场地卓越周期与结构基本周期关系研究  

Study on the relation of predominant period of site and natural period of structure

作　　者：蔡元奇[1] 韩芳[1] 朱以文[1] 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《地震工程与工程振动》2004年第4期70-74,共5页Earthquake Engineering and Engineering Dynamics

基　　金：国家电力公司科研基金项目(KJ00-03-26-01)

摘　　要：本文从抗震概念设计的背景出发,认为抗震设计应充分考虑结构与地基耦合作用的影响,其中结构和场地的频率关系是十分重要的。根据地震作用是瞬态冲击的特性,在理论上和数值上分析了结构自振周期与场地卓越周期在不同比值情况下对结构抗震性能的影响,提出两个周期之间存在最优比值T=3Tg×β。当结构与场地频率满足最优比值时,结构的抗震性能最佳,它可以作为抗震概念设计中的参考准则。此外,进行了各种框架结构在地震作用下的时程分析,验证了此最优比值的合理性。This paper demonstrates that the coupling effect on structure and ground should be considered thoroughly when involving with anti-seismic concept design. The frequency relation between structure and ground is important. Considering the impact characteristic of earthquake, this paper analyses the effects on the anti-seismic property of the structure theoretically and numerically on the basis of different ratios of natural period to predominant period. The result proves that there exists a most advantageous ratio T=3T_ g ×β which is more beneficial to the anti-seismic property of the structure. In addition, various examples are given to validate the conclusion by the transient dynamic analysis.

关 键 词：抗震概念设计 耦合作用 卓越周期 振型参与因子 

分 类 号：P315.95[天文地球—地震学]