Numerical Study On Coupling Vibration Of Vehicle-Bridge Interaction Based On Microscopic Traffic Load Modeling

The research on the coupling effect between vehicle and bridge has a history of hundreds of years.The single vehicle crossing the bridge in the theories and experiments has been mature,while the actual traffic flow is composed of complex traffic flow.It is necessary to study the coupling vibration response of vehicle-bridge under the action of traffic flow.With continuous explosive development of Chinese transportation industry,the traffic flow and load level of the road are constantly improving.It poses a great threat to the safety of the bridge structure.At present,the traffic load information of the bridge site environment can be obtained by various means.It is hard to deduce the distribution of vehicle load on the bridge.To develop the vehicle-bridge coupling vibration theory under random vehicle flow load simulation has become an important solution.In this paper,the basic theory of vehicle-bridge coupling is used to compile the program.The existing MSCA micro simulation method is used to carry out the theoretical analysis of random vehicle flow.A theoretical analysis method about the two is proposed,and the analysis method is explored.The following work is carried out:1?This paper systematically combines the basic theories of vehicle-bridge coupling,stochastic vehicle flow simulation research and stochastic vehicle-bridge coupling research at home and abroad,and summarizes the existing and latest research results;2.According to the existing classical theory of vehicle-bridge coupling,the framework of vehicle-bridge coupling analysis is formed,and a program is compiled for this framework.The program can realize the basic analysis of vehicle bridge coupling.The finite element software ANSYS is used to model the bridge structure and get the information of frequency and mode.The large-scale calculation software MATLAB is used to write the coupling program of vehicle and bridge,so that the complex iterative steps can realize the intelligent operation.The effectiveness and rationality of the program are verified by the classic calculation and engineering example of vehicle bridge coupling;3.Based on the new cellular automata such as MSCA,this paper combines the dynamics of cellular space,cellular state,neighborhood and rules.Then it introduces the functions and characteristics of the MSCA stochastic vehicle flow simulation program.It is considered that the response of pavement roughness and vehicle weight to the key section of bridge can not be ignored,and the influence of speed on different sections is slightly different.