拱桥在竖向地震波输入下的行波共振现象  

The resonant effect of traveling wave for the arch bridge under vertical seismic excitation

作　　者：楼梦麟[1] 高珊[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《世界地震工程》2009年第4期7-11,共5页World Earthquake Engineering

基　　金：科技部国家重点实验室基础研究项目(SLDRCE08-A-07)

摘　　要：以某大跨公路拱桥为例讨论了行波作用对拱桥地震反应的影响机理。采用有限元程序计算分析了该拱桥在竖向地震动行波输入和一致输入下的动力反应,通过结果对比反映出行波地震反应并不简单随波速单调变化的现象。经过分析进一步提出了行波共振的概念,阐述了行波共振效应的产生机理。数值分析结果表明了考虑行波效应对大跨拱桥地震反应分析的重要性。Taken a long-span arch bridge as an example, the influence mechanism of the seismic response of the arch bridge under the excitation of traveling wave is discussed in this article. The seismic response of the arch bridge under the vertical direction unique support excitation and traveling wave excitation are calculated by the finite element procedure respectively. The comparison of the results describes that the seismic response under traveling wave excitation does not linearly change with the seismic wave velocity. Through some further analysis, a new concept of the resonance of traveling wave is proposed, and the mechanism of the resonant effect of traveling wave is expatiated. The numerical results show the important effect of the traveling wave excitation on the seismic response of the long-span arch bridges.

关 键 词：一致输入 行波输入 行波共振效应 行波共振频率 

分 类 号：P315.96[天文地球—地震学]