水平地震作用下单桩动力响应数值分析

Numerical analysis of dynamic response for single pile under horizontal seismic action

利用MIDAS-GTS软件,对桩-土相互作用体系中单桩受水平地震动力响应进行三维有限元数值模拟,采用弹性阻尼人工边界,分析了不同水平地震作用、桩长、桩径、桩长细比、桩身弹性模量、桩周土弹性模量及土体泊松比等参量对单桩水平位移和弯矩的影响。分析结果表明:合理的选取桩长、桩径等参量能有效提高单桩的抗震性能,同时,桩周土的各参数变化对单桩的水平抗震能力影响较大。

By use of MIDAS - GTS software, the paper carried out three - dimensional finite element nu- merical simulation for single pile in pile - soil interaction system under horizontal seismic dynamic response. With elastic damping artificial boundary, it analyzed the influence of different horizontal earthquake function , the pile length , pile diameter , pile slenderness ratio , the elastic modulus of pile , pile soil elasticity modulus and poisson~ ratio of soil on horizontal displacement and bending moment of single pile. The analy- sis results show that the reasonable selection of pile length, pile diameter and other parameters can effective- ly improve the seismic behavior of single pile, at the same time, the change of the parameters of soil around piles has greater influence on the horizontal seismic capacity of single pile.