The bond-slip damage of the interface between profile steel and concrete is the key point of steel-reinforced concrete structure. This paper is based on the statistical analysis of a large amount of experimental data and the distribution characteristics of bonding stress on the bonding surface of the profile steel and concrete, and the conversion rules between the three parts (chemical bonding force, frictional resistance, and mechanical interaction) of the bond force are obtained. According to the mutual conversion rules of the three parts of the bonding force on the steel-reinforced concrete bonding surface, a mesomechanical model based on the spring-friction block element is established. Taking into account the discreteness of concrete performance on the bonding surface and the randomness of defects, using the stochastic damage theory, a constitutive model of stochastic bonding damage on the steel-reinforced concrete bonding surface is established. The comparative analysis with the results of a large number of steel-reinforced concrete pull-out tests shows that the model can reasonably reflect the damage characteristics of the steel-reinforced concrete bonding surface.

中文翻译：

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钢筋混凝土粘结滑移随机损伤本构关系

型钢与混凝土界面的黏结滑移损伤是钢筋混凝土结构的关键。本文基于大量实验数据统计分析，分析型钢与混凝土结合面结合应力的分布特征，以及三部分（化学结合力、摩擦阻力、机械相互作用）的结合力。根据钢筋混凝土结合面上三部分结合力的相互转换规律，建立了基于弹簧摩擦块单元的细观力学模型。考虑到粘结面混凝土性能的离散性和缺陷的随机性，采用随机损伤理论，建立了钢筋混凝土结合面随机结合损伤的本构模型。与大量钢筋混凝土拉拔试验结果对比分析表明，该模型能够合理反映钢筋混凝土结合面的损伤特征。