重载铁路列车荷载作用下桥上曲线动力响应分析

发布时间：2018-03-24 17:13

本文选题：重载铁路　切入点：桥上曲线　出处：《北京交通大学》2014年硕士论文

【摘要】：摘要：重载铁路在穿越地形复杂地段,为满足线位控制要求,大量在高架桥上设置曲线,桥上曲线在列车作用下的力学性能对线路设计至关重要。针对我国重载铁路中桥上曲线设置情况,采用理论模型分析了列车荷载作用下的桥梁曲线地段动力响应,研究得到了曲线地段列车动力作用响应影响范围,主要研究成果如下： (1)建立了比较完整的桥梁曲线地段的动力分析模型,模型考虑了钢轨、轨枕、道床及桥梁参振特性,分析了曲线地段结构自振规律,并通过相关测试数据验证了所建模型。 (2)曲线离心力作用下桥上曲线地段横向动力响应研究表明：列车编组大于4节后,编组数不会对曲线地段横向动力响应的幅值和范围产生影响；横向动力响应幅值随速度提高而增大,但速度提高不会增大横向动力响应的影响范围；列车经过曲线地段时,离心力作用引起的线路动力响应影响到列车运行位置相邻桥跨。 (3)列车轴重荷载作用下桥上曲线地段垂向动力响应研究表明：列车编组大于3节后,编组数不会对曲线地段的垂向动力响应的幅值和范围产生影响；随着列车运行速度的提高垂向动力响应幅值增大,但速度的提高不会增大列车轴重荷载作用下垂向动力响应影响范围；列车行经曲线地段时,轴重荷载作用引起的线路动力响应影响到列车运行位置相邻桥跨。
[Abstract]:Absrtact: in order to meet the requirement of line position control, heavy haul railway sets up curves on viaduct in order to meet the need of crossing the complex terrain. The mechanical performance of the curve on the bridge under the action of the train is very important to the design of the railway line. In view of the setting of the curve on the bridge in the heavy haul railway in China, the dynamic response of the section of the bridge curve under the train load is analyzed by using the theoretical model. The influence range of train dynamic response in curve section is obtained. The main research results are as follows:. 1) A relatively complete dynamic analysis model of the curved section of the bridge is established. The model takes into account the vibration characteristics of the rail, sleeper, track bed and bridge, analyzes the natural vibration law of the curved section structure, and verifies the model through the relevant test data. 2) under the action of curve centrifugal force, the transverse dynamic response of the curve section on the bridge is studied. The results show that the number of train groups will not affect the amplitude and range of the transverse dynamic response of the curve section after the train formation is greater than 4 knots; The amplitude of lateral dynamic response increases with the increase of velocity, but the increase of speed does not increase the range of influence of lateral dynamic response. When the train passes through the curve section, the line dynamic response caused by centrifugal force affects the adjacent bridge span in the train running position. 3) the vertical dynamic response of the curve section on the bridge under the load of axle load shows that the number of train groups will not affect the amplitude and range of the vertical dynamic response of the curve section after the train formation is larger than 3 knots. With the increase of train speed, the amplitude of vertical dynamic response increases, but the increase of speed does not increase the influence range of vertical dynamic response under axle load. The dynamic response of the track caused by axle load affects the adjacent bridge span in the train running position.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

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