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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第10期    总第290期    2018年10月

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文章编号:1672-7207(2018)10-2526-07
温升荷载下带裂工作的纵连板轨道温度力研究
刘笑凯1, 2,李威1, 2,肖杰灵1, 2,刘学毅1, 2,全毅1, 2

(1. 西南交通大学 高速铁路线路工程教育部重点实验室,四川 成都,610031;
2. 西南交通大学 土木工程学院,四川 成都,610031
)

摘 要: 针对带裂工作的纵连板式轨道,研究温升荷载作用下板内温度力的分布规律及其影响因素。根据结构温度力计算理论,推导带裂工作的纵连板式无砟轨道在温升荷载下的温度压力计算公式,并结合试验,分析不同板底约束、配筋率和轨道板混凝土弹性模量条件下裂纹对轨道纵向温度压力的影响。研究结果表明:裂纹对纵连式无砟轨道的纵向温度压力影响较大,在计算时应当考虑裂纹对纵向温度压力的影响;摩阻系数对轨道板的纵向力影响较小,计算时可不考虑;板底黏结力对轨道板纵向温度压力影响较大,板底黏结力的增加会大幅度增加裂纹闭合所需的升温值并减少因裂纹而损失的温度;配筋率越高,轨道板的纵向温度压力越高,轨道板释放的温度压力越小,但配筋率对轨道板的纵向温度压力的影响较小。板底黏结状态和轨道板配筋率应当作为计算轨道板温度压力的重要参数。

 

关键字: 纵连式无砟轨道;裂纹;温度压力;温升荷载

Study of longitudinal temperature pressure of longitudinal ballastless track with cracks
LIU Xiaokai1, 2, LI Wei1, 2, XIAO Jieling1, 2, LIU Xueyi1, 2, QUAN Yi1, 2

1. MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Abstract:With consideration of the longitudinal temperature pressure characteristics of longitudinal ballastless track with crack, formula of longitudinal temperature pressure of longitudinal ballastless track with crack was deduced. Through the experiment, effects of different slab bottom constraints, reinforcement ratio and elastic modulus of slab on the longitudinal temperature pressure of track were analyzed. The results show that the influence of the crack on the longitudinal temperature pressure of the longitudinal ballastless track is large, and the influence of the crack on the longitudinal temperature pressure should be taken into account in the calculation. The friction coefficient has little effect on the longitudinal force of slab, and it is not considered in calculating. The bond force has a large effect on the longitudinal temperature pressure of slab. The increase in the bond force at the bottom of slab leads to a big rise in the temperature which is required for the crack closure and reduces the temperature pressure loss caused by cracking. To a small extent, the higher the reinforcement ratio is, the higher the longitudinal temperature of the track plate is and the smaller the temperature pressure released by the track plate becomes. State and of slab bottom and reinforcement ratio of slab should be used as important parameters for calculating the temperature pressure of slab.

 

Key words: longitudinal ballastless track; cracks; temperature pressure; load of temperature rise

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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