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Effects of Damping on Vibration of Long Span Bridge under Moving Vehicles

ZHAO Fa-zhang~1, WANG Jie-jun~2 (1. Engineering Division of Gansu Provincial Communications Department, Lanzhou Gansu 730030, China;2. College of Civil Engineering, Hunan University, Changsha Hunan 410082, China)  
An element of vehicle-bridge coupling is established based on train-bridge interaction. A vehicle of train is modeled as an element possessing 4 axles and 10 degrees of freedom. Bridge is modeled as beam elements. Finite element formulas are educed from the equations of motion for whole train-bridge system. The random rail roughness samples are yielded using random numerical method and power spectral density function. Based on present method, a computing program is developed. As an example, the dynamic response and impact factors of a cable-stayed bridge are analysis with various damping parameters and various train speeds.
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