不同轨道板系统梁体线性变化对钢轨映射变形敏感性分析  

Sensitivity Analysis of the Rail Mapping Deformation of Different Track Systems Due to the Linear Change of the Girder Geometry

作　　者：刘丽丽[1] 蒋丽忠[1,2] 周旺保 刘祥[1] 吴凌旭 张云泰 LIU Lili;JIANG Lizhong;ZHOU Wangbao;LIU Xiang;WU Lingxu;ZHANG Yuntai(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High Speed Railway Construction,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]高速铁路建造技术国家工程实验室,长沙410075

出　　处：《铁道标准设计》2022年第7期17-24,共8页Railway Standard Design

基　　金：国家自然科学基金项目(U1934207,52078487,51778630);湖南创新型省份建设专项经费资助项目(2019RS3009)。

摘　　要：为研究不同轨道系统简支梁桥钢轨映射变形和扣件内力对梁体线性变化的敏感性,在考虑高速铁路桥梁-轨道系统层间相互作用机理和变形协调的基础上,分别建立CRTSⅠ型、CRTSⅡ型和CRTSⅢ型板式无砟轨道系统8跨32 m简支梁桥ANSYS有限元模型,研究3种简支梁桥体系中钢轨变形和扣件内力的变化规律。结果表明,在相同工况下,三者钢轨变形及扣件内力曲线几何形态大体一致;三者钢轨变形都具有良好的“跟随性”;梁体变形量越大,钢轨变形及扣件内力幅值越大。相同工况下,钢轨变形幅值及扣件内力幅值有所不同,CRTSⅡ型轨道系统中幅值最小,而在CRTSⅢ型轨道系统中最大,即CRTSⅡ型轨道系统对梁体几何线性变化最不敏感。In order to study the sensitivity of rail mapping deformation and fastener internal force of simply-supported bridges with different track systems under the condition of the linear change of the girder geometry, the ANSYS finite element models of 8-span 32 m simply-supported bridges with China Rail Track System(CRTS)Ⅰ slab ballastless track(SBT) system, CRTSⅡ SBT system and CRTSⅢ SBT system are established respectively in view of the interaction mechanism and deformation coordination of the high-speed railway bridge-ballastless track system. The laws of rail deformation and fastener internal force variation in the three kinds of simply-supported bridge systems are studied. The results show that under the same condition, the geometric shape of rail deformation and fastener internal force curve of the three are basically the same;the rail deformation of the three has good “following features”;The greater the beam deformation is, the greater the rail deformation amplitude and the fastener internal force amplitude are. Under the same working conditions, the rail deformation amplitude and fastener internal force amplitude of the three systems are different. The rail deformation amplitude and fastener internal force amplitude of CRTSⅡ SBT system are the smallest, and those of CRTSⅢ SBT system are the largest. Therefore, CRTSⅡ SBT system is the least sensitive to the linear change of the girder geometry.

关 键 词：高速铁路 桥墩沉降 梁体错台 钢轨映射变形 敏感性分析 简支梁桥 

分 类 号：U213.244[交通运输工程—道路与铁道工程] U238