板桁组合桥梁车桥动力分析模型的等效简化方法

以上海轨道交通5号线跨越黄浦江的公路、轨道交通两用连续钢桁梁斜拉桥--闵浦二桥为工程背景,基于梁格法理论,建立大跨度板桁组合体系桥梁车辆-桥梁系统耦合振动分析模型的快速合理的等效简化方法,阐述了此类桥梁的动力特性以及各部分构件对桥梁动力特性的贡献。分析结果表明,等效前后的模型在动力特性方面具有良好的一致性,等效后的模型可用于车桥耦合振动分析。该等效简化方法为建立大跨度板桁组合体系桥梁车桥耦合振动分析的简化模型提供了一种简捷的方法。

Equivalent Simplification for Dynamic Analysis of Plate-truss Composite Vehicle-bridge

Taking No.2 Minpu Bridge-a large span continuous plate-truss composite cable-stayed bridge of Shanghai rail transit Line 5-as the engineering background,a fast and feasible model of bridge building used in the vehicle-bridge coupled vibration is analyzed through the theory of grillage method.Meanwhile,the dynamic characteristics of the continuous plate-truss composite cable-stayed bridge and the contribution of each component to the dynamic characteristic of the bridge are introduced.The results indicate that the equivalently simplified model is consistent with the accurate model in terms of the dynamic characteristics,and can be used for the vehicle-bridge coupled vibration analysis,which could provide an equivalent simplification for vehicle-bridge coupled vibration analysis of this type of bridges.