resting on layered sand and subjected to vertical load was carried out using finite element analysis. The layered sand was having an upper layer of loose sand of thickness H and lower layer was considered as dense sand of infinite depth. The various parameters varied were the friction angle of the upper (30° to 34°) and lower (42° to 46°) layer of sand, the skirt depth (0B, 0.25B, 0.5B and 1B), the embedment depth (0B, 0.25B, 0.5B and 1B) and the thickness (0.5B, 2B and 4B) of the upper sand layer, where B is the width of the square footing. Findings: The ultimate bearing capacity was higher for the skirted E-shaped footing followed by embedded E-shaped footing and unskirted E-shaped footing in this order for all combinations of variables studied. The improvement in the ultimate bearing capacity for the skirted E-shaped footing in comparison to the embedded E-shaped footing was in the range of 0.31 % to 61.13 %, 30.5 % to 146.31 % and 73.26 % to 282.38% corresponding to H/B ratios of 0.5, 2.0 and 4.0 respectively. The highest increase (283.38 %) was observed at φ1 =30° and φ2 =46° corresponding to H/B and Ds/B ratio of 4.0 and 1.0 respectively while the increase was lowest (0.31 %) at φ1 =34° and φ2 =46° at H/B ratio of 0.5 and Ds/B ratio of 0.5. For the skirted E-shaped footing, the lateral spread was more as in comparison to the embedded E-shaped footing. The bearing capacity of the skirted footing was equal the sum of bearing capacity of the surface footing, the skin resistance developed around the skirt surfaces and tip resistance of the skirt with coefficient of determination as 0.8739. The highest displacement was found below the unskirted and embedded E-shaped footing, and at the skirt tip in the case of the skirted E-shaped footing. Further, the displacement contours generated supports the observations of the multi-edge embedded and skirted footings regarding the ultimate bearing capacity on layered sands. Research limitations/implications: The results presented in this paper were based on the numerical study conducted on E shaped footing made from a square footing of size 1.5 m x 1.5 m. However, further validation of the results presented in this paper, is recommended using experimental study conducted on similar size E shaped footing. Practical implications: The proposed numerical study can be an advantage for the architects designing similar types of super structures requiring similar shaped footings. Originality/value: No numerical study on embedded and skirted E shaped footing resting on layered sand (loose over dense) were conducted so far. Hence, an attempt was made in this article to estimate the bearing capacity of the same footings.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 108, 1; 5--23
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Investigation of Square Footing Positioned on Geocell Reinforced Sand by using ABAQUS Software
    Autorzy:
    Juneja, Gaurav
    Sharma, Ravi Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/27314746.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    square footing
    geocell reinforcement
    weak soil
    numerical investigation
    MES
    ABAQUS software
    ława fundamentowa
    zbrojenie
    słabe grunty
    badania numeryczne
    ABAQUS
    Opis:
    The usage of geocell reinforcement for foundations supported on weak soil has been increased these days. The purposed study uses FEM-based ABAQUS software to analyse the behaviour of square footing supported on geocell reinforced sands subjected to static vertical loading. Numerical analysis was performed to find the optimum combination of the different geometric parameters of the geocell reinforcement. Three distinct types of sands were employed in the study with relative densities of 30%, 50%, and 70%. The geometric parameters of the geocell, such as the placement depth of geocell (u), the width (b), and the height (h) of the geocell, were modified in relation to the footing width (B) to access the optimum combination ratios. The inclusion of the geocell reinforcement increases the load-carrying capacity up to 5-6 times compared to unreinforced sand. The results obtained from the numerical analysis were intended to correlate well with the experimental data available in the literature.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 2; 154--173
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of various transmission line models on lightning overvoltages in insulation coordination studies
    Porównanie modeli linii przesyłowych stosowanych do wykonywania analiz przepięciowych w systemach elektroenergetycznych
    Autorzy:
    Oramus, P.
    Florkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/266738.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    GIS substation
    lightning overvoltages
    tower footing
    resistance
    transmission line model
    modele linii przesyłowych
    przepięcia atmosferyczne
    rezystancja uziemienia słupów
    rozdzielnica GIS
    Opis:
    Lightning overvoltages occurring in electrical power systems are especially dangerous for devices installed in network. Lightning transients may cause damages of devices installed in power system. Therefore, analysis of lightning overvoltages in electrical power systems is important to ensure reliability of power supply. For this purpose, development of mathematical models is necessary, however mathematical complexity can lead to slightly different results. In this paper, both various overhead transmission lines models as well as exemplary insulation coordination analysis performed in HV power system have been presented. Simulation results performed for various models of overhead lines implemented in EMTP/ATP software have been presented and compared in this paper.
    Przepięcia atmosferyczne są szczególnie niebezpiecznie dla urządzeń zainstalowanych w sieciach elektroenergetycznych. Z tego powodu, zdeterminowanie poziomu przewidywanych przepięć atmosferycznych jest istotne z punktu widzenia koordynacji izolacji. Do tego celu, konieczne jest opracowanie modeli matematycznych poszczególnych elementów sieci elektroenergetycznej. Jednakże, w zależności od sposobu modelowania, wyniki symulacji mogą się różnić pomiędzy sobą. Artykuł zawiera zestawienie trzech modeli matematycznych linii przesyłowych, mogących posłużyć do przeprowadzania symulacji przepięć atmosferycznych. W artykule przedstawiono wyniki symulacji przepięć atmosferycznych przeprowadzonych dla przykładowego systemu z wykorzystaniem różnych modeli linii przesyłowych.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2014, 40; 81-84
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure Settlement Behaviour and Bearing Capacity of Asymmetric Embedded Plus Shaped Footing on Layered Sand
    Autorzy:
    Rawat, Priyanka
    Dutta, Rakesh Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/2051675.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    granulated blast furnace slag
    soil stabilization
    settlement
    shaped footing
    numerical investigations
    żużel wielkopiecowy granulowany
    stabilizacja gruntu
    osiadanie
    ława fundamentowa
    badania numeryczne
    Opis:
    The aim of the present numerical study was to analyse the pressure settlement behaviour and bearing capacity of asymmetric plus shaped footing resting on loose sand overlying dense sand at varying embedment depth. The numerical investigation was carried out using ABAQUS software. The effect of depth of embedment, friction angle of upper loose and lower dense sand layer and thickness of upper loose sand on the bearing capacity of the asymmetric plus shaped footing was studied in this investigation. Further, the comparison of the results of the bearing capacity was made between the asymmetric and symmetric plus shaped footing. The results reveal that with increase in depth of embedment, the dimensionless bearing capacity of the footings increased. The highest increase in the dimensionless bearing capacity was observed at embedment ratio of 1.5. The increase in the bearing capacity was 12.62 and 11.40 times with respect to the surface footings F1 and F2 corresponding to a thickness ratio of 1.5. The lowest increase in the dimensionless bearing capacity was observed at embedment ratio of 0.1 and the corresponding increase in the bearing capacity was 1.05 and 1.02 times with respect to the surface footing for footings F1 and F2 at a thickness ratio of 1.5.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 3; 152-176
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Seismic Bearing Capacity of a Strip Footing Resting on Reinforced Earth Bed using Pseudo-Static Analysis
    Autorzy:
    Jaiswal, Sagar
    Chauchan, Vinay Bhusan
    Powiązania:
    https://bibliotekanauki.pl/articles/2051717.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    reinforced earth
    bearing capacity
    strip footing
    finite element method
    pseudo-static analysis
    wzmocnienie podłoża
    nośność
    ława fundamentowa
    metoda elementów skończonych
    analiza pseudostatyczna
    Opis:
    The use of geosynthetic reinforcement to enhance the ultimate load-bearing capacity and reduce the anticipated settlement of the shallow foundation has gained sufficient attention in the geotechnical field. The improved performance of the shallow foundation is achieved by providing one or more layers of geosynthetics below the foundation. The full wraparound technique proved to be efficient for the confinement of soil mass and reduction in settlement of foundation however lacks the literature to ascertain the performances of such footing under dynamic loading. In view of the above, the present study examines the effect of geosynthetic layers having a finite length with full wraparound ends as a reinforcement layer, placed horizontally at a suitable depth below the foundation using the finite element modeling (FEM) and evaluates the ultimate load-bearing capacity of a strip footing resting on loose and dense coarse-grained earth beds under seismic loading and further compared to those of footing resting on unreinforced earth bed. Moreover, the effect of horizontal seismic acceleration coefficient (kh) on the ultimate load-bearing capacity has been investigated by varying kh from 0.1 to 0.6 at an interval of 0.1, for both reinforced and unreinforced earth bed having loose and dense soil strata. Furthermore, this study demonstrates that by adopting the new practice of using the geosynthetic reinforcement with the full wraparound ends in foundations, it is possible to support relatively heavier structures under static as well as dynamic loading without allowing large footing settlements. From the outcomes of the present study, it is noted that the ultimate load-bearing capacity of footing resting on loose and dense sand bed found to be improved by 60% and 18% for soils having friction angle of 25° and 40°, respectively compared to respective unreinforced earth beds under static condition.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 2; 117-137
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of nanosilica stabilisation on the bearing capacity under undrained conditions
    Wpływ stabilizacji nanokrzemionką na nośność podłoża gruntowego w warunkach bez odpływu
    Autorzy:
    Tankiewicz, Matylda
    Mońka, Jakub
    Zięba, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/27312167.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    nanokrzemionka
    wytrzymałość na ścinanie bez odpływu
    ściskanie jednoosiowe
    nośność podłoża
    ława fundamentowa
    nanosilica
    undrained shear strength
    unconfined compression
    bearing capacity
    strip footing
    Opis:
    Due to the increasing necessity of building on soils with insufficient bearing capacity, the development of methods for soil improvement is an important geotechnical engineering issue. One of the innovative methods of soil stabilisation is the use of nano-additives. The paper presents the influence of nanosilica on the bearing capacity under the footing under undrained conditions. For this purpose, a simple and quick unconfined compression test was used to evaluate the undrained shear strength of selected silty soil. Tests were conducted for soil without additives and with nanosilica contents of 1, 3 and 5%. All samples were compacted to the maximum dry density in a Proctor apparatus, and strength tests were conducted after 7 days of curing. The results clearly show an increase in undrained shear strength with increasing nanosilica content. Based on these data, a parametric analysis of the bearing capacity under the strip footing was performed for 4 variants of nanosilica content and for 9 loading cases. Thus, the impact of stabilisation in a practical engineering issue was presented. For all load cases the optimal dimensions of the foundation were determined. In addition, for the selected case, calculations were made for a fixed foundation dimension. All computations were performed in accordance with Eurocode 7 with GEO5 software.
    Ze względu na coraz powszechniejszą konieczność posadawienia obiektów na gruntach o niewystarczającej nośności, rozwój metod ulepszania i stabilizacji podłoża gruntowego jest aktualnym wyzwaniem inżynierii geotechnicznej. Jedną z innowacyjnych metod stabilizacji gruntu jest wykorzystanie nanododatków jako materiału stabilizującego. Zaletami tego rozwiązania są mniejsza ilość dodatku wymagana do uzyskania określonej poprawy właściwości mechanicznych gruntu względem tradycyjnych metod oraz mniejszy negatywny wpływ na środowisko. W kontekście ulepszenia podłoża gruntowego nanododatkami wybór nanokrzemionki (nano SiO2) stanowi optymalne rozwiązanie z punktu widzenia skuteczności i kosztów. W pracy przedstawiono wpływ zawartości nanokrzemionki na nośność podłoża pod ławą fundamentową w warunkach bez odpływu. W praktyce warunki te występują przede wszystkim w sytuacjach przejściowych, gdy następuje szybki przyrost obciążeń. W pierwszej kolejności wykonano badania laboratoryjne mające na celu określenie parametrów wytrzymałości wybranego gruntu bez dodatku oraz stabilizowanego nanokrzemionką. W tym celu wykorzystano prosty i szybki test jednoosiowego ściskania pozwalający na ocenę wytrzymałości gruntu w warunkach bez odpływu. Badania laboratoryjne wykonano dla wybranego gruntu pylastego. Testy przeprowadzono dla czystego materiału gruntowego oraz z dodatkiem nanokrzemionki 1, 3 i 5%. Wszystkie próbki zostały zagęszczone do maksymalnej gęstości objętościowej szkieletu gruntowego w aparacie Proctora a testy wytrzymałościowe przeprowadzono po 7 dniach dojrzewania próbek. Badania wykazały średni wzrost wytrzymałości na ścinanie bez odpływu Cu odpowiednio o 18.1%, 54.9% i 76.0% w porównaniu do gruntu bez dodatku. Zaobserwowano również znaczny wzrost modułu siecznego Eu50 tj. odpowiednio 29.7%, 111.0% i 120.1%. W przypadku wytrzymałości stwierdzono liniową zależność wytrzymałości od zawartości nanokrzemionki. Dla sztywności ta zależność była inna, jednak ze względu na duży rozrzut wyników nie można było sformułować jednoznacznych wniosków. Otrzymane dane znacznie odbiegają od tych prezentowanych w literaturze dla podobnych typów gruntów i zawartości nanokrzemionki, co prawdopodobnie spowodowane jest innymi czynnikami wpływającymi na wyniki badań.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 3; 269--284
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza MES-MKEB nieliniowego problemu współdziałania ławy fundamentowej z podłożem gruntowym
    The FEM-CBEM analysis of nonlinear interaction problem of continuous footing and subsoil
    Autorzy:
    Fedczuk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/348845.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    metoda elementów skończonych
    metoda kontaktowych elementów brzegowych
    układ "ława fundamentowa-podłoże gruntowe"
    finite elements method
    contact boundary element method
    system "continuous footing-subsoil"
    Opis:
    Niniejsza praca prezentuje koncepcję zastosowania kombinowanej metody (składającej się z metody elementów skończonych MES i kontaktowych elementów brzegowych MKEB) do analizy trójwymiarowego problemu współdziałania układu "ława fundamentowa-podłoże gruntowe". Zawiera ona elementarne podstawy teoretyczne, uwzględniające sformułowanie globalnego równania równowagi i prezentację sposobu rozwiązania tej relacji (wykorzystującego technikę przyrostowo-iteracyjną, opartą na metodzie Raphsona-Newtona). Zostały zamieszczone wyniki obliczeń dla przykładu układu "ława fundamentowa-podłoże gruntowe" (z użyciem sprężysto-plastycznego modelu gruntu Modified Cam-Clay).
    The following paper presents the concept of using a combined method (consisting of finite element method FEM and contact boundary element method CBEM) to analyze the 3-D interaction problem of system "continuous footing-subsoil". It comprises elementary theoretical basis, considering formulation of global equation of equilibrium and presentation of the method of solution this relation (using a step-iterative technique based upon the Raphson-Newton method). Calulation results for specific example of system "continuous footing-subsoil" (with using elasto-plastic soil model Modified Cam-Clay) was presented.
    Źródło:
    Górnictwo i Geoinżynieria; 2010, 34, 2; 231-238
    1732-6702
    Pojawia się w:
    Górnictwo i Geoinżynieria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nośność na przebicie krępych płyt żelbetowych – badania i analiza metodą S-T
    Punching shear behavior of thick reinforced concrete slabs according to Strut-and-Tie model
    Autorzy:
    Urban, T.
    Krakowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/391037.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    metoda kratownicowa (strut-and-tie)
    przebicie osiowe
    smukłość ścinania
    fundament
    efekt skali
    Strut-and-tie model
    punching shear
    shear slenderness
    footing
    size effect
    Opis:
    W pracy przedstawiono próbę analizy nośności na przebicie płyt krępych za pomocą metody kratownicowej (strut-and-tie, S-T). Procedura obliczeniowa została porównana z wynikami własnych badań eksperymentalnych. Zakres analizy obejmuje wyłącznie elementy bez zbrojenia poprzecznego obciążone osiowo symetrycznie.
    The punching shear behavior of thick reinforced concrete slabs was analyzed in this paper by using strut-and-tie model (S-T). Calculating procedures were compared to our own experimental test results. The analyzed elements were subjected to symmetric loading and without shear reinforcement.
    Źródło:
    Budownictwo i Architektura; 2014, 13, 3; 183-191
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of decision model structure on the selection of a telecommunications tower footing reinforcement alternative
    Wpływ struktury modelu decyzyjnego na wybór wariantu wzmocnienia posadowienia wieży telekomunikacyjnej
    Autorzy:
    Szewczyk, Bartłomiej
    Śladowski, Grzegorz
    Ratoń, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/1852561.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multi-criteria decision analysis
    analytical hierarchy process
    analytical network process
    model decyzyjny
    budownictwo
    wzmocnienie fundamentów
    wieża telekomunikacyjna
    decision model
    civil engineering
    footing reinforcement
    telecommunications tower
    Opis:
    In recent years, we have been able to observe a dynamic development of MCDA (multi-criteria decision analysis) methods, which have become widely used in various sectors, including construction. These methods are characterised by simplicity and one of their key advantages is their simple modelling of non-linear dependencies within decision problems and their analysis under the conditions of incomplete, uncertain and hard-to-measure information. The universality and simple use of these methods does not, however, free the decision-maker from the necessity to adopt the proper approach to modelling and analysing specific decision problems. To highlight the fact that it is the character of the problem that should determine the selection of the method of analysing it and not the other way around, the authors assessed the AHP (Analytic Hierarchy Process) and the ANP (Analytic Network Process) method in terms of verifying the impact of the different decision model structures on analysis outcomes and analysed their sensitivity to input data changes. This analysis was based on the example of selecting a telecommunications tower footing reinforcement alternative. The findings confirmed the significant impact of decision model structure on the ranking of the analysed alternatives.
    W ostatnich latach można zauważyć dynamiczny rozwój metod MCDA (multi-criteria decision analysis), które znalazły powszechne zastosowanie także w budownictwie. Metody te cechuje prostota, a ich istotną zaletą jest łatwe modelowanie nieliniowych zależności w problemach decyzyjnych oraz ich analiza w warunkach niepełnej, niepewnej i trudno mierzalnej informacji. Autorzy niniejszego artykułu przeanalizowali specyfikę dwóch popularnych i uznanych metod wielokryterialnego wspomagania decyzji: metody AHP (Analytic Hierarchy Process) i ANP (Analytic Network Process). Przedmiotem oceny tych dwóch metod jest zagadnienie tzw. strukturyzacji problemu w formie modelu decyzyjnego, która determinuje charakter jego analizy. Ponieważ w praktyce wielu decydentów nie przywiązuje wagi do strukturyzacji problemu, w ramach stosowania w/w metod autorzy swoje rozważania na ten temat oparli na praktycznym przykładzie wyboru wariantu wzmocnienia posadowienia wieży telekomunikacyjnej stanowiącej część Radiowej Stacji Bazowej (RBS) Wierzbięcice w gminie Nysa na terenie Polski. W związku z planowaną modernizacją stacji bazowej i związaną z tym rozbudową infrastruktury antenowej na wieży i zwiększeniem obciążeń zalecono wykonanie wzmocnienia trzonu wieży oraz jej fundamentów. Analizie poddane zostały następujące warianty wzmocnienia fundamentu: V1 dodatkowe stopy fundamentowe, V2 mikropale, V3 płyta żelbetowa. Do oceny wariantów przyjęto siedem kryteriów decyzyjnych: C1 czas wykonania, C2 grunt do wywiezienia, C3 ilość potrzebnego sprzętu, C4 koszt, C5 stabilizacja tymczasowa, C6 stopień skomplikowania robót, C7 wymagania formalno-prawne. Celem przeprowadzonej analizy było ukazanie wpływu struktury modelu decyzyjnego na wybór optymalnego rozwiązania problemu decyzyjnego w świetle przyjętych kryteriów.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 309-321
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nadpłata podatku powstała w wyniku orzeczenia Trybunału Konstytucyjnego
    Overpayment as a result of a judgment of the Constitutional Tribunal
    Autorzy:
    Szymczak, Aneta
    Powiązania:
    https://bibliotekanauki.pl/articles/692936.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    overpayment
    overpayment made as a result of a judgment delivered by the Constitutional Tribunal
    lack of legal footing for tax payment
    effects of the judgment of the Polish Constitutional Tribunal
    nadpłata
    nadpłata powstała w wyniku orzeczenia Trybunału Konstytucyjnego
    zwrot podatku
    skutki wyroków Trybunału Konstytucyjnego
    brak podstawy prawnej
    Opis:
    The paper concerns the concept of overpayment made as a result of a judgment delivered by the Constitutional Tribunal in reference to Article 72 and 74 of the Tax Ordinance Act. Although the doctrine and the judicature of administrative courts view overpayment under Article 74 as stemming from Article 72 of the Tax Ordinance Act, there are certain distinct features of the two. Taking into consideration the potential effects of the judgment of the Polish Constitutional Tribunal, a tax paid when the legal footing of this tax was in existence is considered as being due at the date of payment. A distinction is made between overpayment stemming from article 74 and overpayment stemming from article 72. The latter features a lack of legal footing for tax payment. This distinction also has further implications and consequences.
    Artykuł poświęcony jest analizie pojęcia „nadpłata powstała w wyniku orzeczenia Trybunału Konstytucyjnego”, w tym w szczególności różnicy między nadpłatą z art. 72 Ordynacji podatkowej (o.p.) i nadpłatą z art. 74 o.p. Brak rozróżnienia istoty obu nadpłat powoduje poważne trudności w określeniu ich skutków, co widoczne jest obecnie w orzecznictwie sądów administracyjnych. Ponieważ brak definicji „nadpłaty powstałej w wyniku orzeczenia TK”, próba wskazania jej natury prawnej wymaga przede wszystkim uwzględnienia skutków wyroków Trybunału Konstytucyjnego, określonych w art. 190 ust. 1, 3 i 4 Konstytucji RP. Z powołanych przepisów Konstytucji wynika, że w polskim porządku prawnym wyroki Trybunału mają charakter konstytutywny i działają ex nunc, a więc wywołują skutek na przyszłość. Oznacza to, że do chwili ogłoszenia przepis uznany za niekonstytucyjny obowiązywał w systemie prawa i wywierał skutki prawne. W konsekwencji wynika z tego, że podatek uiszczony na podstawie przepisu, którego zgodność z Konstytucją zakwestionował Trybunał, był w momencie zapłaty podatkiem należnym. Nie można zatem uznać, że – tak jak w wypadku nadpłaty z art. 72 o.p. – mamy do czynienia ze świadczeniem nienależnym, uiszczonym bez podstawy prawnej. Wręcz przeciwnie: podstawa taka istniała, korzystała z domniemania konstytucyjności i nie odpadła z mocą wsteczną. Artykuł 74 o.p., który w zakresie pełnionych funkcji stanowi realizację art. 190 ust. 4 Konstytucji RP na gruncie Ordynacji podatkowej, stanowi podstawę odrębnego roszczenia o zwrot uiszczonego podatku.
    Źródło:
    Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2013, 75, 4; 107-119
    0035-9629
    2543-9170
    Pojawia się w:
    Ruch Prawniczy, Ekonomiczny i Socjologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bearing capacity of rectangular footing on layered sand under inclined loading
    Autorzy:
    Panwar, V.
    Dutta, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055743.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    rectangular footing
    inclined load
    finite element analysis
    bearing capacity
    layered sand
    thickness ratio
    friction angle
    friction angle of upper sand layers
    friction angle of lower sand layers
    load inclination
    podstawa prostokątna
    obciążenie pochyłe
    analiza elementów skończonych
    nośność podłoża
    piaskowiec warstwowy
    współczynnik proporcji
    kąt tarcia
    złoże piaskowe
    nachylenie obciążenia
    Opis:
    Purpose: The study presents the numerical study to investigate the bearing capacity of the rectangular footing on layered sand (dense over loose) using ABAQUS software. Design/methodology/approach: Finite element analysis was used in this study to investigate the bearing capacity of the rectangular footing on layered sand and subjected to inclined load. The layered sand was having an upper layer of dense sand of varied thickness (0.25 W to 2.0 W) and lower layer was considered as loose sand of infinite thickness. The various parameters varied were friction angle of the upper dense (41° to 46°) and lower loose (31° to 36°) layer of sand and load inclination (0° to 45°), where W is the width of the rectangular footing. Findings: As the thickness ratio increased from 0.00 to 2.00, the bearing capacity increased with each load inclination. The highest and lowest bearing capacity was observed at a thickness ratio of 2.00 and 0.00 respectively. The bearing capacity decreased as the load inclination increased from 0° to 45°. The displacement contour shifted toward the centre of the footing and back toward the application of the load as the thickness ratio increased from 0.25 to 1.25 and 1.50 to 2.00, respectively. When the load inclination was increased from 0° to 30°, the bearing capacity was reduced by 54.12 % to 86.96%, and when the load inclination was 45°, the bearing capacity was reduced by 80.95 % to 95.39 %. The results of dimensionless bearing capacity compare favorably with literature with an average deviation of 13.84 %. As the load inclination was changed from 0° to 45°, the displacement contours and failure pattern shifted in the direction of load application, and the depth of influence of the displacement contours and failure pattern below the footing decreased, with the highest and lowest influence observed along the depth corresponding to 0° and 45°, respectively. The vertical settlement underneath the footing decreased as the load inclination increased, and at 45°, the vertical settlement was at its lowest. As the load inclination increased from 0° to 45°, the minimum and maximum extent of influence in the depth of the upper dense sand layer decreased, with the least and highest extent of influence in the range of 0.50 to 0.50 and 1.75 to 2.00 times the width of the rectangular footing, respectively, corresponding to a load inclination of 45° and 0°. Research limitations/implications: The results presented in this paper were based on the numerical study conducted on rectangular footing having length to width ratio of 1.5 and subjected to inclined load. However, further validation of the results presented in this paper, is recommended using experimental study conducted on similar size of rectangular footing. engineers designing rectangular footings subjected to inclined load and resting on layered (dense over loose) sand. Originality/value: No numerical study of the bearing capacity of the rectangular footing under inclined loading, especially on layered soil (dense sand over loose sand) as well as the effect of the thickness ratio and depth of the upper sand layer on displacement contours and failure pattern, has been published. Hence, an attempt was made in this article to investigate the same.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 108, 2; 49--62
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-27 z 27

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies