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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。
By comparing the difference of flexural capacity between corroded RC members and normal flexural members, a method to calculate the flexural capacity of corroded RC members is proposed. The method fully considers the key factors affecting the bearing capacity, such as the change of concrete strength, the reduction of the cross-sectional area of steel bars and the degradation of the bond performance between the steel bars and the concrete, in the corroded reinforced concrete flexural members. By introducing the strain hysteresis coefficient of rebar considering the influence of the degradation of bond performance, the experimental data of 77 groups of corroded flexural members were analyzed and the relationship between the strain hysteresis coefficient and the corrosion rate of rebars was established. Using this relationship, the flexural capacity of corroded RC flexural members with a corrosion rate no greater than 8% can be calculated more accurately.