Effect of Curve Radius on Vehicle-Bridge Coupled Vibration of Continuous Curved Girder Bridge

Abstract

The purpose of this paper is to studies the coupling vibration response of a curved continuous box girder bridge on a ramp road and analyzes the influence of curvature radius on the coupling vibration of the bridge, which provides reference for the design. The general software ANSYS was used to simulate the bridge and the vehicle was simplified to a 16-degree-of-freedom model.A MATLAB program for solving the vehicle-bridge coupling equation of curved girder bridge were developed by using modal synthesis method and verified by dynamic load test considering the influence of bridge damping ratio and bridge deck irregularity. The results showed that the maximum displacement response increases with the decrease of curvature radius, and the maximum displacement response increases rapidly when curvature radius is less than 120 m.When the curvature radius is greater than 120 m, the displacement impact coefficient of curved girder bridge is smaller than that of straight girder bridge. With the decrease of curvature radius, the maximum impact coefficients of bending moment and torsion increase gradually, while the maximum impact coefficients of shear force change slightly. The corresponding maximum impact coefficients of internal force increase rapidly in the process of reducing the curvature radius from 120 m to 60 m.