Sensitivity of structural stiffness parameters of long-span steel truss cable-stayed railway bridge

Aiming at the design of a long-span cable-stayed railway bridge, the effects of the stiffnesses of girder, cables and auxiliary piers on the bridge structure and the runing performance of vehicles were analyzed. It is shown by the analysis results that the increase of truss width can significantly increase the lateral bending stiffness of the bridge, but has a limited impact on train running performance. Increasing the truss height or cable cross section area can notably increase the fundamental vertical bending frequency and reduce the response of vehicle-bridge systems. Local bridge deck system contributes slightly to the overall bridge stiffness and has a limited impact on the vehicle response. Auxiliary pier can improve the vertical stiffness of the bridge, reduce the vehicle vertical acceleration and the vertical rotation angle at girder ends. ©, 2015, Chinese Vibration Engineering Society. All right reserved.