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Study on Vehicle-Bridge Interaction of Cable-stayed Bridge

Author: ZhuDingGuo
Tutor: FengXin
School: Dalian University of Technology
Course: Hydraulic Structure Engineering
Keywords: MATLAB vehicle-bridge interaction cable-stayed bridge road roughness dynamic response vehicle-bridge system
CLC: U441.3
Type: Master's thesis
Year: 2011
Downloads: 40
Quote: 0
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Abstract

In recent decades cable-stayed bridge has been widely promoted and applied because of its unique aesthetic appearance, large across capacity and other significant advantages. But with the dramatic collapse of Tacoma bridge in 1940, the dynamic response of bridge has arouse much attention. In the ensuing decades, people have done a lot of theoretical and experimental research in order to grasp and study factors that affect the dynamic response of bridge and the method of solving the dynamic response of the bridge. Load of moving vehicles act a important role in affecting the dynamic response. It will directly lead to increasing the maintenance cost and reducing the service time of the bridge.Various studies, of the dynamic response due to moving vehicles, have been conducted on ordinary bridge. However, they cannot be directly applied to cable supported bridges, as cable supported bridges are more complex structures consisting of various structural components with different properties. Therefore, it is necessary to study the dynamic response of cable-stayed bridge to moving vehicle loads.According to above problems, in this paper the first part introduces the main characteristics and development of the cable-stayed bridge and the history and current study on vehicle-bridge interaction. Then summarized and summed up the vehicle model,bridge model, numerical methods and other aspects of the main results. On this basis, author introduces the vehicle model, cable-stayed bridge model, method for solving the elastic supprot stiffness and the bridge deck roughness model. The finite difference method and mode superposition theory are used to solve the vehicle-bridge interaction equation.Solving the above process by using MATLAB software programming interations to achieve. In this paper, author introduces the interative process specific steps, the convergence conditions and interative flow. Then a simple support beam is used to study the dynamic response of the bridge to the moving force. The results show that the bridge program calculated the first 20 natural frequency, displacement, bending moment value coincide with the exact value. On this basis, author study the mode of the order taking, vehicle model, vehicle speed, the quality of the bridge itself, the bridge span and the flexural rigidity and other parameters affect on the dynamic response of the bridge. Finally, an example of a cable-stayed bridge has once again proven the validity and reliability of the program.Analyzing the vibration problem of the large span cable-stayed bridge with the MATLAB program in the project background of Yellow River Bridge. Then author studys the vehicle speed, vehicle weight, road grades and different vehicle model affect on dynamic response of the bridge and draws some useful conclusions for large span cable-stayed bridge vibration analysis.

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