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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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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
Wyświetlanie 1-15 z 27

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