Behavior of composite rigid frame bridge under bi-directional seismic excitations

查看全文 作　　者：Xiaogang [1]Liu;Jiansheng [1]Fan;Jianguo [1]Nie;Guo [1]Li 机构地区：[1]Department of Civil Engineering,Tsinghua University 出　　处：《Journal of Traffic and Transportation Engineering(English Edition)》索引2014年第1卷第1期,共10页 基　　金：the financial support provided by the National Science and Technology Support Program(No.2011BAJ09B02);the National Natural Science Foundation of China(No.51138007,51222810) 摘　　要：Pushover analysis and time history analysis are conducted to explore the bi-directional seismic behavior of composite steel-concrete rigid frame bridge,which is composed of RC piers and steel-concrete composite girders.Both longitudinal and transverse directions excitations are investigated using OpenSees.Firstly,the applicability of pushover analysis based on the fundamental mode is discussed.Secondly,an improved pushover analysis method considering the contribution of higher modes is proposed,and the applicability on composite rigid frame bridges under bi-directional earthquake is verified.Based on this method,an approach to predict the displacement responses of composite rigid frame bridge under random bi-directional seismic excitations by revising the elasto-plastic demand curve is also proposed.It is observed that the developed method yield a good estimate on the responses of composite rigid frame bridges under bi-directional seismic excitations. 关 键 词：连续刚构桥 地震激励 复合 钢筋混凝土桥墩 弹塑性分析 行为 混凝土组合梁 推倒分析