多点随机激励下自锚式悬索桥的地震响应  

Seismic Responses of Self-anchored Suspension Bridges Subjected to Multi-support Stochastic Excitations

作　　者：刘春城[1] 石磊[2] 刘向阳[1] 郑传杰[1] 

机构地区：[1]东北电力大学,吉林132012 [2]大连理工大学桥梁工程研究所

出　　处：《东北林业大学学报》2008年第12期51-53,共3页Journal of Northeast Forestry University

基　　金：交通部西部交通建设科技项目(200631882350);吉林省教育厅科技计划项目(200627)

摘　　要：通过引入均匀调制演变函数,来考虑地震激励幅值的非平稳性,同时应用虚拟激励法进行求解。由于该方法自动计算参振振型的互相关项和激励的互相关项,其计算结果精确高效。对一座自锚式混凝土悬索桥结构进行了地震反应分析。结果表明,地震动的非平稳行波效应和非平稳相干效应对自锚式悬索桥结构的地震反应产生很大的影响。The uniformly modulated evolutionary function is introduced into the seismic response analysis of a self-anchored suspension bridge subjected to the non-stationary seismic excitation amplitudes. The pseudo excitation method is utilized to solve this problem. High computation precise was obtained due to the correlative items between participant modes and between excitations computed by the pseudo excitation method automatically. Seismic response of a concrete self-anchored suspension bridge is analyzed. Result shows that wave passage effect and coherence loss have significant influence on the seismic peak response of self-anchored suspension bridge.

关 键 词：均匀调制 非平稳 随机激励 自锚式悬索桥 地震响应 功率谱 

分 类 号：TU445.5[建筑科学—岩土工程]