【作者】 张黎明；

【导师】 李小珍；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 近年来，随着公路交通和桥梁事业的发展，桥梁结构日益大跨、轻型和柔性化，大跨公路桥梁在重载、高速车辆荷载作用下的动力响应问题，也越来越受到桥梁研究者的关注。本课题针对极具代表性的公路桥型——大跨度连续刚构桥，研究其在移动车辆荷载作用下的车桥系统耦合振动响应，并分析各种车流工况对车桥系统耦合振动响应的影响。论文首先系统归纳和总结了目前公路桥梁与车辆耦合振动研究现状中车辆分析模型、桥梁分析模型、路面不平顺及数值计算方法等几个方面的主要成果。然后运用杆系有限元法建立了大跨连续刚构桥的动力分析模型和桥梁运动方程，并建立了7自由度两轴汽车的空间整车模型，运用达朗贝尔原理建立了车辆的运动方程。将整个车桥系统在车轮和桥梁接触处划分为车辆、桥梁两个子系统，通过车轮和桥梁接触点处位移协调条件和力的平衡条件建立了车-桥系统动力方程。在此理论基础上，采用分组迭代法编制了车桥系统耦合振动分析程序(DAVBS)，并通过动载试验验证了程序的可靠性。以柏溪金沙江特大桥为研究对象，运用DAVBS程序分析了大跨度连续刚构桥的车桥耦合振动问题。详细研究了车辆类型、车辆相向行驶、车速以及不同路况条件等因素对车桥耦合系统中桥梁动力响应的影响和不同路况条件、车速对车桥耦合系统中车辆动力响应的影响，得出了一些有益结论，为大跨度连续刚构桥的车桥系统耦合振动分析提供一定的科学依据。更多还原

【Abstract】 With the increase of highway transportation and the development of bridge construction, bridges are tending towards longer, lighter and more flexible. The dynamic responses of long-span highway bridges under high-speed and heavy vehicles have deserved general concerns by bridge researchers. The long-span continuous rigid frame bridge, a representative highway bridge, is regarded as the research object in the thesis. The dynamic responses of vehicle-bridge vibration system under moving vehicles are investigated. The influence of different vehicles conditions is disscused.The primary achievements at present are concluded roundly according to vehicle analysis model, bridge analysis model, surface roughness of road and numerical method of the reseach on vehicle-bridge interaction of highway bridges. Dynamic analytical model of long-span continuous rigid frame bridge and motion equation of bridge are established with the finite element method. The vehicle model used in this thesis is a 7 degree-of-freedom curving two wheels model. The motion equations of vehicle are derived using the D’Alembert principle. Vehicle-bridge vibration system can be divided into two subsystems at the interface of wheel and bridge, one for the bridge and the other for the vehicle. The vehicle-bridge coupling relationship, including the geometrical compatibility condition and the static equilibrium condition between vehicle and bridge, is established. Then, the governing equations of vehicle-bridge system are setup. A separated iterative method is used to work out three-dimensional coupling vibration program (DAVBS: Dynamic Analysis of Vehiche-Bridge System)。The reliability of DAVBS is proved using bridge dynamic tests.The dynamic responses of the long-span continuous rigid frame bridge are studied with Boxi Jinshajiang river highway bridge by DAVBS program. In the vehicle-bridge analysis for response, the effects of vehicle type, two-way direction, vehicle speed and road surface roughness are discussed. The influences of road surface roughness and vehicle speed on the dynamic responses of vehicles running on the bridge are investigated. The studied results can provide a certain scientific basis for dynamic analysis of the long-span continuous rigid frame bridge.更多还原