Temat: footing - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

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

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Skocz do pozycji: 8.

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

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Skocz do pozycji: 9.

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

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Skocz do pozycji: 10.

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

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Skocz do pozycji: 11.

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

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Skocz do pozycji: 12.

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

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Skocz do pozycji: 13.

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

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Skocz do pozycji: 14.

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

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Skocz do pozycji: 15.

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

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