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面向设计应用的地震动空间相干函数模型
引用本文:王君杰,陈虎.面向设计应用的地震动空间相干函数模型[J].地震工程与工程振动,2007,27(1):16-23.
作者姓名:王君杰  陈虎
作者单位:同济大学,桥梁工程系,上海,200092
基金项目:国家自然科学基金项目(50478112)
摘    要:本文对现有的常用地震动空间相干模型进行了总结,提出了一个新的面向工程抗震设计应用的形式统一的地震动空间相干函数模型,在此基础上推导出了多点地震反应谱和功率谱计算所需要的振型组合系数的解析表达式,避免了耗费时间的数值积分运算。本文模型与计算方法使多点地震激励下结构响应的计算时间减低至积分方法的1/20以下,使多点地震反应谱方法和多点地震功率谱方法在计算时间方面实用化。

关 键 词:多点地震动输入  相干函数  反应谱方法  功率谱方法  组合系数
文章编号:1000-1301(2007)01-0016-08
修稿时间:2006-05-312006-12-12

A spatial coherence model of seismic ground motion for design application
Wang Junjie,Chen Hu.A spatial coherence model of seismic ground motion for design application[J].Earthquake Engineering and Engineering Vibration,2007,27(1):16-23.
Authors:Wang Junjie  Chen Hu
Institution:Dept. of Bridge Engineering, Tongji University, Shanghai 200092, China
Abstract:The spatial coherence models of seismic ground motion are summarized,and a new model is proposed on the basis of previous models by a fitting procedure.The newly proposed model has a unified mathematical expression.Using the proposed spatial coherence model,the analytical expressions of combination coefficients are deduced for power spectrum methods and response spectrum methods under multi-support seismic excitations.The numerical results of an example bridge show that the analytical coefficients deduced in this paper is accurate enough to meet the seismic design's requirements.Meanwhile,the computation consumption for seismic response of structures under multi-support excitations is reduced to 1/20 lower than that of the integral methods.
Keywords:multi-support seismic excitation  coherence model  response spectrum method  power spectrum method  combination coefficient
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