DYNAMIC RESPONSE OF STEEL DECK ASPHALT PAVEMENT CONSIDERING VEHICLE-BRIDGE COUPLING EFFECT

In order to study the dynamic response of asphalt pavement of steel deck, a dynamics model with vehicle-bridge deck asphalt pavement -steel bridge coupling effect is established. In the model, the vehicle body is regarded as a rigid body moving with a constant speed, and the vehicle suspension and wheels are composed of springs and damping devices. The asphalt pavement of bridge deck and steel plate are treated as double-layer continuous viscoelastic sheet. The unevenness of the pavement surface is the source of additional excitation, and the point contact model is used to connect the asphalt pavement and the vehicle. Wilson-θ method is used to solve the system equations. On this basis, the corresponding calculation program is developed with Fortran language. The reliability and accuracy of the program are verified according to the measured data. The results show that the dynamic effects of the moving vehicle are remarkable. With the increase of rear axis loads, the peak strain of pavement surface and the maximum shear stress between bridge deck pavement and steel plate display a linear increase. With the increase of moving speed, the peak strain of pavement surface and the maximum shear stress between bridge deck pavement and steel plate fluctuate within a range, but both of them reach the maximum values at 60 km/h speed. Bridge span and bridge width show a significant effect on the peak strain of pavement surface and the maximum shear stress between bridge deck pavement and steel plate, especially the bridge span.