基于车桥耦合振动的双层钢桁梁斜拉桥行车舒适度分析

The purpose of this paper is to investigate the driving comfort of vehicles on double-deck steel truss girder cable-stayed bridges, providing a basis for optimizing the design theory of such bridge structures. Based on the theory of vehicle-bridge coupled vibration, using ANSYS for numerical simulation, the vibration acceleration of the vehicle body was solved, and the ride comfort was evaluated by the standard" mechanical vibration and shock-evaluation of human exposure to whole body vibration" (ISO2631-1) root mean square multiplication method. The influences of single (double) layer loading, vehicle speed, vehicle mass, bridge surface roughness, vehicle spacing, and vehicle number on ride comfort were explored. The results show that the vibration intensity of the vehicle body is slightly reduced when the upper and lower decks are simultaneously loaded compared to single deck; the root mean square acceleration value of the vehicle body gradually increases when the mass of the vehicle body is smaller or the speed of the vehicle is higher; the bridge deck road condition has a greater impact on the vibration intensity of the vehicle body, and the vibration intensity of the vehicle body increases exponentially when the road condition is in the poorer class D and E. It can be concluded that the vibration intensity of the vehicle body is slightly lower when the upper and lower decks are simultaneously loaded than single deck. When double layers are loaded at the same time, the traveling comfort of the vehicle is slightly better than that of the single-layer through vehicle; maintaining the appropriate speed or increasing the mass of the vehicle can improve the traveling comfort of the driver and passenger; the traveling comfort of the vehicle is more sensitive to the bridge deck road condition, and the driver and passenger in the vehicle can not ride for a long time under the influence of the pavement grade when it is poor.