Study on Vehicle-Bridge Interaction Effect of Urban Viaduct Under Multi-Disaster of Earthquake-Vehicle Collision

As the key node of transportation hub, the traffic congestion of urban viaduct is becoming more and more serious. Many vehicles are detained on the bridge, and the separation and collision between the vehicle and the bridge deck may endanger the safety of the driver and the bridge structure itself during the earthquake. In view of this phenomenon, a simplified vehicle-bridge interaction model of typical urban viaduct is established, in which the contact between the bridge deck and the vehicle tire is simulated by the Hertz model. Then the Runge–Kutta method is applied to solve the system dynamic equilibrium equations with different vehicle mass and frequency subjected to selected vertical ground motions. The influence of the vehicle mass and vertical frequency on the bridge dynamic response and impact force is analysed. The results show that the separation between the vehicle and the bridge mainly has an adverse impact on the vertical displacement response of the bridge, and it will greatly increase the impact force on the bridge deck.