长周期地震动的场地效应与大跨桥梁结构的动力响应分析  

Site Effect of Long-Period Ground Motion and Dynamic Analysis of Long-Span Bridge Structures

作　　者：臧明明[1] 陈清军[1] 

机构地区：[1]同济大学土木工程学院防灾国家重点实验室,上海200092

出　　处：《结构工程师》2010年第1期118-125,共8页Structural Engineers

基　　金：国家自然科学基金资助(50978198;90915011)

摘　　要：对长周期地震动作用下大跨桥梁结构的地震反应作了研究分析。首先,选用两条典型的基岩长周期地震波,进行频谱特性分析;然后,以基岩长周期地震波作为输入,对一场地土层进行了长周期地震反应分析,获得其地表面的地震动响应时程,并以此地震动时程作为输入,对某大跨度桥梁结构进行了动力响应分析。结果表明,长周期地震波作用下桥梁结构基底反力及主要截面内力的最大值均大于普通地震波作用下的结果,地震波行波输入对桥梁结构主要截面内力产生较大的影响。At present ,there are not many research projects about long-period seismic responses for long-span bridge structures subjected to long-period ground motion. In this paper, two typical bedrock seismic waves were selected to analyze their spectrum characteristics. Then using those two waves as input, the long-period seismic response of one site soil was analysed and its surface seismic response history was calculated. In the end, this seismic history was taken as input to analyze dynamic response of one long-span bridge structure. It was shown that the maximum reaction forces and the main-section force of the bridge are bigger under long-period seismic waves than that under general seismic waves, and the results indicate that the main-section force of long-span bridge will be greatly affected by the excitation of traveling waves.

关 键 词：基岩长周期地震波 场地效应 大跨桥梁结构 长周期地震反应分析 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]