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Effect of thermal stresses on mid-slab cracking in dowel jointed concrete pavements

机译：热应力对榫接混凝土路面中板裂缝的影响

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摘要

Mid-slab cracking is considered to be one of the main causes of pavement deterioration and enormous funds are spent each year on repairing and maintaining cracked pavements. In this study, a nonlinear three-dimensional finite element (3DFE) analysis, which includes detailed consideration of slab constraints by dowel bars, is used to analyse the problem of premature transverse cracking in jointed concrete pavements. The 3DFE model response to ambient temperature variations is validated versus field-measured data obtained from instrumented concrete slabs constructed in Goshen Road near Morgantown, West Virginia, USA. The modelling results indicate that the combination of ambient temperature drop and slab curling induces slab constraints that lead to the development of mid-slab transverse cracks. The slab length is shown to be a critical parameter that governs the magnitude of the maximum thermal stress induced at maximum mid-slab. It is shown in this paper that 4.57 m is the optimal slab length to avoid mid-slab cracking, a conclusion that agrees with recent observations obtained from the analysis of LTPP (Long Term Pavement Performance).
机译：中板开裂被认为是路面恶化的主要原因之一，每年花费大量资金来修理和维护开裂的路面。在这项研究中，使用非线性三维有限元（3DFE）分析（其中详细考虑了销钉对平板约束的影响）来分析连接混凝土路面中的过早横向裂缝问题。相对于从在美国西弗吉尼亚州摩根敦附近的Goshen路建造的仪器化混凝土板获得的实测数据，对3DFE模型对环境温度变化的响应进行了验证。建模结果表明，环境温度下降和板坯卷曲的组合会引起板坯约束，从而导致板坯中部横向裂纹的发展。板坯长度显示为决定最大板坯中间最大热应力大小的关键参数。本文表明，4.57 m是避免中间板开裂的最佳板长，这一结论与最近从LTPP（长期路面性能）分析获得的观察结果一致。

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