Numerical Study of the Ultimate Bearing Capacity of Two Adjacent Rough Strip Footings on Granular Soil: Effects of Rotational and Horizontal Constraints of Footings

被引:2
|
作者
Salari, Mahdi [1 ]
Lezgy-Nazargah, Mojtaba [2 ]
Shafaie, Vahid [3 ]
Rad, Majid Movahedi [3 ]
机构
[1] Kharazmi Univ, Fac Engn, Tehran 1571914911, Iran
[2] Hakim Sabzevari Univ, Dept Civil Engn, Sabzevar 9617976487, Iran
[3] Szechenyi Istvan Univ, Dept Struct & Geotech Engn, H-9026 Gyor, Hungary
关键词
two adjacent footings; ultimate bearing capacity; upper bound limit analysis; rotating and moving constraints; finite element analysis; INTERFERENCE; FOUNDATIONS; DESIGN;
D O I
10.3390/buildings14061653
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
In this paper, the numerical study of the ultimate bearing capacity (UBC) of two closely spaced strip footings on granular soil is investigated using the finite element method (FEM) and upper bound limit analysis (UBLA). Although the UBC of two adjacent footings has previously been studied in other experimental and numerical research, in all the previously reported studies, the footings were not allowed to rotate and move horizontally freely. Due to the deformation of the soil medium, two closely spaced footings are subjected to horizontal movements and tilting, even under central vertical loads. When the two adjacent footings are not permitted to rotate and move in the horizontal directions, the unwanted bending moment and horizontal force act on the footings. Indeed, the UBC of two closely spaced rough footings is evaluated under incorrect constraints in earlier research. In the present research, the UBC of two adjacent rough footings is evaluated with and without these incorrect constraints. The key finding of this study is that constraining the horizontal and rotational movement of the foundation artificially increases the UBC, which does not reflect field conditions. When foundations are permitted to rotate and move horizontally, there is no increase in UBC; however, there is an increased risk of differential settlement and structural instability.
引用
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页数:14
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