INVESTIGATION OF EFFECTIVE PARAMETERS ON DYNAMIC RESPONSE OF COMPOSITE BRIDGE UNDER MOVING VEHICLE

In this paper, the effects of various parameters influencing on the dynamic response of composite bridge are investigated by FEM method. Herein composite bridge with one, two and four degree of freedom for vehicle has been studied. The corresponding Equations of motion are integrated numerically by applying the Newmark's method. The models were verified by analytical and numerical solutions available for isotropic bridge. The speed of the vehicle, mass ratio, bridge damping on the dynamic deflection and acceleration and effect of composite bridge layup have been analyzed. Bridge damping can significantly decrease the acceleration of the structure, and it is true particularly for higher values of the speed parameters. Dynamic deflection is not influenced by damping changes; however, it also reduces with the increase of the damping ratio. Bridge damping has negligible effect on the vehicle acceleration. The bridge acceleration generally increases with the mass parameter. The vehicle acceleration increases much steeply and reaches much higher values for large mass parameters.