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为研究CRTSⅡ型板式无砟轨道在系统升温及温度梯度共同作用下的温度变形特征及损伤失稳机理,采用有限元分析手段,建立连续12块板总长度约80 m的轨道结构理论分析模型,提出接缝处的钳口形受力机制,并分别对窄接缝均匀和不均匀损伤条件下轨道结构的温度变形特征进行计算分析。结果表明:钳口效应将加速窄接缝的压溃;不同的接缝损伤工况组合引起不同形态的轨道结构变形;板端偏压力线上移进入宽接缝内容易导致板端劈裂。
In order to study the temperature deformation characteristics and damage instability mechanism of CRTS Ⅱ slab track under the system temperature and temperature gradient, 12 theoretical models of orbital structure with a total length of about 80 m were established by means of finite element analysis. The mechanism of the jaw-shaped force at the joint was proposed and the temperature deformation characteristics of the track structure under uniform and uneven narrow joints were calculated and analyzed respectively. The results show that the jaw effect will speed up the crushing of the narrow joint. Different combinations of the joint damage conditions cause the deformation of the rail structure in different forms. The displacement of the biasing pressure line on the plate end into the wide joint can lead to the splitting of the plate end.