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| Analysis of Vehicle-bridge Coupled Vibration due to Track Irregularities |
| WANG Gui-chun1, PAN Jia-ying2 |
| 1.Zhengzhou University, Zhengzhou, Henan 450001, China; 2.Railway Building Institute, China Academy of Railway Science, Beijing 100081, China |
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Abstract Research purposes: Track irregularity is usually one of the most important factors that induce vehicle-bridge coupled vibration. Studying the laws of vehicle-bridge coupled vibration due to track irregularity can better provide theoretical basis for precise design of railway bridges.
Research methods: Track random irregularity functions in time domain are established on the basis of H. Hamid's Power Spectrum Density (PSD) functions of track irregularities. The track irregularity sample functions are taken as exciting source to solve vibration differential equations of vehicle-bridge coupled vibration. This paper also studies the dynamic characteristics of railway bridges under moving vehicles.
Research results: The Hongshui River railway cable-stayed bridge in Guangxi is taken as example to calculate the dynamic response of the bridge under train passage, and the curves of time history of displacement at midpoint of bridge main span for different vehicle velocities and irregularity samples.
Research conclusions: The dynamic response of the bridge due to passing trains is related to the speed of train and the change of track irregularity samples, and it is of random characteristics. For the Hongshui River railway cable-stayed bridge, the speed at which the largest lateral displacements occur falls between 75 km/h and 95 km/h.
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Received: 19 June 2006
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2006, Vol. 23 
