| Abstract:As the most competitive bridges, the super long span cable-stayed bridges are more and more favored in practices when the main span beyond1000meters compared with suspension bridges. However, with the innovations of structures and the increase of the span length, all kinds of uncertainties have been arisen obviously. This paper analyzed vehicle-bridge coupled vibration of super long span cable-stayed bridge under wind loads with following mainlined by National Natural Science Foundation project-"wind tunnel test research of aerodynamic characteristics and anti-capsizing performance of high-speed railway vehicle-bridge system(51178471)" and taking Hutong cable-stayed bridge as the subject of this study. The major work and the research results of thesis contain following the aspects:1. Firstly, this paper briefly introduced the development of super span cabled-stayed bridge and dynamic characteristics with the train running performance of railway bridges. Then the author of this thesis interpreted the necessity of study on coupled cibration of rail-cum-road cable-stayed bridge with a super span under wind loads.2. Secondly, on the basis of the characteristics of super long span cable-stayed bridges, the author of this thesis took Hutong cable-stayed bridge as the subject of this study, and the precise and micromech analysis model was established in this study.3. Thirdly, by calculating and analyzing the various running schemes of vehicle-bridge coupled vibration without wind, this paper obtained that both of the lateral and ratio stiffness of the bridge met the requirements. The bridge and trains had a good dynamic performance on the basis of the various running schemes.4. Fourthly, by calculating and analyzing the vehicle-bridge coupled vibration with strong wind, the results of this paper obtained a curve of wind and speed to meet the requirements of control procedures with train operation. It also provided a theoretical basis for super long span cable-stayed bridge operation. |
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