A Refined Analysis On Vehicle-bridge Coupling Vibration Of Steel Box Girder Bridge

When the vehicle passes through the bridge with certain speed, it will cause the bridge vibration; conversely, the bridge also has an effect on vehicle, this interaction and mutual restriction between vehicle and bridge are called vehicle-bridge coupled vibration. The analysis of this problem is not only plays an important role in the design,maintenance and management of bridges, but also help to optimize the vehicle design and to meet the requirement for comfortableness. Therefore, it is essential to carry out the qualitative and quantitative analysis of this coupled vibration.Combined with domestic and foreign latest research results, a refined finite element analysis is given to vehicle-bridge coupling vibration on steel box girder bridge, main tasks are as follows:(1) As steel and brick element may be used in refined analysis, it will lead to numerous nodes, it is necessary for this mesh to renumber optimization. By comparison of several optimization methods, rectangular optimization method is better.(2) In order to verify the accuracy of finite element analysis, the vibration of simply supported beam bridge under moving loads is analyzed theoretically, and the original theoretical methods is improved. Compared the results from theoretical methods with that from finite element program and commercial finite element program (Marc ), approve our finite element methods and procedures on vehicle-bridge vibration are correct.(3) This paper develops the finite element method of coupled vibration, combined with a moving load, moving mass and the vehicle-suspension system, detailed vehicle model is proved necessarily.(4) Finally,two different models of a steel bridge is proposed by shell element and grillage, the vehicle uses the body - suspension model and consider the impact of pavement roughness, carry on the refined finite element analysis on vehicle-bridge coupled vibration. To analyze the bridge deflection and acceleration response, shell element is valid to reflect the actual dynamic response.