质量布置形式对曲线桥地震反应的影响  

Influence of mass arrangement pattern on seismic response of curved bridge

作　　者：吴桐[1] 孙全胜[1] Walter Yang 

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]佐治亚理工学院土木与环境工程学院,美国亚特兰大30332

出　　处：《世界地震工程》2014年第2期99-106,共8页World Earthquake Engineering

基　　金：Enhancements to Caltrans Bridge Fragility Relationships for Regional Seismic Risk Assessment in California

摘　　要：转动惯量决定了曲线桥梁转动方向的振型,对曲线桥的地震反应影响很大。推导了曲线桥梁主梁绕不同转轴转动惯量的计算方法,并利用地震工程分析平台OpenSees研究了不同质量布置形式对曲线桥主梁、桥墩地震反应的影响。研究结果显示,在曲线桥的动力建模过程中,只进行平动质量的输入会极大影响桥墩计算的准确性;主梁绕纵轴转动的转动惯量在结构动力分析中十分重要,不可忽略。Moment of inertia decides the rotational mode shape of curved bridge, and has a strong impact on seismic response of curved bridge. The method for calculating moment of inertia of curved bridge＇ s girder about different axes was deduced. And then the impact of different mass arrangements on seismic response of girder and columns in curved bridge was researched using OpenSees program. The research results show that：in the modelling ofcurved bridge, the accuracy of seismic response of piers will be reduced greatlyy if just computing three translation-al mass. The moment of inertia of girder which revolve around longitudinal axis is rery important in analysis and cannot be ignored

关 键 词：转动惯量 OPENSEES 时程分析 曲线桥 弯矩曲率 

分 类 号：U443.35[建筑科学—桥梁与隧道工程]