空间多点人工地震动幅值收敛性研究  

The amplitude convergence study of artificial ground motions about special multi-points

作　　者：吴祚菊[1] 张建经[1] 王志佳[1] 吴兴序[1] 汪明元[2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州310014

出　　处：《振动工程学报》2015年第4期610-617,共8页Journal of Vibration Engineering

基　　金：国家自然基金重大研究计划(41030742);国防基础科研计划(B0220133003);中国水电顾问集团公司重大科技项目资助:海上风电工程地质勘测关键技术研究(GW-KJ-2011-18)

摘　　要：在空间相关性人工地震动生成中,计算的繁杂和局部场地收敛性与幅值收敛性之间存在的矛盾,是时域合成法中的两大主要问题。为了简化计算,同步实现局部场地及地震动幅值的双重收敛性,在对相位角分布进行深入研究的基础上,构建了空间多点人工地震动幅值收敛因子,并采用虚实分离法来分解功率谱矩阵。结果表明,该方法生成的多点人工地震动计算快速,且幅值稳定收敛。In the generation of spatial correlation ground motion,there are two major problems in the time domain method,the complexity of calculation and the contradiction between local convergence and amplitude convergence.In order to simplify the calculation and realize the double convergence,on the foundation of further research about initial random phases,an amplitude convergence factor had been introduced to this paper for the first time.In addition to this,a new method had been introduced to decompose the power spectrum matrix,which separated the imaginary part from the real component.The results show that,with this method,the calculation is faster and the amplitude convergence is stable.

关 键 词：地震动合成 空间相关 幅值收敛性 相位角分布 虚实分离法 

分 类 号：P315.9[天文地球—地震学]