考虑行波效应大跨度连续梁桥地震响应分析  

Seismic response analysis of large span continuous beam bridge considering traveling wave effect

作　　者：张彬[1] 张海[1] 苏鹏[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000

出　　处：《辽宁工程技术大学学报（自然科学版）》2015年第8期936-940,共5页Journal of Liaoning Technical University (Natural Science)

基　　金：国家安监总局项目(05 05 079);辽宁省教育厅项目(1.2011048)

摘　　要：为解决大跨度桥梁结构的抗震性能问题,以六库怒江大桥为研究背景,采用MIDAS/CIVIL有限元软件,建立三跨混凝土连续梁桥有限元模型,在考虑地震动的行波效应情况下,对大跨度连续梁桥进行地震反应分析,得出相应桥梁结构的地震响应,并对其结果进行对比分析.结果表明:在采用不同的视波速情况下,大跨度桥梁结构的地震响应存在着很大的不同,当地震动的视波速相对越小,结构的响应的延迟现象就越明显,伴随着视波速的增加,延迟效应逐渐好转,桥梁结构的内力和位移随着视波速大致规律是先减小后增大,最后趋于平缓.This paper took the local Nu River bridge as the research background, used the MIDAS/CIVIL finite element software, and established the three span prestressed concrete continuous beam bridge finite element model. The apparent wave velocity obtained in different situations and the seismic response of long span bridge structures are very different. The local vibration of apparent wave velocity is relatively smaller, and the delayed response of the structure is more obvious. Accompanied by an increase of the apparent velocity, delay effect is gradually improved Under the condition of considering traveling wave effect of seismic, the large span continuous beam bridge seismic response was analyzed, the seismic response of the bridge structure was obtained, and the results were comparatively analyzed.. The more or less regular pattern of the internal force and displacement of bridge structure with the apparent wave velocity is that it is first decreased and then increased, and finally flattened.

关 键 词：有限元模型 大跨度桥梁 抗震 视波速 行波效应 地震动 

分 类 号：P315.966[天文地球—地震学]