华东交通大学学报2025，Vol.42Issue(4)：80-87,8.
持续高温环境下桥上CRTS Ⅲ型无砟轨道热响应分析
Thermal Response Analysis of the CRTS Ⅲ Type Ballastless Track on Bridge Under Sustained High Temperature Environment
摘要
Abstract
Based on the theory of heat transfer and the mechanics of beam-slab-rail interaction,a refined thermo-mechanical coupling model for the bridge-mounted CRTS Ⅲ type ballastless track seamless lines was estab-lished to simulate the temperature field,longitudinal forces,and displacement variations of the track structure components under sustained high temperature environment ranging from 2～10 days.The findings elucidate a di-rect correlation between the escalation of sustained high temperature periods and the continual increase in tem-perature within the track structure,with an accentuated phenomenon of heat accumulation at deeper vertical stra-ta.Additionally,there is a progressive reduction in the magnitude of the maximum positive temperature gradient,while the maximum negative temperature gradient experiences a gradual increase.Moreover,the longitudinal forces exerted on the steel rails and the longitudinal displacements of the track structure exhibit a cumulative pat-tern with the extension of the high-temperature regimen.In contrast,the longitudinal stresses within the track slabs,self-compacting concrete layers and slab demonstrate a decremental trend in correlation with the duration days.关键词
持续高温/桥上CRTS Ⅲ型无砟轨道/无缝线路/热响应Key words
sustained high temperature/CRTS Ⅲ ballastless track on the bridge/seamless track/thermal re-sponse分类
交通工程引用本文复制引用
张鹏飞,余路,江浩宇,翟利华,刘书语..持续高温环境下桥上CRTS Ⅲ型无砟轨道热响应分析[J].华东交通大学学报,2025,42(4):80-87,8.基金项目
国家自然科学基金项目(52368063,52178425) （52368063,52178425）
2022年江西省科技专项(国家科技奖后备培育项目)(20223AEI91004) （国家科技奖后备培育项目）
江西省高层次高技能领军人才培养工程项目(1600223003) （1600223003）
