首页|不同温度速率下桥上CRTS Ⅱ型板式无砟轨道热力学性能研究

不同温度速率下桥上CRTS Ⅱ型板式无砟轨道热力学性能研究

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针对我国CRTSⅡ型板式无砟轨道的复杂温度荷载效应,重点研究不同温度速率变化对桥上CRTSⅡ型板式无砟轨道结构热力学性能的影响.通过大型环境模拟试验箱,开展简支箱梁上5块CRTSⅡ型板式无砟轨道的1∶4几何缩尺模型的温度试验,对比分析3种环境温度变化速率下无砟轨道内的温度和应力分布特征;建立两端自由和两端约束条件下缩尺模型的热传导数值模型,验证了该数值模型的有效性,分析了两种约束条件下无砟轨道-箱梁结构的三维温度场、应力场和位移的变化规律.结果表明,随着温度变化速率下降,无砟轨道-箱梁结构的竖向位移和温度变化幅值在增大,但竖向多层的温度和位移数值在下降;结构的应力、轨道板轴力也不断增大,特别是温度变化速率从0.67 ℃/min下降到0.44 ℃/min时.此外,两端自由的纵向应力和竖向位移均比两端约束的小,但其温度要大于两端约束的,约束边界条件会加速轨道内热传递过程.
Study on Thermodynamic Performance of CRTS Ⅱ Slab Ballastless Track on Bridge under Different Temperature Change Rates
With respect to the complex temperature load effects of CRTS Ⅱ slab ballastless track in China,the influence of temperature change rates on the thermodynamic performance of the CRTS Ⅱ slab track on a bridge was studied in this paper.Firstly,under a large-scale environment simulation testing box,temperature tests were conducted on five CRTSⅡ track slabs on a simply-supported box girder,using a 1∶4 geometric scale model,to compare and analyze the tem-perature and stress distribution of the scale model under three rates of ambient temperature change.Secondly,the heat conduction models of the scaled model with two constraint conditions of fixed and free boundary at both ends were estab-lished,and were validated by the experimental results.The 3D temperature field,stress field,and displacement of the scale models under two constraint conditions were analyzed,respectively.The results show that with the decrease of tem-perature change rate,the change amplitude of structural vertical displacement and internal temperature increase,while their values of each layer gradually decrease.The structural stress and the axial force of the track slab of the fixed con-straint condition continue to increase,especially when the temperature change rate decreases from 0.67 ℃/min to 0.44℃/min.In addition,the longitudinal stresses and vertical displacements of the track structure with non-constraint condition are smaller than those with fixed constraint condition,while their temperatures are larger than those with fixed constraint condition,which indicates that the fixed constraint condition could accelerate the heat transfer in the track structure.

CRTS Ⅱ slab ballastless track on bridgestemperature simulation testtemperature change ratesthermody-namic performanceheat conduction modeldifferent constraint conditions

周锐、陈登高、朱烜、刘伟斌、杜彦良、李世亚

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深圳大学极端环境绿色长寿道路工程全国重点实验室,广东深圳 518060

深圳铁路投资建设集团有限公司,广东深圳 518000

中国铁道科学研究院集团有限公司高速铁路轨道技术国家重点实验室,北京 100085

重庆交通大学山区桥梁与隧道工程国家重点实验室,重庆 400074

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桥上CRTSⅡ型板式无砟轨道 温度模拟试验 温度变化速率 热力学性能 热传导模型 不同约束条件

国家自然科学基金深圳市科技计划深圳市科技计划中国国家铁路集团有限公司科技研发计划高速铁路轨道技术国家重点实验室开放基金省部共建山区桥梁及隧道工程国家重点实验室(重庆交通大学)开放基金省部共建山区桥梁及隧道工程国家重点实验室(重庆交通大学)开放基金

52278311GJHZ20220913143006012GJHZ20200731095802007K2022G0382021YJ143SKLBT-ZD2101SKLBT-YF2104

2024

10.3969/j.issn.1001-8360.2024.05.012

铁道学报
中国铁道学会

铁道学报

CSTPCD北大核心
影响因子：0.9
ISSN：1001-8360
年,卷(期)：2024.46(5)
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