持续高温环境下桥上CRTS Ⅲ型无砟轨道热响应分析OA

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.