Analysis Of Train-Track-Bridge Coupling Vibration Based On Parallel Computing And Finite Element Method

Abstract:In the past ten years, the construction of high-speed railway has developed rapidly. With the faster speed of train and the greater proportion of bridge in whole railway, train-track-bridge dynamic interaction problem is getting people’s attention. Due to the wheel-rail relationship is very complex, the time step of transient dynamic analysis of coupled system is very small and the system modeling is increasingly complex and sophisticated to make the amount of computation huge. Therefore, it is necessary to improve the efficiency of modeling the train-track-bridge coupling vibration system and the speed of simulation analysis. This paper on the basis of previous research carries out the following research work:1. Establish train-track-bridge coupling vibration model and develop computing software TRBF-DYNAEstablish track-bridge model based on the finite element method and export the mass matrix, stiffness matrix, damping matrix of the track-bridge finite element model by finite element commercial software to improve the efficiency and accuracy of system modeling; Solve the wheel-rail contact space geometry relationship by improving the trace line method in order to consider the situation of wheel-rail multi-point contact; Propose a parallel computing strategy applied in the train-track-bridge coupling vibration so that the calculation speed is greatly increased; Develop the analysis software TRBF-DYNA of the train-track-bridge coupling vibration based on MATLAB, this software shows MATLAB the advantage of large matrix operation and excellent post-processing ability.2. Verify the results of the analysis of the softwareCompare the computing results of train dynamic response and rail-bridge dynamic response with the example of8train-10span high-speed railway32m simply-supported box girder model in the literature [2]. By comparing results, it indicats that the software is able to better reflect the train-track-bridge coupling vibration characteristics and meets the requirements of engineering applications.3. Analyze train-track-bridge coupling vibration of the96m steel box arch bridge by software TRBF-DYNATo the96m steel box arch bridge in the Beijing-Shanghai high speed railway, analyze train-track-bridge coupling vibration by software TRBF-DYNA; Research the law of vibration of mid-span points of the96m steel box arch bridge in train-track-bridge coupling vibration and research the law of train-track-bridge coupling vibration of the96m steel box arch bridge by the equivalent load method under the different situations including typical seismic excitation, different category seismic excitation and different intensity seismic excitation.