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为了给连续配筋混凝土路面的材料设计与裂缝控制研究提供理论依据与参考,并探讨道路早期行为与路用性能之间的因果关系,建立了基于有限元的早期行为预测及评价路面路用性能的计算模型。该模型考虑了混凝土材料性质的时间效应、蠕变特性以及钢筋与混凝土的界面效应等,重点分析了混凝土骨料、抗拉强度变异系数、纵向配筋率、钢筋层位置、钢筋与混凝土粘结-滑移关系以及基层类型等对裂缝宽度、裂缝间距与冲断破坏行为规律的影响。结果表明:选用低膨胀率、低干缩、低弹性模量的混凝土材料,保证混凝土抗拉强度的均匀,采用摩阻系数低的基层材料等都有利于获得良好的路用性能;利用非线性钢筋混凝土界面粘结-滑移模型或考虑极限滑移关系,预测发生冲断破坏的可能性较低。
In order to provide theoretical basis and reference for material design and crack control of continuous reinforced concrete pavement, and to explore the causal relationship between early behavior and road performance of road, the early behavior prediction based on finite element method and evaluation of pavement performance The calculation model. The model considers the temporal and creep properties of concrete materials and the interfacial effect between concrete and reinforced concrete. Emphatically analyzes the concrete aggregate, coefficient of variation of tensile strength, longitudinal reinforcement ratio, reinforcement layer position, bond between steel bar and concrete - slip relationship and the types of grassroots on the crack width, crack spacing and the impact of rupture behavior. The results show that the selection of low expansion rate, low shrinkage, low modulus of elasticity of concrete materials to ensure uniform tensile strength of concrete, the use of low friction coefficient of grass-roots materials are conducive to obtain good road performance; use of nonlinear Reinforced concrete interfacial bond-slip model or consider the limit slip relationship, the prediction of the possibility of rupture damage is low.