一种空间相关多点地震动合成的实用模拟方法  

A Practical Simulation Method of Spatially Correlated Earthquake Ground Motions

作　　者：赵博[1] 石永久[2,3] 江洋[2,3] 王元清[2,3] 陈志华[1] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]清华大学结构工程与振动教育部重点实验室,北京100084 [3]清华大学土木工程系,北京100084

出　　处：《天津大学学报（自然科学与工程技术版）》2015年第8期717-722,共6页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金重点资助项目(51038006);高等学校博士学科点专项基金资助项目(20090002110045)

摘　　要：在严格的理论公式推导基础上,对多点地震动合成模拟方法加以简化改进.简化方法将行波效应与不相干效应分开考虑,完全避免了复数运算,可有效降低计算量.提出应根据《建筑抗震设计规范(GB50011—2010)》确定多点地震动所需参数,迭代调整多点地震动以满足规范反应谱的要求,提高所得时程的实用性.通过算例对多种现有多点地震动合成方法的准确性加以验证和分析,指出某些方法在没有严格理论推导的基础上人为改变合成公式,导致其所得多点地震动不满足相干性要求,应谨慎使用.Based on strict theoretical formula derivation,simulation method of spatially correlated earthquake ground motions is simplified and improved. In the simplified method,wave passage effect and incoherence effect are considered separately,and computational complexity is reduced since the complex calculation is avoided. It＇s pro-posed that parameters used in the simulation should be determined according to Code for Seismic Design of Build-ings（GB50011—2010）,and to enhance the method＇s practicality,ground motions should be adjusted to satisfy the response spectrum supplied in the code. Some existing simulation methods have been studied to verify their accuracy. Numerical analysis shows that ground motions gained from some of the existing methods which change the formula artificially without indispensable theoretical proving may not satisfy the coherence,and should be used with reserva-tion.

关 键 词：地震动模拟 空间相关 相干函数 行波效应 

分 类 号：P315.9[天文地球—地震学]