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《Journal of Northwest A & F University(Natural Science Edition)》 2011-01
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Numerical analysis of seismic response in wave theory based pile-soil system

FENG Xiao-juan,HUANG Yi,CAO Cai-qin,YAO Kun(Department of Science,Xi'an University of Architecture&Technology,Xi'an,Shaanxi 710055,China)  
【Objective】 The research was conducted to study the seismic response characteristics of the pile-soil system to offer some reference for research on earthquake resistance of engineering structure.【Method】 Based on the dynamic equilibrium equation,the wave equation of visco-elastic soil medium is derived;Using Galerkin Weighted Residual Method,the discrete form of wave equation in time-domain is established;With the software ABAQUS,adopting the finite element and infinite element coupled numerical method,the dynamical response of piles on horizontal seismic is calculated;Seismic wave response characteristics are analyzed in the pile-soil system in different situations of slenderness ratio,superstructure mass or interface between pile and soils.【Result】 The smaller the pile's slenderness ratio is,the bigger the pile's deformation is;The bigger the superstructure mass is,the bigger the inertial force and the effect of the top part of the pile is;The acceleration response of the pile with slippage and without cracks on pile-soil interface is significantly higher than the case without slippage and cracks.【Conclusion】 The factors such as pile's slenderness ratiois,superstructure mass and the behavior of interface between pile and soils all affect the horizontal response of pile in pile-soil system under horizontal seismic.So,in the future pile foundation aseismatic design,we can reasonably choose the design for the above factors according to the law of pile's lateral deformation,so as to improve the aseismatic performances of the pile and superstructure.
【Fund】: 陕西省教育厅专项科研项目“三维桩-土体系的地震波响应研究”(08JK341);; 西安建筑科技大学基础基金项目“基础结构体的地震响应研究”(JC0821)
【CateGory Index】: TU473.1
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