一种高速铁路抢修梁的车桥耦合振动分析

发布时间：2018-09-16 18:57

【摘要】：高速铁路作为一种绿色环保、安全快捷的交通运输方式,在我国交通运输体系中逐渐占据骨干地位。中国是目前世界上高铁运营里程最长、在建规模最大的国家,但目前国内尚没有专门针对高铁桥梁的抢修技术和抢修器材储备,研究一种适应高铁桥梁抢修需要的梁部抢修结构显得尤为迫切。本文课题组在前期研究中,提出了一种可转换为永久桥梁结构的高铁抢修梁技术方案,并对其力学性能进行了分析研究。为了进一步考察高铁列车通过抢修梁时的安全性、舒适性和抢修梁的振动性能,本文基于有限元软件ANSYS和多体动力学软件SIMPACK,对高铁抢修梁进行了车桥耦合振动分析,主要工作和结论如下:介绍了多体系统动力学的基本理论,利用SIMPACK软件建立了列车的多体动力学模型,分析了轮轨作用关系和轨道激励方式,计算了高铁列车的线性临界速度和非线性临界速度。确定了车辆和桥梁两个相对独立子系统的动力学评判指标。针对临时通车和正常运营两种工作状态,利用ANSYS有限元子结构分析技术分别建立了抢修梁的动力分析模型,对抢修梁进行子结构分析和模态分析,获得抢修梁的自振特性。将桥梁和车辆两个子系统在轮轨接触面离散的信息点上进行数据交换,实现了车桥耦合振动仿真分析。临时通车状态抢修梁的车桥耦合分析结果表明:当车辆速度在10 km/h~130km/h范围内时,车辆安全性指标在容许范围内,车辆舒适度等级为“优”,桥梁振动性能良好,抢修梁临时通车速度可以确定为120 km/h,和预期通车速度相符合。正常运营状态抢修梁的车桥耦合分析结果表明:当车辆以350 km/h的速度通过抢修梁时,车辆安全性指标在容许范围内,车辆舒适度等级为“优”,桥梁振动性能良好。通过加厚抢修梁外侧腹板,可有效加大抢修梁的横向刚度,进而减小横桥向动位移,优化后的永久抢修梁结构和原有双线整孔预应力混凝土箱梁的车桥耦合振动性能大致相当,可以替代损毁的旧梁正常运营。
[Abstract]:As a green, safe and fast mode of transportation, high-speed railway has gradually occupied the backbone position in the transportation system of our country. China is the country with the longest operating mileage and the largest scale of construction of high-speed rail in the world. However, at present, there is no domestic reserve of emergency repair technology and emergency repair equipment for high-speed rail bridges. It is urgent to study a kind of beam repair structure to meet the need of high-speed bridge repair. In the previous research, this paper puts forward a technical scheme of high speed railway repair beam which can be converted into permanent bridge structure, and its mechanical properties are analyzed and studied. In order to further investigate the safety, comfort and vibration performance of the high-speed train when it passes through the repair beam, this paper analyzes the vehicle-bridge coupling vibration of the high-speed train rush repair beam based on the finite element software ANSYS and the multi-body dynamics software SIMPACK,. The main work and conclusions are as follows: the basic theory of multi-body system dynamics is introduced, the multi-body dynamics model of train is established by using SIMPACK software, and the wheel-rail action relationship and rail excitation mode are analyzed. The linear critical velocity and nonlinear critical velocity of high-speed train are calculated. The dynamic evaluation indexes of two relatively independent subsystems of vehicle and bridge are determined. In view of the two working states of temporary train and normal operation, the dynamic analysis model of rush repair beam is established by using ANSYS finite element substructure analysis technology. The substructure analysis and modal analysis of rush repair beam are carried out, and the natural vibration characteristics of rush repair beam are obtained. The two subsystems of bridge and vehicle are exchanged on the discrete information points of wheel / rail contact surface, and the simulation analysis of vehicle-bridge coupling vibration is realized. The results of vehicle-bridge coupling analysis of the repair beam in the temporary train condition show that when the vehicle speed is in the range of 10 km/h~130km/h, the vehicle safety index is within the allowable range, the vehicle comfort grade is "excellent", and the bridge vibration performance is good. The temporary train speed of repair beam can be determined to be 120 km/h, in accordance with the expected speed. The results of vehicle-bridge coupling analysis show that when the vehicle passes through the repair beam at the speed of 350 km/h, the vehicle safety index is within the allowable range, the grade of vehicle comfort is "excellent", and the vibration performance of the bridge is good. By thickening and repairing the external web of the beam, the lateral stiffness of the beam can be increased effectively, and then the dynamic displacement of the transverse bridge can be reduced. The optimized structure of the permanent repair beam is approximately equal to the vehicle-bridge coupling vibration performance of the original two-line full-hole prestressed concrete box girder. Can replace damaged old beam normal operation.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3

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