Through analysing the stress and deformation of a longitudinally coupled prefabricated track slab (LCPTS) with cracks at high temperature, an analysis model for the stability of LCPTS with cracks was established based on the finite-element method and was tested by a scale model on-site. The effects of crack status on the stability of track slabs under the action of a temperature rise were studied through simulations. The results showed that ∧-shaped cracks can make track slabs suffer an up-warp deformation with an angle at the apex, while ∨-shaped cracks will cause track slabs to have two peaks at both sides of the crack. Cracks of depth 15 cm are most likely to cause track slab up-warp. Oblique non-penetrating cracks with an angle less than 45° were found not to affect the vertical deformation, while penetrating cracks with an angle less than 35° did not lead to yielding of the reinforcing bars or affect the normal operation of track structures. For track slabs with a crack spacing of less than 5 m, the vertical displacement will be affected by adjacent cracks. Therefore, in order to ensure the stability of LCPTS at high temperature, the crack status should be closely monitored.

中文翻译：

---

裂纹状态对纵向耦合预制轨道板稳定性的影响

通过分析带有裂纹的纵向耦合预制轨道平板（LCPTS）在高温下的应力和变形，基于有限元方法建立了带有裂纹的LCPTS稳定性的分析模型，并通过比例模型在以下条件下进行了测试：现场。通过仿真研究了裂纹状态对温度升高作用下轨道平板稳定性的影响。结果表明，∧形裂纹可使轨道板在顶点处发生向上翘曲变形，而∨形裂纹将导致轨道板在裂纹的两侧都有两个峰。深度为15厘米的裂缝最有可能导致轨道平板翘曲。倾斜小于45°的非穿透性倾斜裂纹不会影响垂直变形，而穿透角度小于35°的裂纹不会导致钢筋屈服或影响轨道结构的正常运行。对于裂缝间距小于5 m的轨道板，垂直位移将受到相邻裂缝的影响。因此，为了确保LCPTS在高温下的稳定性，应密切监测裂纹状态。