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为研究角部钢筋非均匀锈蚀膨胀引发的混凝土保护层开裂行为,提出了角部钢筋的非均匀锈胀模式.并将混凝土视为由骨料、砂浆和界面过渡区组成的三相复合材料,建立了混凝土细观随机骨料模型.以施加非均匀径向位移方式来表征钢筋锈胀对周围混凝土的力学作用.基于该方法对钢筋非均匀锈蚀引发的混凝土保护层开裂行为进行了细观数值模拟,模拟结果与已有文献中试验结果的良好吻合验证了该方法的合理性.另外,对比了宏观均质模型和细观非均质模型下不同角部钢筋锈胀模式导致的混凝土保护层开裂模式;并探讨分析了保护层厚度和钢筋直径对保护层开裂模式以及钢筋锈胀压力的影响规律.
In order to study the cracking behavior of concrete protective layer caused by non-uniform corrosive expansion of corner steel, a non-uniform rust expansion mode of corner reinforcement was proposed and considered as a three-phase composite material composed of aggregate, mortar and interfacial transition zone, The mesomechanical model of concrete is established.The mechanical action of the steel bar on the surrounding concrete is characterized by the application of nonuniform radial displacement.Microscopic values of the cracking behavior of the concrete cover induced by the non-uniform corrosion of reinforcing steel The good agreement between simulation and simulation results and the experimental results in the existing literature verify the rationality of this method.Moreover, the concrete protective layer caused by the steel corroded patterns at different corners under macro-homogeneous model and mesoscopic heterogeneous model Cracking mode. The effects of the thickness of the protective layer and the diameter of rebar on the cracking mode of protective layer and the pressure of rebar expansion were discussed.