结构抗震分析用地震动强度指标的研究  

Study on earthquake intensities for seismic analysis of structures

作　　者：叶列平[1] 马千里[1] 缪志伟[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《地震工程与工程振动》2009年第4期9-22,共14页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金重点项目(90815025)

摘　　要：随着基于性能结构抗震设计方法的推广应用,结构弹塑性时程分析逐渐成为主要的分析方法,但该方法所面临主要困难是缺乏对地震波选择的统一标准。由于影响地震动的参数很多,且不同参数对结构弹塑性地震响应的影响规律又十分复杂,因此能综合反映各种地震动参数对结构弹塑性地震响应影响的地震动强度指标成为基于性能结构抗震设计方法研究中的一个基本问题。本文参考已有学者的研究成果,总结归纳了现有主要的33个地震动强度指标,基于弹塑性SDOF和MD-OF系统的代表性地震响应指标,分析了不同地震动强度指标与不同结构地震响应指标之间的相关性,研究了不同地震动指标的适用范围和优缺点,给出了结构抗震分析用地震强度指标的建议。Assessing the elastoplastic performance of seismic structures is now playing a more and more important role in performance based seismic design. Nevertheless, it is difficult to use an appropriate earthquake intensity index for variant ground motions. Since the influence of different factors of ground motions upon elastoplastic performance of seismic structures is quite sophisticated, it is significantly important to choose a rational earthquake intensity index, which could give the comprehensive reflection of the variant characteristics of ground motions and the seismic responses of structures. Herein, the existing 33 earthquake intensity indices in the literatures are reviewed and summarized. The correlation between these earthquake intensity indices and the seismic response of structures is studied for elastoplastic SDOF and MDOF systems, and the applicability and characteristics of these earthquake intensity indices are also discussed. Based on the correlation analysis, a suggestion for selecting earthquake intensities is presented.

关 键 词：地震动强度指标 单自由度体系 多自由度体系 有效强震持时 相关系数 结构地震响应 

分 类 号：TU375[建筑科学—结构工程]