Co-seismic and post-seismic behavior of an existed shallow foundation and super structure system on a natural sand/silt layered ground
Abstract
Purpose
The purpose of this paper is to evaluate the co-seismic and post-seismic behaviors of an existed soil-foundation system in an actual alternately layered sand/silt ground including pore water pressure, acceleration response, and displacement et al. during and after earthquake.
Design/methodology/approach
The evaluation is performed by finite element method and the simulation is performed using an effective stress-based 2D/3D soil-water coupling program DBLEAVES. The calculation is carried out through static-dynamic-static three steps. The soil behavior is described by a new rotational kinematic hardening elasto-plastic cyclic mobility constitutive model, while the footing and foundation are modeled as elastic rigid elements.
Findings
The shallow (short-pile type) foundation has a better capacity of resisting ground liquefaction but large differential settlement occurred. Moreover, most part of the differential settlement occurred during earthquake motion. Attention should be paid not only to the liquefaction behavior of the ground during the earthquake motion, but also the long-term settlement after earthquake should be given serious consideration.
Originality/value
The co-seismic and post-seismic behavior of a complex ground which contains sand and silt layers, especially long-term settlement over a period of several weeks or even years after the earthquake, has been clarified sufficiently. In some critical condition, even if the seismic resistance is satisfied with the design code for building, detailed calculation may reveal the risk of under estimation of differential settlement that may give rise to serious problems.
Keywords
Acknowledgements
This work was supported by National Nature Science Foundation of China (Grant Nos 41372284 and 51308346), Guangdong Natural Science Foundation (Grant Nos S2013040012443 and 2014A030313551), Natural Science Foundation of SZU (Grant No. 201420) and Scientific and Technical Innovation Foundation of Shenzheng (Grant No. JCYJ20150324140036839).
Citation
Bao, X., Ye, G., Ye, B., Fu, Y. and Su, D. (2016), "Co-seismic and post-seismic behavior of an existed shallow foundation and super structure system on a natural sand/silt layered ground", Engineering Computations, Vol. 33 No. 1, pp. 288-304. https://doi.org/10.1108/EC-05-2015-0134
Publisher
:Emerald Group Publishing Limited
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