Dynamic interaction analysis of suspended monorail vehicle and bridge subject to crosswinds

摘要

This paper develops a fully coupled wind-vehicle-bridge (WVB) interaction model to eval-uate the dynamic performance and riding comfort of the suspended monorail vehicle-bridge system subject to turbulent crosswinds. The dynamic interactions between the vehicle and the bridge, the wind and the bridge, and the wind and the vehicle are consid-ered in the model. The suspended monorail vehicle is modeled as a mass-spring-damper system and the motion equations of the multi-body system are derived. Through generat-ing nonuniformity wind velocity fields consisting of various wind average velocities, an accurate approach to simulate the actual aerodynamic wind forces acting on the bridge and on moving vehicles is proposed. Further, a multi-span bridge is chosen as an example to illustrate the dynamic behaviors of the proposed WVB system. Results indicate that the turbulent crosswinds could have a great influence on the dynamic performance of the sus-pended monorail vehicle-bridge system, and it should be taken into account in the simu-lation of aerodynamic wind forces to guarantee the accurateness of vehicle vibration analysis. Besides, passengers could experience uncomfortable when vehicles pass through the bridge under strong turbulent crosswinds.