城际铁路4×40m连续刚构桥与无缝线路相互作用研究  

Research on the Interaction between 4×40m Continuous Rigid Frame Bridge and CWR of Intercity Railway

作　　者：王伟华 WANG Weihua(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《中国铁路》2023年第4期100-107,共8页China Railway

基　　金：中国铁路设计集团有限公司科技开发项目(2022A02238003)。

摘　　要：为探究多联连续刚构桥与无缝线路相互作用规律,研究梁轨相互作用,建立城际铁路4×40 m连续刚构桥与无缝线路有限元计算模型,分析不同体系刚度、桥墩沉降对钢轨纵向力、扣件垂向力、桥墩附加力的影响。研究结果表明:刚构桥体系刚度增加有利于无缝线路受力,随着体系纵向刚度的增加,无缝线路伸缩力与制动力均降低,制动力所受的影响更大,伸缩力所受影响不明显。温度工况下路桥过渡处桥墩受附加力最不利,其余联桥墩附加力基本相同;断轨工况下断轨所在两联桥墩受力最不利,桥墩附加力向远端逐渐衰减。钢轨与扣件受力随着桥墩沉降量的增加而线性增大,次边墩沉降引起的扣件拉力值更大,在运营过程中应重点关注。研究成果可为多联4×40 m连续刚构桥铺设无缝线路提供理论指导。In order to explore the interaction law between multi-span continuous rigid frame bridge and CWR,and study the beam-rail interaction,a finite element calculation model of 4×40 m continuous rigid frame bridge and CWR of intercity railway is established,and the influence of different system stiffness and pier settlement on longitudinal rail force,vertical fastener force and additional pier force is analyzed.The research results show that the increase of rigid frame bridge system stiffness is conducive to stress bearing of CWR.With the increase of longitudinal stiffness of the system,both the stretching force and braking force of CWR decrease,the braking force is greatly affected and the stretching force is not obviously affected.Under the working condition of temperature,the additional force on the pier at the transition of railway and bridge is the most unfavorable,and the additional force on piers with other spans is basically the same;under the working condition of broken rail,the stress on the two-span pier where the broken rail is located is the most unfavorable,and the additional force on the pier gradually attenuates to the far end.The stress of rails and fasteners increases linearly with the increase of pier settlement,and the tension value of fasteners caused by secondary side pier settlement is larger,which should be given extra attention during operation.The research results can provide theoretical guidance for the laying of CWR for multi-span 4×40 m continuous rigid frame bridges.

关 键 词：城际铁路 连续刚构桥 无缝线路 梁轨相互作用 体系刚度 桥墩沉降 

分 类 号：U213.91[交通运输工程—道路与铁道工程]