Vertical Earthquake Shaking Induced Vehicle-Bridge Coupling Behavior of Urban Viaducts

Abstract:

This paper established a simplified vehicle-bridge coupling model of urban viaduct via nonlinear contact element to simulate the contact relationship between vehicle tires and bridge deck， and to investigate the influence of vehicle mass， frequency， ground motion spectrum characteristics and peak acceleration on the dynamic response of vehicle-bridge system subjected to selected vertical ground motions with wide-range of spectral characteristics. The results show that the vehicle mass， vehicle vibration frequency， and ground motion spectrum have a great influence on the vehicle bridge coupling system. The vehicle bridge separation phenomenon occurs in 221 of 1 866 cases. Vehicle bridge separation is unfavorable to the displacement response of the bridge in most cases， and also greatly increases the impact force on the bridge deck. Statistically， the average value of peak acceleration of vehicle bridge separation increases with the increase of vehicle mass， decreases with the increase of vehicle frequency， and decreases with the increase of average period of ground motion.