中国铁道科学2017，Vol.38Issue(6)：37-46,10.DOI:10.3969/j.issn.1001-4632.2017.06.06
组合荷载下桥上纵连板式无砟轨道疲劳特性
Fatigue Characteristics of Longitudinally Connected Slab Ballastless Track on Bridge under Combined Load
摘要
Abstract
Based on the theory of train-track-bridge coupling dynamics,the theory of longitudinal interaction between ballastless track and bridge as well as the theory of temperature field and temperature effect on ballastless track,a fatigue life prediction method for the longitudinally connected slab ballastless track on bridge was established,which considered the interaction between steel bar and concrete in ballastless track,the crack and closure effect of ballastless track concrete as well as the combined effects of the time-varying characteristics of ballastless track load during service life.Taking the ballastless track on 32 m multi-span simply supported box girder bridge for high speed railway as an example,the fatigue characteristics of the longitudinally connected slab ballastless track on bridge under combined loads were studied with the proposed method.Results showed that,in order to accurately predict the fatigue characteristics of longitudinally connected slab ballastless track on bridge during service life,the combined action of train load,temperature load and temperature gradient load should be considered.The fatigue life of the longitudinally connected slab ballastless track on bridge was controlled by the track at the end of box girder.The bottom surface concrete of the track slab and the top surface concrete of the base plate at the end of box girder were more prone to fatigue failure.The crack spacing of ballastless track and climatic environment had great effect on the fatigue characteristics of each component of the longitudinally connected slab ballastless track on bridge.The fatigue life of track slab concrete,the steel bar of base plate and base plate concrete for the ballastless track in Wuhan area is respectively 2.5,3.9 and 222.6 times of those in Harbin area.When the crack spacing changes from 2 times to 1 time of fasteners' gap,the fatigue life of steel bar in ballastless track will increase by more than 10 times.关键词
高速铁路/轨道结构/桥上纵连板式无砟轨道/疲劳特性/组合荷载Key words
High speed railway/Track structure/Longitudinally connected slab ballastless track on bridge/Fatigue characteristics/Combined load分类
交通工程引用本文复制引用
徐庆元,林青腾,方子匀,张泽,娄平,肖祖材,段俊..组合荷载下桥上纵连板式无砟轨道疲劳特性[J].中国铁道科学,2017,38(6):37-46,10.基金项目
国家自然科学基金资助项目(51178469) （51178469）
国家自然科学基金-高速铁路基础研究联合基金资助项目(U1334203,U1134209) （U1334203,U1134209）
