桩-土-结构体系随机地震响应的实用计算方法及参数分析

Parametric Analysis and Practical Calculation Method for the Stochastic Seismic Response of Soil-Pile-Structure Interaction System

摘要:

考虑地震的随机性和土体的非线性,引入粘弹性边界,提出了一种在谐响应分析中直接输入加速度的加载方式,建立了基于虚拟激励法、等效线性化法和确定性动力有限元法相结合的非线性桩-土-结构体系随机地震响应的实用计算方法。采用该法对单桩支承的剪切型结构进行了较为全面的参数分析。结果表明基岩地震动输入水平,桩长度和土体模量都对结构反应有较大影响。该方法可方便的用于随机地震下桩-土-结构体系的参数分析中。

Abstract:

Considering the randomness of earthquake and the nonlinearity of soil,introducing viscous-spring boundary,a loading pattern of inputting acceleration directly in harmonic response analysis is proposed.The practical calculation method of stochastic vibration response for pile-soi-structure interaction system based on pseudo-excitation method,equivalent linearization method and definite dynamic finite element method is presented.The parametric analyses of the single end-bearing pile structure are conducted in detail using this method.The results show that the parameters as inputting ground motion,pile length and soil modulu have obvious effect to seismic response of the system.The method could be employed to perform parametric analysis of pile-soil-structure interaction system subject with stochastic earthquake conveniently.