高速铁路64m主跨桥上无缝道岔检算与结构优化  

Checking and Structure Optimization of Welded Turnout on 64m-span Bridge in High Speed Railway

作　　者：蔡小培[1] 张乾 万洪波 高增增 CAI Xiaopei;ZHANG Qian;WAN Hongbo;GAO Zengzeng(Beijing Jiaotong University,Beijing 100044,China;China Railway Design Corporation,Tianjin 300142,China)

机构地区：[1]北京交通大学,北京100044 [2]中国铁路设计集团有限公司,天津300142

出　　处：《铁道工程学报》2020年第9期12-17,共6页Journal of Railway Engineering Society

基　　金：国家自然科学基金(51778050);国家重点研发计划(2016YFB1200100)。

摘　　要：研究目的:为研究高速铁路64 m主跨连续梁桥上铺设无砟轨道无缝道岔的可行性,本文以京雄城际铁路黄固特大桥为研究对象,基于道岔-桥梁相互作用原理、非线性有限元理论,建立无缝道岔-无砟轨道-桥梁空间耦合静力学模型,研究在温度作用、列车垂向荷载、列车制(启)动荷载以及断轨时的大跨桥上无缝道岔力学特性,提出一套适用于大跨桥梁无缝道岔的检算方法和轨道结构优化方案。研究结论:(1)主跨64 m连续梁全桥采用常阻力扣件时,温度和列车荷载下钢轨附加力较大,钢轨最大拉、压应力分别为382.01 MPa和371.30 MPa,超过钢轨容许应力;(2)温度作用下的尖轨、心轨相对基本轨的位移大于挠曲和制(启)动两种工况,相对位移值远小于限值要求;(3)当连续梁两侧相邻一跨简支梁及一侧梁端20 m范围内采用小阻力扣件时,钢轨总应力相对比常阻力扣件方案可降低12.03%,强度、稳定性等指标均可满足规范要求;(4)本研究成果可为大跨桥梁无缝道岔的设计与铺设提供借鉴与参考。Research purposes: In order to study feasibility of welded turnout on 64 m-span bridge in high-speed railway,the welded turnout on Huanggu Bridge of Beijing-Xiong’ an Intercity Railway was taken as the object in this paper. Based on the turnout-bridge interaction principle and nonlinear finite element theory,the spatial coupling static model of the welded turnout-ballastless track-bridge was established. The mechanical properties of welded turnouts on long-span bridge under temperature effects,vertical train loads,train braking( starting) loads and broken rails were studied. A set of checkout methods and track structural optimization scheme for welded turnout on large-span bridges was proposed.Research conclusions:( 1) When the constant resistance fasteners were used for the 64 m-span continuous beam,the additional force of the rail under temperature and train load was large. The maximum tensile and compressive stress of the rail was 382. 01 MPa and 371. 30 MPa respectively and exceeded rail allowable stress.( 2) The displacement of the nose rail and switch rail relative to the stock rail under the effect of temperature were greater than flexure and braking( starting). The two relative displacement values were far less than the requirements of the specification.( 3) When small resistance fasteners were used on simple supported beams adjacent to both sides of the continuous beam and within20 m on one end of the beam,total rail stress can be reduced by 12. 03% compared to the constant resistance fastener scheme. The strength and stability can meet the requirements.( 4) The research can be used as reference for design and laying of welded turnouts on large-span bridges.

关 键 词：高速铁路 桥上无缝道岔 结构优化 小阻力扣件 

分 类 号：U213.6[交通运输工程—道路与铁道工程]