Numerical evaluation of seismic response of shallow foundation on loose silt and silty sand

Journal of Earth system science

Ali Asgari1¹  Aliakbar Golshani1¹  Mohsen Bagheri2² 

[1] Department of Civil Engineering, Tarbiat Modares University, Tehran, Iran.$$;Department of Civil Engineering, Babol University of Technology, Babol, Iran.$$

关键词: Liquefaction;    soil type;    thickness of liquefiable soil;    earthquake;    deformation.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

This study includes the results of a set of numerical simulations carried out for sands containing plastic/non-plastic fines, and silts with relative densities of approximately 30−40% under different surchargeson the shallow foundation using FLAC 2D. Each model was subjected to three ground motion events, obtained by scaling the amplitude of the El Centro (1940), Kobe (1995) and Kocaeli (1999) earthquakes. Dynamic behaviour of loose deposits underlying shallow foundations is evaluated through fully coupled nonlinear effective stress dynamic analyses. Effects of nonlinear soil structure interaction (SSI) were also considered by using interface elements. This parametric study evaluates the effects of soil type, structure weight, liquefiable soil layer thickness, event parameters (e.g., moment magnitude of earthquake (𝑀𝑤), peak ground acceleration PGA, PGV/PGA ratio and the duration of strong motion (𝐷5−95)and their interactions on the seismic responses. Investigation on the effects of these parameters and their complex interactions can be a valuable tool to gain new insights for improved seismic design and construction.

【 授权许可】

Unknown