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

作　　者：Xiaogang Liu Jiansheng Fan Jianguo Nie Guo Li 

机构地区：[1]Department of Civil Engineering,Tsinghua University

出　　处：《Journal of Traffic and Transportation Engineering(English Edition)》2014年第1期62-71,共10页交通运输工程学报（英文版）

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 funda- mental 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 hi-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.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 funda- mental 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 hi-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：composite rigid frame bridge bi-directional Seismic excitation pushover analysis time history analysi 

分 类 号：U448.23[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]