北京交通大学学报2025，Vol.49Issue(5)：188-197,10.DOI:10.11860/j.issn.1673-0291.20240142
简支梁桥上CRTS Ⅲ型板式无砟轨道温度场与温度应力研究
Study on temperature field and thermal stress of CRTS Ⅲ slab track on simply supported beam bridge
摘要
Abstract
To investigate the variation patterns of the temperature field and thermal stress in seamless CRTS Ⅲ slab tracks on simply supported beam bridges under high-temperature conditions,an indi-rect heat-stress coupling analysis method is employed.A finite element model of the coupled structural system of the heat-ballastless track is established to analyze the distribution and evolution of the tempera-ture field,as well as the longitudinal force,stress,and displacement distribution between track structure layers under high temperatures.The results indicate that the temperature of each structural layer of the bal-lastless track exhibits a wave-like variation with ambient temperature.Over the course of a day,the maxi-mum and minimum temperatures,53.1℃and 26.4℃,respectively,occur at the top of the track slab.The amplitude of the temperature time-history curves decreases with increasing vertical depth of the track struc-ture,and the peak temperature shows a time lag.In summer high-temperature conditions,the temperature gradient of the track slab approaches zero around 11:00 and 21:00;the positive gradient peaks at 85.5℃/m at 15:00,while the negative gradient peaks at-43.8℃/m at 03:00.As the depth of the track structure in-creases,the temperature gradient gradually decreases.Under single-day high-temperature conditions,the rail longitudinal force and track structure displacement reach their maximum around 18:00 every day,repre-senting the most unfavorable state,while the longitudinal stress in the track slab and self-compacting con-crete layer peaks between 14:00 and 16:00.These findings provide a t theoretical reference for monitoring and maintenance of track structures in high temperature regions during summer.关键词
高速铁路/温度应力/有限元法/CRTS Ⅲ型板式无砟轨道/温度场Key words
high-speed railway/thermal stress/finite element method/CRTS Ⅲ slab track/tempera-ture field分类
交通工程引用本文复制引用
张鹏飞,刘书语,江浩宇,余路,杨奥闯..简支梁桥上CRTS Ⅲ型板式无砟轨道温度场与温度应力研究[J].北京交通大学学报,2025,49(5):188-197,10.基金项目
国家自然科学基金(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)National Natural Science Foundation of China(52368063,52178425) （1600223003）
Jiangxi Provincial Science and Technology Special Project in 2022(National Science and Technology Award Reserve Cultivation Project)(20223AEI91004) （National Science and Technology Award Reserve Cultivation Project）
Jiangxi Provincial High-level High-skilled Leading Talents Cultivation Project(1600223003) （1600223003）
