Numerical Simulation Method And Application For The Dynamic Couple System Of The Light Rail Vehicle And The Cable-Stayed Bridge

The cable-stayed bridge has become one of the chief types for long span bridges due to its beautiful shape, reasonable bearing capacity, and long span ability. With the rapid development of science and technology, the bridges become more and more big and light. With faster and faster running, the increasing traffic density, and the increasing load, the dynamic interaction of the vehicle-bridge is receiving increasing attention. The numerical simulation method is used to calculate the dynamic response of the vehicle-bridge. Based on the virtual modeling and the parallel computing technologies, the dynamic couple system of the vehicle-bridge is studied. The dynamic couple system crashworthiness of the vehicle-bridge is also studied. The main contents include:The basic theory of the numerical simulation for the vehicle-bridge dynamic couple system is studied. Considering the geometric nonlinear of the long span cable-stayed bridge and the vehicle-bridge interaction, the geometric nonlinear theory and numerical method for the dynamic contact is studied. The Update Lagrange Formation is used to solve the geometric nonlinear equation. The penalty function method is used to deal with the wheel-rail interaction.The modeling technology of the refined finite element models of the long span cable-stayed bridge and light rail vehicle is studied. Based on the virtual modeling technology, the finite element model of the cable-stayed bridge is represented by the shell element, the solid element, the beam element, and the cable element. The vehicle model includes the wheel-set, the bogie, and the body, which are connect by the spring and damping. The three dimensional dynamic contact model of the wheel-rail is built. The two dummy models, standing and sitting, are set up to analyze the riding comfort.The parallel computing method of the vehicle-bridge dynamic couple system is studied in order to deal with so large model. Serial computer could not deal with this large-scale model. The parallel computing is necessary. Based on the character of the vehicle-bridge dynamic couple system and the structures of DAWNIING 4000A supercomputer located in Shanghai Supercomputer Center, the domain decomposition method based on the contact balance is proposed. Comparing with the recursive coordinated bisection method, the domain decomposition method based on the contact balance has higher speedup and parallel efficiency.The dynamic response of the vehicle-bridge couple system is analyzed. The initial state of long span cable-stayed bridge is determined firstly, which could provide the initial condition for the couple dynamic simulation of the vehicle-bridge. The influence of the velocity, two line, and brake on the stiffness, strength of the cable-stayed bridge and the vehicle safety and passenger comfort is analyzed, which can provide the detailed simulation results for the bridge design. The refined three-dimensional model and the plane beam model of the long span cable-stayed bridge are compared.The dynamic couple system crashworthiness of the vehicle-bridge is studied. The three dimensional numerical model of the ship is built. The light rail vehicle, the cable-stayed bridge, and the ship are analyzed as a whole system. The modeling method of the dynamic couple system of the vehicle-ship-bridge for vehicle running is put forward. The dynamic response of the cable-stayed bridge and the light rail vehicle under ship impact is analyzed, which can provide more reasonable reference for bridge crashworthiness design.