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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第12期    总第256期    2015年12月

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文章编号:1672-7207(2015)12-4707-06
基于能量准则的Ⅱ型板式轨道稳定性
杨俊斌,曾毅,刘学毅,代丰,任娟娟

(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)

摘 要: 采用界定结构平衡准则中的能量变分原理推导Ⅱ型轨道板竖向稳定性的临界力计算公式,并通过数值分析方法验证该公式的正确性;基于本文推导的临界力计算公式,计算Ⅱ型轨道板的最不利波长及不同变形波长下轨道板的临界力,将临界力对应的轨道板容许升温幅度与轨道板的实测升温幅度进行比较。研究结果表明:Ⅱ型轨道板容许升温幅度远大于轨道板实测升温幅度,因此,Ⅱ型轨道板在温度压力作用下丧失稳定性的可能性很小。

 

关键字: 能量变分;Ⅱ型轨道;稳定性;临界力;容许升温

Stability of CRTS-Ⅱ slab track based on energy norm
YANG Junbin, ZENG Yi, LIU Xueyi, DAI Feng, REN Juanjuan

MOE Key Laboratory of High-speed Railway Engineering of Ministry of Education,
Southwest Jiaotong University, Chengdu 610031, China

Abstract:Using the energy variation principle of the norms to define the structural equilibrium, the computational formula of the critical force for the vertical stability of Chinese railway track system (CRTS)-Ⅱ slab track was deduced. The correctness of the formula was verified by the numerical analytical method. Based on the derived computational formula for the critical force, the allowable temperature-rising amplitudes of the slab were calculated under the condition of the CRTS-Ⅱ slab track with the most detrimental chord length or several variational chord lengths. The allowable temperature range of the critical force was compared with the actual temperature range of track slab. The results show that the allowable temperature-rising amplitude for the CRTS-Ⅱ track slab is much larger than the measured value. Consequently, the CRTS-II track slab, under the temperature pressure, is less likely to lose stability.

 

Key words: energy variation; CRTS-Ⅱ slab track; stability; critical force; allowable temperature rising

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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