The Finite Element Simulation Analysis On The Coupling Vibration Of Vehicle Load And Bridge Structure

Dynamic effects will happen on the bridge, when vehicles pass through the bridge with a certain speed, such as vibration and impact, etc. The vibration of bridge also has a reverse effect on vehicles moving. This interaction problem between vehicles and bridge is called vehicle-bridge coupled vibration. The upper structure vibration of bridge caused by the vehicles driving force may lead the structural component fatigue or reduction of the strength and stability. On the contrary, the vibration of the bridge structure as external incentives of the vehicles structure, impact on operational safety and comfort of vehicles directly.This text based on dynamic finite element analysis method of the structure and the boundary mark of wheel contact, divided the coupling system of vehicle-bridge into two sub-systems of vehicles and bridges. Summarize various factors of the vehicle vibration and classify the vehicle load that is the main vibration excitation of bridge, give the different types of vehicle dynamic load applied conditions. In addition, modeling different vehicle vibration, based on vehicle body vibration model, analyzes dynamic loads with different speed under different vehicle bridge flatness conditions.To the third bridge span of Taitou Ditch as a research object, established its finite element entity model by the second development of language APDL of large-scale finite element analysis software, ANSYS.Using transient dynamic analysis simulated the vehicle load under different conditions through the bridge structure by the use of the calculated vehicle load. By researching dynamic response characteristics of coupling system of vehicle-bridge, it gets some useful conclusions for the coupling vibration analysis system of vehicle-bridge to provide a scientific basis.