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Interaction and Multiscale Mechanics   Volume 3, Number 4, December 2010, pages 309-320
DOI: https://doi.org/10.12989/imm.2010.3.4.309
 
Nonlinear dynamic response analysis of a long-span suspension bridge under running train and turbulent wind
S.Q. Wang, H. Xia, W.W. Guo and N. Zhang

 
Abstract     [Buy Article]
    With taking the geometric nonlinearity of bridge structure into account, a framework is presented for predicting the dynamic responses of a long-span suspension bridge subjected to running train and turbulent wind. The nonlinear dynamic equations of the coupled train-bridge-wind system are established, and solved with the Newmark numerical integration and direct interactive method. The corresponding linear and nonlinear processes for solving the system equation are described, and the corresponding computer codes are written. The proposed framework is then applied to a schemed longspan suspension bridge with the main span of 1120 m. The whole histories of the train passing through the bridge under turbulent wind are simulated, and the dynamic responses of the bridge are obtained. The results demonstrate that the geometric nonlinearity does not influence the variation tendency of the bridge displacement histories, but the maximum responses will be changed obviously; the lateral displacement of bridge are more sensitive to the wind than the vertical ones; compared with wind velocity, train speed affects the vertical maximum responses a little more clearly.
 
Key Words
    geometric nonlinearity; suspension bridge; dynamic response; train; wind.
 
Address
S.Q. Wang, H. Xia, W.W. Guo and N. Zhang: School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
 

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