简支转连续梁桥车桥振动特性计算分析

Research of dynamic characteristic of simply supported-continuous bridge with vehicles

桥梁在车辆荷载作用下的振动,实质是桥梁和车辆两个动力系统的耦合振动。对公路上常见的4种跨径简支转连续连续箱梁桥进行车桥耦合振动动力特性的对比分析。同时详细分析桥面铺装、截面尺寸和行驶车速的变化等对该类桥型的车桥振动动力特性的影响,得到影响该类桥车桥耦合振动性能的关键因素,并提出设计建议。

In essence, vibration of bridge caused by vehicle is coupled vibration of two dynamic systems of vehicle-bridge. The author computes the vehicle-bridge vibrations of the common simply supported-continuous box beam bridges and analyses the dynamic capability resulted from bridge deck pavement and the change of cross-sections size and vehicle velocity. The paper finds out the main factors that affect the dynamic capability of bridge, and gives some advice about the design of this kind of bridge.