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根据已有研究成果建立锈蚀钢筋及钢筋—混凝土界面的性能退化模型,采用有限元软件建立分离式钢筋混凝土梁模型,通过试验验证了数值分析结果的准确性。在此基础上,对锈蚀钢筋混凝土梁的受力性能进行了参数分析。结果表明:(1)钢筋锈蚀率对钢筋混凝土梁受力性能影响较大,随着锈蚀率的增加,构件的承载力降低、刚度退化及延性变差;(2)钢筋—混凝土界面粘结力对钢筋混凝土梁承载力影响较小,但会改变构件的破坏模式,随着锈蚀率增加,构件从延性破坏变为脆性破坏。本文研究成果可为锈蚀钢筋混凝土梁加固设计提供参考。
According to the existing research results, the degradation model of corroded steel bar and steel-concrete interface was established, and the separation reinforced concrete beam model was established by finite element software. The accuracy of the numerical analysis results was verified through experiments. On this basis, the parameter analysis of the mechanical behavior of corroded RC beams is carried out. The results show that: (1) Corrosion rate of steel bars has a great influence on the mechanical properties of RC beams. With the increase of corrosion rate, the bearing capacity of the RC members decreases and the stiffness degradation and ductility deteriorate. (2) The bearing capacity of concrete beam has less influence, but it will change the failure modes of the members. As the corrosion rate increases, the members will change from ductile damage to brittle failure. The research results in this paper can provide reference for reinforcement design of corroded RC beams.