钢筋混凝土加劲桁梁式悬索桥车桥耦合振动特性分析

摘要

通过建立车桥耦合振动模型，对一座钢筋混凝土加劲桁梁式悬索桥的车桥耦合振动特性进行了分析。现场试验和理论分析结果表明，钢筋混凝土桁架式悬索桥桥面加速度随车速、局部高差、轮胎刚度的增大而迅速增大，随路面等级的降低而增大，并存在一个最优悬架刚度，使得桥面加速度响应取得较小值；而位移放大系数仅对重车和低等级桥面敏感。研究结果为钢筋混凝土桁架式悬索桥的车辆通行及日常养护提供了参考。%Through establishing a coupled vibration model of the vehicle and bridge, the vehicle -bridge coupled vibration characteristics of stiffened reinforced concrete truss girder for suspension bridge was analyzed. The results of theory analysis and local test showed that the deck acceleration of stiffened reinforced concrete truss girder for suspension bridge increased as the increasing of the vehicle speed, local levd difference, and reduced with the decreasing of road degree. An optimal suspension stiffness corresponding to the small deck acceleration was existed. And the displacement amplification coefficient was only sensitive to the heavy truck and low grade bridge. The study in this paper provided a reference for the traffic management and daily maintenance of stiffened rein- forced concrete truss girder for suspension bridge.