受腐蚀钢筋混凝土梁截面延性研究

研究了受腐蚀钢筋混凝土梁的延性特性，分析了受腐蚀梁截面曲率延性系数随钢筋锈蚀率及混凝土劣化系数的演变规律，推导了钢筋与混凝土间粘结退化时受腐蚀梁截面曲率延性计算模型。研究表明，拉压区钢筋在锈蚀初期将导致受腐蚀梁截面曲率延性的提高，但随着钢筋锈蚀率的提高，钢筋与混凝土粘结性能逐渐退化，截面曲率延性系数逐渐降低；混凝土力学性能的劣化作为影响受腐蚀构件延性特性另一主要因素，在受腐蚀钢筋混凝土构件的受力研究中不容忽略。为受腐蚀钢筋混凝土构件受力研究及可靠度评价提供了理论依据。

Study on ductility of corroded reinforced concrete beam

Ductile characteristics of corroded reinforced concrete beam were studied. Effects of rebar corrosion ratio and concrete degradation ratio on the curvature ductility of beam were analyzed. Numerical model for simulating the curvature ductility of corroded reinforced concrete beam in the process of degradation of bond strength between rebar and concrete was derived. It is found that the curvature ductility increases with the increase of rebar corrosion ratio, but if the increase of rebar corrosion ratio leads to severe degradation of the bonding strength the curvature ductility will decrease. It can be also concluded that concrete degradation must be taken into account in the study on mechanical property of corroded reinforced concrete beam.