SH波作用下层状土层随机波动分析  

RANDOM WAVE ANALYSIS OF LAYERED SOIL SITES UNDER SH WAVE EXCITATION

作　　者：潘旦光[1] 楼梦麟[2] 董聪[1] 

机构地区：[1]清华大学土木工程系,北京100084 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《工程力学》2005年第5期20-25,共6页Engineering Mechanics

基　　金：国家自然科学基金(50279031);863计划(2002AA615110)资助项目

摘　　要：提出了SH波作用下层状土层地震反应分析的随机波动分析方法。在这一方法中,将波动理论和随机振动理论结合起来,求解波动方程和土层地震反应的统计参数,可以准确而又方便地综合考虑地震波斜入射及基岩弹性刚度对土层地震反应的影响。随后进一步通过算例分析,讨论了基岩弹性刚度及SH波入射角度对半空间上均匀土层地震反应的影响及其规律,为工程中进行复杂土层的地震反应分析提供参考。A new analysis technique, called random wave analysis method, is developed for the random seismic response analysis of layered soil sites under SH wave excitation. In this method, the random vibration analysis method is combined with wave theory to solve the wave equation and to obtain the seismic responses of the layered soil sites. The effects of incident angle of SH wave and elastic rock on the seismic responses of layered soil sites are considered accurately and conveniently. The influences of elastic stiffness of rock and incident angle of SH wave on the seismic responses of homogeneous soil layer on half-space are discussed through numerical results of several examples. The conclusions reached in this paper can be used as reference for seismic responses analysis of complicated soil sites in engineering practice.

关 键 词：地震反应 层状土层 随机波动分析 波动理论 随机振动 

分 类 号：TU435[建筑科学—岩土工程]