高速列车对建筑结构的振动影响

【作者】 周涛；

【导师】 郭向荣；

【作者基本信息】 中南大学 ， 桥梁与隧道工程， 2009， 硕士

【摘要】 对高架车站而言,由于高架桥与车站主体结构连为一个有机整体,列车通过高架桥时所引起的振动有可能导致整个建筑结构无法正常使用或引起使用者和旅客的不安甚至恐慌,因此非常有必要对高速列车通过高架车站时对建筑结构的振动影响规律进行深入研究。本文以新广州站工程实例为研究对象,对高速列车作用下建筑结构的振动问题进行了探讨,主要研究工作如下:(1)针对新广州站出现的“车辆-桥梁-结构”一体化复杂系统的振动响应评价问题,提出了将“车-桥”振动的评价和建在桥梁上的结构物的振动评价分开进行的实施方案。并在综合考虑我国的实际情况和国际上的一些实例的基础上,分别选取了合适的振动评价标准。(2)根据列车桥梁时变系统振动分析理论,对新广州站中支撑站房结构的连续梁桥结构自身做了单独的车桥耦合振动分析,得出站房结构的支撑基础有足够的安全可靠性。(3)提出了将整个“车辆-桥梁-结构”系统的动力学相互作用分析分解为成“车辆-桥梁”系统动力学计算模型和“桥梁-结构”系统动力学计算模型两个子系统,对两个子系统分别进行分析求解。通过高速列车运行过程中对桥梁结构的激励时程将两个子系统加以联系。(4)在GSAP中建立“车辆-桥梁”系统动力模型计算得到了高速列车对桥梁的激励时程。在ANSYS中实现了“桥梁-结构”系统动力分析模型的建立。同时用APDL语言开发了列车激励力作用下的时程分析求解程序,使得“桥梁—结构”系统动力分析得以实现。(6)通过对整体模型与去掉雨棚和顶棚后的分模型的动力分析结果的对比,验证了在对候车厅楼板的振动响应进行计算分析时可以用分模型来代替整体模型,从而大大提高求解效率。(7)在对典型工况下楼板的位移、加速度的大小及分布规律和具有代表性的楼板结构内力的分析后,结合相应的评价标准得出了整个站房结构的安全性和舒适性均满足要求的结论。即经过“列车—桥梁—站房结构”系统动力分析后可以得出:在高速列车作用下,新广州站站房建筑结构的振动响应在设计允许的范围之内。更多还原

【Abstract】 For the elevated station, because of an organic whole that viaduct connected with the main structure of station, it is possible that the vibration caused by the train through the viaduct may make the entire building structure not be used normal or make normal users and visitors’ unease, even more panic. Therefore, it is necessary to conduct in-depth study about the law of impacted vibration caused by high-speed trains through the station on the elevated structure. In this paper, taking the New Guangzhou Station as example, the vibration of building structures induced by the high-speed train was discussed. The main research works are as follows:1) It is difficult to evaluate the vibration response of the "train-bridge-structure" integrated complex system. Aiming at this problem, this article discusses and puts forward a new scheme that the vibration response of "train-bridge" system and "bridge-structure" system are researched respectively. In this paper, based on comprehensive consideration of our country’s actual circumstance and international practices, the suitable standards of vibration control are selected for the different systems.2) According to the theory of vibration analysis of train-bridge time-varying system, the analysis of vehicle-bridge coupling vibration on the separate continuous bridge from the New Guangzhou Station structure is implemented in this paper, and the conclusion is educed that the bridges which are the foundations of the New Guangzhou Station are safe and stabile enough.3) The dynamic interaction analysis of the "train-bridge- structure" system is realized by dividing entire model into two subsystems, the dynamic calculating models of "train- the equivalent bridge" system and the "bridge-structure" system. The analysis and solution of the two subsystems are accomplished respectively. And the bridge excitant time history induced by the high-speed trains will be calculated and used to integrate the two subsystems.4) The dynamic model of "train-bridge" system is established in GSAP software, thus the bridge excitant time history induced by the high-speed trains can be obtained. The "bridge-structure" system model of dynamic analysis is achieved in ANSYS. And the program is developed by APDL language which is used to solve the time-history analysis procedures, making a "bridge-structure" system dynamic analysis achievable.5)By analyzing the results of the dynamic analysis in two contrasted models, the overall model of "bridge-structure" system and the sub-model with canopy and roof removed from the overall model, the evaluation of vibration response for the waiting room can be implemented by the dynamic analysis of the sub-model instead of the overall model, so that the efficient of calculation is improved significantly.6) By analyzed the results of the analysis of dynamic in two contrasted models, which one is the overall model of "bridge - structure" system and the other is the sub-model of canopy and roof are removed from the overall model, the evaluation of vibration response for the waiting room can be implemented by the dynamic analysis of the sub-model to replace the overall model.7) By analyzing the value and distribution of the displacement and acceleration of the floor on typical conditions and checking the internal forces of the representative structure of the floor, combined with the corresponding evaluation criteria, this paper elicits the conclusion that the entire structure of New Guangzhou Station is safe and comfortable.更多还原