锈蚀钢筋混凝土受弯构件抗弯承载力评估

Assessment of Flexural Capacity of Corroded Reinforced Concrete Members

通过对比锈蚀钢筋混凝土受弯构件与正常受弯构件在抗弯承载力方面的不同,提出了一种计算锈蚀受弯构件抗弯承载力的方法。该方法全面考虑了锈蚀钢筋混凝土受弯构件中混凝土强度的变化、钢筋截面面积的减少以及钢筋与混凝土之间黏结性能的退化等影响承载力的关键因素。通过引入钢筋应变滞后系数考虑黏结性能退化的影响,分析了77组锈蚀受弯构件抗弯的试验数据,建立了钢筋应变滞后系数与钢筋锈蚀率的关系。利用此关系,可以较为准确地计算锈蚀率不大于8%的锈蚀钢筋混凝土受弯构件的抗弯承载力。

A calculation method was presented to get the flexural capacity of corroded reinforced concretemembers. To consider the difference between the corroded and normal reinforced concrete flexural members,the key factors such as the change of concrete strength, the decrease of effective area of reinforcing bar and thebond strength degradation between reinforcing bar and concrete were introduced in the method. A parameternamed as strain hysteresis coefficient has been taken into account to reflect the bond strength degradationbetween reinforcing bar and concrete. Through the analysis of 77 groups test data of corroded reinforcedconcrete members under bending moment, the relationship between the strain hysteresis coefficient andcorrosion rate was established. According to the presented strain hysteresis coefficient, the change of concretestrength and the loss of reinforcing bar sectional area, the flexural capacity of corroded reinforced concretemembers with corrosion rate less than 8% can be calculated accurately.