基于风车桥耦合振动分析的刚构拱桥优化设计

Wind-Vehicle-Bridge Coupling Dynamic Analysis of Rigid Frame Arch Bridge

以广州地铁14号线大跨度150 m刚构拱桥为例,建立风荷载作用下大跨度刚构拱桥的车桥耦合动力分析模型,并根据势能驻值原理及形成结构矩阵的"对号入座法则",采用计算机模拟的方法,计算与分析该桥列车通过时的桥梁动力响应和列车走行性,通过多方案比选,分别得出各桥梁方案的行车安全性及舒适性指标,最终提出优化设计方案。研究结果可为大跨度刚构拱桥的动力设计提供理论依据。

Taking the long span rigid frame arch bridge of Guangzhou rail transit as an example, a vehicle-bridge dynamic analysis model under wind load was established. This model was based on the principle of total potential energy with stationary value in an elastic system and the "set in right position" rule for the formulation of system matrixes. By using a computer simulation method, the bridge dynamic response and train running performance were calculated and analyzed in detail when trains run over the bridge to identify an optimum design scheme, and the results provided a theoretical basis for the dynamic design of a rigid frame arch bridge.