Analysis on Coupled Vibration of Vehicle and Curved Continuous Beam Bridge Based on FEM

The vehicle-bridge coupled vibration when automobile crossing the curved continuous beam bridge was calculated.The vehicle and curved continuous beam bridge were taken as two separated subsystems,each vibration equations set was derived by using the generalized virtual work principle and finite element method.Through coupling vehicle vibration and bridge vibration by compatibility equations of displacement and the contact equations of vehicle-bridge interaction,the vehicle-bridge coupled vibration equations were set up,and the computational method of coupled vibration of vehicle and curved continuous beam bridge was proposed by using the common used ANSYS software.The numerical analysis example shows that higher accuracy and more reliable numerical result can be achieved by utilizing this method via only three times iterations.In the case of flat deck,the impact factor is in fairly good agreement with the result calculated by fundamental frequency given by code;while in the case of the bridge deck is C grade pavement,the difference is greater.This shows that the impact factor of a curved continuous beam bridge may be unsafe in certain conditions.The method provides a reliable numerical analysis way for dynamic performance evaluation of curved continuous beam bridges.