桥上无缝线路断轨力深化研究  

Intensive Research on the Breaking Force of Continuous Welded Rail on Bridge

作　　者：张泽 黄晨睿 ZHANG Ze;HUANG Chenrui(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;Chang'anDublin International Transportation College,Chang'anUniversity,Xi'an 710021,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]长安大学长安都柏林国际交通学院,西安710021

出　　处：《铁道标准设计》2022年第12期27-31,共5页Railway Standard Design

基　　金：中国国家铁路集团有限公司科技研究开发计划课题(N2021G049,K2021G020);中铁第四勘察设计院集团有限公司科技研发课题(2021K004)。

摘　　要：现行TB10015—2012《铁路无缝线路设计规范》中断轨力取值偏于保守,往往限制桥梁设计。以铁路常用的16,20,24,32,40 m简支梁为研究对象,建立钢轨-桥梁-桥梁墩台三维有限元空间力学计算模型。考虑无砟及有砟轨道类型、不同简支梁墩台刚度,分别模拟计算双线4根钢轨折断、单根钢轨折断工况下的墩台断轨力,在此基础上,提出简支梁断轨力计算公式修正系数。研究结果表明,墩台刚度接近刚性时,16m,40m跨长简支梁修正系数分别为规范值的0.98,0.8倍,即简支梁跨长越长,修正系数越小;40m跨长简支梁在铺设无砟轨道、有砟轨道的修正系数分别为规范值的0.8,0.9倍,即相同跨长简支梁下,无砟轨道修正系数小于有砟轨道。The value of the rail-breaking force in the TB10015—2012 Code for Design of Railway Continuous Welded Rail is conservative and sometimes restricts the design of the bridge.This paper takes the 16,20,24,32 m and 40 m simply supported beams commonly used in railway as research objects,and establishes the three-dimensional finite element calculation model of the rail-bridge-beam abutment.The established model is used to calculate the rail breaking force of the abutment under the conditions of four rail breaking and single rail breaking in view of the ballastless and ballasted tracks,and different stiffness of simply supported beam abutments.On this basis,the correction coefficient of the breaking force calculation formula is proposed.The research results show that the correction coefficient of 16m and 40m simply supported beams is respectively 0.98 and 0.8 times of the standard value,the longer the simply supported beam span,the smaller the correction coefficient;the correction coefficient of ballastless track and ballasted track for the 40m span simply supported beam is respectively 0.8 and 0.9 times of the standard value;for simply supported beams of the same span,the correction coefficient of ballastless track is smaller than that of ballasted track.

关 键 词：无缝线路 简支梁桥 三维模型 断轨力 修正系数 

分 类 号：U213.9[交通运输工程—道路与铁道工程] U441.7[建筑科学—桥梁与隧道工程]