Abstract

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Title:: Influence of Auxiliary Piers on Seismic Behavior and Train Runability for Longspan Railway Suspension Bridge

Author(s):: LI Yong-le; WANG Yun-fei; ZHOU Yu; HE Ting-guo; School of Civil Engineering, Southwest Jiaotong University

Keywords:: auxiliary pier; railway suspension bridge; seismic response; trainbridge coupling vibration; dynamic response

Abstract:: To investigate the influence of auxiliary piers on the seismic behavior and train runability of longspan railway suspension bridge, a singleline railway suspension bridge with a main span 828 m was regarded as an example, and the finite element models were built. Meanwhile, a comparative research on the influence of the auxiliary piers on seismic response of railway suspension bridge was carried out by using response spectrum method and time history analysis method. The dynamic responses of the train and bridge were compared under different locations of the auxiliary piers by analyzing the trainbridge coupling vibration. The results show that vertical seismic response of the stiffening girder is significantly decreased after setting auxiliary piers, and the seismic response of the bridge towers is increased after setting auxiliary piers. The vertical rotation angle at girder ends, the vertical acceleration and load reducing ratio of the train are decreased after setting auxiliary piers. The vertical rotation angle at girder ends, the vertical acceleration and load reducing ratio of the train are decreased as the auxiliary piers moving to the girder ends, and the train responses are not sensitive to the changes of the auxiliary piers longitudinal position.[HQ]