锈蚀钢筋混凝土梁受力性能研究

Mechanical Analysis of Corroded Reinforced Concrete Beams

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。

A discrete finite element model was built using finite element software,which was proved appropriate for the analysis of mechanical behavior of corroded reinforced concrete beams when combined with the degradation model of corroded steel bars and steel-concrete interface through available research results. Further parametric analysis was carried out to investigate the mechanical behavior of corroded reinforced concrete beams. The results show that： （1） the corrosion rate greatly affects the ultimate bearing capacity ; the ultimate bearing capacity, stiffness and ductility will decrease with the increase of corrosion rate ; （2） the bond stress has little effect on the ultimate bearing capacity, but it greatly affects the failure mode. The beam may be transformed from ductile failure to brittle failure with increasing corrosion rate. These conclusions can be referred to in the rehabilitation design of corroded reinforced concrete beams.