持续高温环境下桥上CRTSⅢ型无砟轨道热响应分析
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中图分类号：U213.9 文献标志码：A
Thermal Response Analysis of the CRTS II Type Ballastless Trackon Bridge Under Sustained High Temperature Environment
ZhangPengfei'，YuLu’，JiangHaoyu'，ZhaiLihua²，LiuShuyu' （1.State KeyLaboratoryofRailTransit InfrastructurePerformance MonitoringandGuarantee，East China Jiaotong University Nanchang 33oo13，China; 2.KeyLaboratory ofRoad and Traffic Engineering of the Ministry ofEducation，Tongji University，Shanghai 201804）
Abstract： Based on the theory of heat transferand the mechanics of beam-slab-rail interaction，a refined thermomechanical coupling model for the bridge-mounted CRTs II type ballastless track seamless lines was establishedto simulatethe temperature field，longitudinal forces，and displacement variationsof the track structure components under sustained high temperature environment ranging from 2～10 days.The findings elucidate a direct correlation between the escalation of sustained high temperature periods and the continual increase in temperature within the track structure， with an accentuated phenomenon of heat accumulation at deeper vertical strata. 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 exertedon the stelrailsand the longitudinal displacements of the track structure exhibit a cumulative pattern with the extensionofthe high-temperature regimen.Incontrast，the longitudinalstresses within thetrack slabs， self-compacting concrete layers and slab demonstrate a decremental trend in correlation with the duration days.
Key words：sustained high temperature;； CRTS II balastless track on the bridge;seamless track; thermal re-sponse
Citation format：ZHANG PF， YUL，JIANG HY， et al. Thermal response analysis of the CRTS Il type ballastless track on bridge under sustained high temperature environment[J]. Journal of East China Jiaotong University，2025，42（4）： 80-87.
CRTSⅡ型无砟轨道因其在安全性、经济性、耐久性以及施工维护方面的优势，已逐步确立为我国新建高速铁路主型无砟轨道结构[1-2]。（剩余10863字）
