【作者】 杜丽妹；

【导师】 祝兵；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 斜拉桥的出现为世界桥梁的发展注入了新的活力。斜拉桥以其超强的跨越能力和出色的自身优点日益向大跨度方向迈进。随着跨度的增大，有很多问题随之而来，其中桥跨结构的自振特性、抗震、抗风以及车辆荷载的冲击振动等动力学问题尤为突出。本文在收集有关斜拉桥及动力学资料的基础上，以徐州市和平路跨铁路站场斜拉桥为背景，使用ANSYS软件建立了空间有限元模型，实施了桥跨结构的自振特性分析；并分析了影响斜拉桥自振特性的参数；同时详细介绍了三维空间模型的各种简化方法和形式，并对几种形式的简化模型的自振特性进行了对比。在徐州市和平路跨铁路站场斜拉桥的瞬态动力分析中，采用Newmark积分法，考虑移动荷载速度的影响，对移动荷载作用下桥梁的动态响应进行了研究。模拟分析了移动荷载分别以5m／s、10m／s、15m／s及20m／s不同的速度通过桥面时的时间历程动力响应，并对桥跨结构在移动荷载作用下的动力放大系数作了较为详细的分析。斜拉桥动力学特性的研究为桥梁的抗震设计、抗风设计以及车辆振动分析等方面的内容提供理论基础。通过动力学分析能够更真实地揭示斜拉桥的桥跨结构在汽车车辆荷载作用下的受力与变形状况，并能够描述桥跨结构在地震作用和风荷载作用下的结构响应。更多还原

【Abstract】 The appearance of cable-stayed bridge injected new vigour into the world bridges. Now, cable-stayed bridges are being designed to the direction of long span because of its spanning ability and self advantages. With the overgrowth of the span, many problems have appeared. Moreover, the dynamic problems caused by wind, quake and moving load are severe in chief.In this thesis, on the basis of existing data collected of cable-stayed bridges and dynamics, taking the example of Xuzhou-heping cable-stayed bridge, 3-D finite element models of it with software ANSYS are established and its free-vibration is analyzed. The parameters which affect its free-vibration are also analyzed. This thesis also introduced some kinds of simplified methods of 3-D space model, and made comparison of the free-vibration property between them. During the transient dynamic analysis of Xuzhou-heping cable-stayed bridge, with the Newmark integral method, taking into account the influence of the moving load, the dynamic responses of the bridge are discussed under the effect of moving load. The time history responses of the structure under the moving load with the speed of 5m/s、10m/s、15m/s and 20m/s are analyzed, and the amplification coefficients of deflection and internal forces of the structure are intensively analyzed.The study of cable-stayed bridge dynamic property provides fundamental theory for aseismatic design、wind resistance and analysis of vehicle vibration. Through the analysis of dynamic, it can reveal more truly the structure stresses and deflection under the effect of vehicles. Then it can figure the responses of bridge structure when earthquake and wind loads affected.更多还原