一种研究高铁轨面-桥梁横向变形映射关系的精细化解析模型  

A REFINED ANALYTICAL MODEL FOR STUDYING THE MAPPING RELATIONSHIP BETWEEN RAIL GEOMETRY AND LATERAL BRIDGE DEFORMATION OF HIGH-SPEED RAILWAY

作　　者：聂磊鑫 蒋丽忠[1,2] 周旺保 NIE Lei-xin;JIANG Li-zhong;ZHOU Wang-bao(School of Civil Engineering,Central South University,Changsha,Hu’nan 410075,China;National Engineering Research Center of High-speed Railway Construction Technology,Changsha,Hu’nan 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程研究中心,湖南长沙410075

出　　处：《工程力学》2024年第7期88-98,共11页Engineering Mechanics

基　　金：国家自然科学基金项目(U1934207,52078487,51778630);中南大学中央高校基本科研业务费专项资金资助项目(2022ZZTS0623)。

摘　　要：强震后的桥墩和支座不可避免会产生一定残余变形,引起钢轨的几何不平顺,直接影响行车安全性和舒适性。该文基于势能驻值原理推导了CRTS-Ⅱ型纵连式无砟轨道横向变形与桥梁结构横向变形之间的映射解析表达式,提出了可考虑层间各构件刚度贡献的解析映射模型。通过有限元模型和文献解析模型验证了该文解析映射模型,进而基于该模型定量分析了层间构件对钢轨横向映射变形的影响。结果表明:梁体横向错台下的钢轨映射变形呈现明显非对称性,且跟随主梁变形的特性较差;扣件对钢轨映射变形的影响很小;CA砂浆层对梁体错台下钢轨映射变形幅值的影响很大,滑动层次之,而对钢轨映射变形范围的影响则弱于滑动层;剪力齿槽对钢轨映射变形的影响最大,侧向挡块次之;剪切钢筋对钢轨映射变形的影响可以忽略;桥梁抗弯刚度对钢轨映射变形范围有一定影响,而对钢轨映射变形幅值的影响几乎可以忽略。The piers and bearings will inevitably produce certain residual deformations after a strong earthquake,causing geometric irregularities of the rails,which directly affects the running safety and comfort of the train.Based on the principle of stationary potential energy,the analytical expression of the mapping between the lateral deformation of CRTS-II longitudinal continuous ballastless track and the lateral bridge deformation is derived.An analytical mapping model that can consider the stiffness contribution of each component between layers is proposed.The analytical mapping model is verified by the finite element model and the other analytical models in literatures.The influence of the interlayer components on the lateral mapping rail deformation is quantitatively analyzed.The results show that:the mapping rail deformation under the girder fault shows obvious asymmetry,and the characteristic subsequent to the deformation of the girder is inferior.Fasteners have little effect on the mapping rail deformation.The CA mortar layer has a great influence on the amplitude of the mapping rail deformation under the girder fault.However,the CA mortar layer has a weaker effect on the mapping rail deformation range than the sliding layer.The shear grooves have the greatest influence on the mapping rail deformation,followed by the lateral blocks.The influence of shear rebar on mapping rail deformation is negligible.The flexural stiffness of the girder has a certain influence on the deformation range of the rail mapping,but the influence on the amplitude of mapping rail deformation is almost negligible.

关 键 词：高速铁路桥梁 无砟轨道 解析模型 势能驻值原理 横向映射变形 

分 类 号：U24[交通运输工程—道路与铁道工程] TU311.4[建筑科学—结构工程] U213.2