Study Of Vehicle-Bridge Coupled Vibration Of 80M Arch Bridge Based On Multi-body Dynamics

With the increasing development of transportation and massive construction of high-speed railways in China, the velocity of trains has been accelerated constantly and larger areas have been covered by high-speed railways. As an essential part of the high-speed railway lines, high-speed railway bridge is featured by its smaller bridge rigidity and higher requirements of bridge alignment, thus making the research on vehicle-bridge coupling vibration practically significant.The thesis gives an introduction to the development of vehicle-bridge coupling theory and study on the theory of vehicle-bridge system is reviewed at various stages. Additionally, basic methods for establishment of bridge motion equation are presented in this thesis. By using finite-element software, a bridge model is built and Lanczos method is applied to the analysis of natural vibration frequency of bridge structure. Furthermore, knowledge on track irregularity, the simulation of which is carried out in self-compiling programs by way of trigonometric series and secondary filtering, is generally explained. The thesis also introduces the basics of Multi-body Dynamics and a refined model of CHR3 EMU is established with the assistance of multi-body dynamics software. Under the co-simulation of the softwares mentioned above, the dynamic coupling equation is reached with the coupling of bridge system and wheel system based on the wheel-rail contact relation. In this way the thesis generalizes the method for the co-simulation of finite-element software and multi-body dynamics software. Moreover, it is demonstrated in this thesis that co-simulation is advantageous for its high degree of refinement and fast calculation speed.Under the engineering background of an 80m railway arch bridge, this thesis compares given specifications with vehicle-bridge coupling vibration responses under the conditions respectively of CHR3 EMU and freight trains with differentiated velocities, reaching the conclusion that the 80m arch bridge is excellent in its dynamic performance, thus providing certain theoretical basis for the design of similar bridges in the future.