Influence of Structure Quasi-static Components on Dynamic Response of Train-Bridge System during Earthquakes
DU Xian-ting1, QIAO Hong1, XIA He1, Wang Shao-qin2, LI Xiao1
1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
2. School of Science, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
In regions prone to earthquakes, the possibility of trains running on bridges when an earthquake occurs is getting larger. However, the influence of structure quasi-static components on seismic response of train-bridge system has not been studied sufficiently. In this paper, the bridge subsystem and the train subsystem are simplified to simply supported beam with uniform cross-section and a moving vehicle with a wheel ( unsprung-mass), a spring, a damper and a sprung-mass, respectively. Then the motion equations of train-bridge coupling system subjected to multi-support seismic excitations can be obtained. The influence of structure quasi-static components can be expressed precisely by decomposing the dynamic response of the bridge subsystem and then the solving procedure is proposed. A moving vehicle with a wheel ( unsprung-mass), a spring, a damper and a sprung-mass passing through a 32m simply supported beam is taken as a case study, in which the influence rule of structure quasi-static components is analyzed. The results show: 1) in the dynamic analysis of train-bridge system subjected to earthquake actions considering the influence of quasi-static components, it is necessary to input the displacement, velocity as well as acceleration time history of ground motion; 2) compared with the bridge subsystem, quasi-static components have more influence on the train subsystem, which is beyond 16% and sensitive to the train speed; 3) neglecting the quasi-static components may lead to large deviation responses of the coupled system, which differs greatly from the aseismatic analysis of bridges.
杜宪亭1,乔宏1,夏禾1,王少钦2, 李啸1. 地震作用下结构拟静力分量对车桥系统动力响应的影响分析[J]. 振动与冲击, 2016, 35(16): 6-11.
DU Xian-ting1, QIAO Hong1, XIA He1, Wang Shao-qin2, LI Xiao1. Influence of Structure Quasi-static Components on Dynamic Response of Train-Bridge System during Earthquakes. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(16): 6-11.
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