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以重庆市几江长江大桥为例,对公轨两用悬索桥风-车-桥耦合振动进行了研究。首先,应用弹性系统总势能不变的原理与“对号入座”的矩阵形成方法,分别建立了车辆、悬索桥与车-桥系统耦合振动的动力学方程。然后,对大桥桥址处的风速场进行了数值仿真,并利用风洞的数值模拟技术获得了列车、大桥主梁及列车-桥梁系统的三分力系数。在此基础上,计算和分析了几江长江大桥的风-车-桥耦合系统的振动响应。研究表明,当桥址处风速不大于25m/s时,列车的安全性和舒适性均满足我国列车在强风下运行管制的规程和标准,也说明了在该桥梁的设计中强风不会成为控制性的指标。
Taking Chongqing Jingjiang Changjiang River Bridge as an example, the wind-vehicle-bridge coupling vibration of the dual-purpose suspension bridge is studied. First of all, the dynamic equation of coupling vibration of vehicle, suspension bridge and vehicle-bridge system are established respectively by applying the principle of invariable total potential energy of elastic system and matrix formation of “condemnation”. Then, the numerical simulation of the wind speed field at the bridge site and the third-component coefficient of the train, bridge girder and train-bridge system are obtained by using the numerical simulation technology of wind tunnel. On this basis, the vibration response of the wind-vehicle-bridge coupling system of several Yangtze River bridges is calculated and analyzed. The research shows that the safety and comfort of the train meet the regulations and standards of the operation and control of the train in the strong wind when the wind speed at the bridge site is not more than 25m / s. It also shows that the strong wind will not become the control in the design of the bridge Sexual indicators.