曲线桥多维地震时程分析主方向研究  

RESEARCH ON CRITICAL ANGLE OF CURVED BRIDGE IN MULTI-DIMENSIONAL EARTHQUAKE TIME HISTORY ANALYSIS

作　　者：全伟[1] 李宏男[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,大连116024

出　　处：《振动与冲击》2008年第8期20-24,共5页Journal of Vibration and Shock

基　　金：教育部长江学者创新团队发展计划(IRP0518);国家杰出青年基金(50025823)

摘　　要：研究曲线桥多维地震作用下利用时程分析法时的主方向问题。首先利用基于小波变换的拟和规范反应谱的多维地震动模拟算法合成多维地震动,然后基于多维地震动作用下的结构动力方程,推导了时程分析法时求解地震激励主方向的公式,并对比计算分析了SRSS法,百分比准则等组合方法的正确性。推导的公式简单易行,可方便求得时程分析时,单维或者多维地震激励的最不利方向。对于曲线桥这种桥型,应该考虑地震动的多维性,对不同反应量,对应着不同地震激励的主方向,实际分析时,应该同时输入多维地震动,并求得最不利角度才能保证结构的抗震要求。The method to determine the critical angle of curved bridges in time history analysis was investigated. A wavelet-based procedure was presented to generate a multi-dimensional accelerogram whose response spectrum is compatible with the three-dimensional target spectrum. The critical angle for the bridge type was studied, and a method to decide the angle was proposed. The orthogonal effects and the correctness of the assembled approaches in time history analysis, such as the 100/30, 100/40 percentage rules and the SRSS rules were also examined. The results show that multidismensional earthquake should be considered in the seismic response of this type of bridge, and the critical angle can be calculated efficiently using the method proposed. For time history analysis, none of the assembled approaches is able to provide conservative results. And the paired acceleration time histories along the critical angel should be used in the analysis.

关 键 词：曲线桥 时程分析法 多维 主方向 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]