Techno Press

Structural Engineering and Mechanics   Volume 61, Number 3, February10 2017, pages 335-345
Free vibration analysis of continuous bridge under the vehicles
Guojin Tan,Wensheng Wang, Yubo Jiao and Zhigang Wei

Abstract     [Full Text]
    Free vibration analysis for continuous bridge under any number of vehicles is conducted in this paper. Calculation strategy for natural frequency and mode shape is proposed based on Euler-Bernoulli beam theory and numerical assembly method. Firstly, a half-car planar model is adopted; equations of motion and displacement functions for bridge and vehicle are established, respectively. Secondly, the undermined coefficient matrices for wheels, vehicles, intermediate support, left-end support and right-end support are derived. Then, the numerical assembly technique for conventional finite element method is adopted to construct the overall matrix of coefficients for whole system. Finally, natural frequencies and corresponding mode shapes are determined based on iterative method and overall matrix solution. Numerical simulation is presented to verify the effectiveness of the proposed method. The results reveal that the solutions of present method are exact ones. Natural frequencies and associate modal shapes of continuous bridge under different conditions of vehicles are investigated. The influences of vehicle parameters on natural frequencies are also demonstrated.
Key Words
    continuous bridge; bridge-vehicle interaction; free vibration; numerical assembly method; numerical simulation
Guojin Tan,Wensheng Wang, Yubo Jiao and Zhigang Wei : College of Transportation, Jilin University, Renmin Street 5988, Changchun 130022, China

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