重型汽车荷载作用下简支梁桥的动力反应分析

基于结构动力学理论，视桥梁与车辆为一个相互作用的整体系统，建立了桥梁在移动车辆荷载作用下振动的计算模式。在分析中，汽车采用2轴模型，桥梁结构模拟为梁单元，统一列出车桥系统的动力方程，编制了计算程序。对实际预应力混凝土简支箱梁桥在重型汽车作用下的动力冲击效应进行了计算，并与轻型汽车荷载作用下产生的动力冲击系数进行了比较。

Analysis of Dynamic Responses of Simply Supported Girder Bridge under Heavy Moving Vehicles

Based on the theory of structural dynamics, a method is proposed for calculating vibration of simply supported girder bridge under moving vehicles by taking the vehicle and the bridge as an integrated system. In the method, the vehicle is simulated with a two-axle model, and the bridge with beam elements. Governing equations of the vehicle-bridge system are derived, and an associated computer program developed. Using the method, impact effects of an actual prestressed concrete simply supported box girder bridge with heavy vehicle are calculated. Finally, comparison between the impact coefficients of the bridge under weight and light vehicles is made.