活动支座摩阻力对桥上无缝线路力学特性的影响

Influence of the Expansion Bearing Friction Force to Mechanical Characteristics of CWR Track on Bridge

在我国铁路的建设过程中,高架桥梁所占的比例越来越大。桥梁的活动支座处存在一定数量的摩阻力,在温度和车辆荷载的作用下,可能会使轨道和桥梁结构的受力与变形增大。由于现有的铁路设计规范中对活动支座处的摩阻力并没有特殊的规定,因此在进行常规的理论仿真分析时,一般不考虑活动支座处摩阻力的影响,这种算法上的简化可能会使温度和车辆荷载作用下的计算结果产生比较大的偏差。通过建立考虑活动支座摩阻力和不考虑活动支座摩阻力的两种铺设CRTSⅠ型板式无砟轨道的桥上无缝线路精细化空间耦合仿真模型,研究活动支座处摩阻力对梁轨相互作用的影响,并对今后分析桥上无砟轨道无缝线路结构时是否考虑活动支座处的摩阻力提供建议和参考依据。

With the construction of railways in our country,the ratio of the bridge in railways is higher and higher.As there is always friction force at the expansion bearing of the bridge,it will produce some influence to the force and displacement of the track structure and bridge structure under load of temperature and train,and magnify the force and displacement.Now in the railway design code,there is no special provision to the friction force of expansion bearing.In general the oretical analysis,friction force of expansion bearing is not considered.This shortcut calculation may cause more influence to the analytical results of temperature load and train load,and produce deviation.This paper will build two kinds of the meticulous spatial coupled simulation models of CRTSⅠslab ballastless CWR track on bridge,one is considered the friction force of expansion bearing and one is not considered.And this paper studies the influence of the friction force of expansion bearing to the interaction between beams and rails.Provide reference and propose to whether the friction force at the expansion bearing is considered in the analysis of the ballastless CWR track on bridge.