地铁小半径曲线段双非减振扣件系统横向力传递特性分析  

Analysis of transverse force transfer characteristics of double-non-vibration damping fastener system in small radius curve section of subway

作　　者：赵才友[1,2] 张明凯 赵炎南 ZHAO Caiyou;ZHANG Mingkai;ZHAO Yannan(Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道科学与工程学报》2024年第11期4487-4496,共10页Journal of Railway Science and Engineering

基　　金：国家重点研发计划资助项目(2022YFB2603404);高速铁路基础研究联合基金资助项目(U1734207);国家自然科学基金资助项目(51978585)。

摘　　要：为了探究地铁小半径曲线段上部锁紧式双层非线性减振扣件系统在服役时横向力的传递特性,通过室内试验测得荷载-位移曲线,根据实际尺寸建立减振扣件系统精细化有限元模型,在与试验对比验证的基础上,分析其内部的横向力传递过程及各个部件的受力情况,并由此开展相关因素对减振扣件系统横向力传递的影响规律。研究结果表明:上部锁紧式双层非线性减振扣件系统在横向荷载的作用下,横向力的内部传递过程较为复杂,表现出明显的非线性特征;同时施加垂向和横向荷载时,减振扣件系统的整个横向传力过程分为工作边轨距块静摩擦力被克服、非工作边轨距块静摩擦力被克服、非工作边侧轨下垫板压缩变形、非工作边轨距块横向支承、轨下垫板静摩擦力增幅减缓5个阶段;钢轨轨底和轨距块之间的摩擦因数、扣压力是影响轨距块由最大静摩擦力变为动摩擦力所需要外荷载大小的关键因素,摩擦因数越大,所需要的外荷载越大;而钢轨轨底与轨下垫板之间的摩擦因数对减振系统的横向力传递行为影响较小,这是因为钢轨轨底与轨下垫板之间一直都是静摩擦力,削弱了因摩擦因数的变化对整个横向力传递过程的影响。该研究旨在为今后减振扣件系统的横向刚度设计优化及轮轨动力学仿真计算提供实验依据和理论指导。In order to explore the transverse force transfer characteristics of the locked double-layer nonlinear vibration damping fastener system in service at the upper part of the small-radius curve section of the subway,the load-displacement curve was measured through laboratory tests.The refined finite element model of the vibration damping fastener system was established according to the actual size.Based on the comparison and verification with the tests,the transverse force transfer process inside the system and the stress of each component were analyzed.The influence law of related factors on transverse force transmission of vibration damping fastener system was developed.The results show that the internal transmission process of the lateral force of the upper locked double-layer nonlinear damping fastener system under the action of the lateral load is complicated and shows obvious nonlinear characteristics.When vertical and lateral loads are applied at the same time,the whole transverse force transfer process of the vibration damping fastening system is divided into five stages.The static friction force of the working side gauge block is overcome.The static friction force of the non-working side gauge block is overcome.The compression deformation of the underrail plate on the non-working side,the lateral support of the non-working side gauge block,and the increase of the static friction force of the underrail plate is reduced.The friction coefficient and buckle pressure between rail bottom and gauge block are the key factors that affect the external load required by the maximum static friction force of gauge block.The greater the friction coefficient is,the greater the external load is required.However,the friction coefficient between the bottom of the rail and the bottom plate of the rail has little influence on the transverse force transfer behavior of the vibration reduction system,because there is always static friction force between the bottom of the rail and the bottom plate of the rail,which weakens the inf

关 键 词：减振扣件系统 室内试验 有限元仿真 横向力 传递规律 

分 类 号：U213.5[交通运输工程—道路与铁道工程]