斜拉桥上无缝线路力学分析与调节器布置研究

摘要

研究目的:斜拉桥跨度大、梁体长,相比于普通铁路桥梁,其梁轨相互作用关系更为复杂.针对长联大跨斜拉桥上铺设无缝线路的相关研究以及工程应用较少,特别是结构间相互作用、力学行为与伸缩调节器优化布置等研究相对匮乏,本文以新建安九铁路长江特大斜拉桥为背景,建立斜拉桥上无缝线路空间耦合模型,研究分析斜拉桥上无缝线路的结构设计方案.研究结论:(1)斜拉桥温度跨度较大,不设伸缩调节器、全桥铺设常阻力或小阻力扣件时,钢轨强度、轨道稳定性等指标不能满足规范要求;(2)为减小梁轨间相互作用,主梁两端应设置单向伸缩调节器;(3)伸缩调节器尖轨应设置于连续主梁上,铺设常阻力扣件,基本轨位于边跨简支梁、跨越梁缝,基本轨侧可铺设小阻力或常阻力扣件;(4)本研究成果可为铁路斜拉桥上无缝线路设计检算、结构优化及伸缩调节器布置提供借鉴.%Research purposes:Compared with the common railway bridge,the interaction between the bridge and rail on cable-stayed bridge with large span and long beams is more complicated.There is little related research and engineering application of continuous welded rail (CWR) on the long span cable-stayed bridge.Especially,the research on the interaction between structures,mechanical behaviors and optimal arrangement of rail expansion joints (REJ) are relatively inadequate.In this paper,based on the Anqing-Jiujiang Railway Yangtze River Long-span Cable-stayed Bridge,the spatial coupling model of CWR on bridge is established and the design schemes of CWR on the bridge are studied and analyzed.Research conclusions:(1) Due to that temperature span of cable-stayed bridge is large and the REJ is not used,the rail strength and track stability cannot meet the requirements of the standards when the whole bridge is laid with constant and small resistance fasteners.(2) In order to reduce the interaction between the beam and rail,two sets of one-way REJ are arranged at both ends of the main beam.(3) Switch rail of REJ should be arranged on the continuous main beam with constant resistance fasteners.The stock rail is located at the simply supported beam of the side span.Small or constant resistance fasteners can be laid on the stock rail side.(4) The research can be used as reference for design and checking,structural optimization and arrangement of REJ for CWR on cable-stayed bridge.