风荷载作用下大跨度桥梁的动力响应及行车安全性分析

根据桥梁结构动力学、车辆动力学、轮轨相互作用以及结构风振的基本原理，研究风、列车、桥梁构成的动力相互作用系统的振动机理。结合实桥的动力研究，建立风荷载作用下的列车和大跨度桥梁系统动力相互作用分析模型，研究桥梁在脉动风荷载和列车荷载同时作用下的振动特性，以及桥上列车受风荷载作用下运行的安全性和平稳性，从而得出风速、车速、桥型等多种因素对风-车-桥动力系统振动特性等影响的研究结论。主要研究内容如下。

Dynamic Responses of Long-Span Bridges and Running Safety of Trains under Wind Action

Based on the fundamental theories of bridge dynamics, vehicle dynamics, wheel/track interaction and wind-induced vibration of structures, the vibration mechanisms of the coupling interaction of cross winds, train vehicles and bridge structures are analyzed. A dynamic interaction model of longspan bridge and running train system under the wind action is established. The model is then applied to a real schemed long-span bridge to study the vibration characteristics of the bridge under the running trains and the wind action, the running safety and stability of the train vehicles moving through the bridge in the cross winds. As the result, some conclusions are drawn on the effects of wind speed, train speed, and bridge type on the vibration properties of the wind-train-bridge system. The following contents are covered in the researches.