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以位移控制加载,进行了锈蚀钢筋混凝土梁的四点受弯加载试验。增大部分试件箍筋的间距,以研究严重锈蚀后箍筋剩余量较少情况下锈蚀钢筋混凝土梁的承载机理和破坏模式。通过纵筋的应变分布,计算各加载水平下纵筋与混凝土之间的粘结应力。试验表明,随着纵筋和箍筋的锈蚀,剪跨区域的平均粘结应力达到最大值后逐渐减小;锚固区域的平均粘结应力逐渐增大。锈蚀钢筋混凝土梁的承载机理为梁效应向拱效应转化过程中的复合梁拱效应状态,其转化程度取决于纵筋的锈蚀率和箍筋的剩余量。根据梁拱效应转化的程度,提出锈蚀钢筋混凝土梁承载机理的判断流程图。
With displacement control loading, four-point bending load test of corroded reinforced concrete beam was carried out. The spacings of the stirrups in some specimens were increased to study the bearing mechanism and failure mode of the corroded RC beams with less residual stirrup after severe corrosion. Through the strain distribution of longitudinal reinforcement, the bond stress between the longitudinal reinforcement and concrete at each loading level is calculated. Experiments show that with the longitudinal reinforcement and stirrup corrosion, the average bond stress in the shear-span area reaches a maximum and then decreases gradually. The average bond stress in the anchorage area gradually increases. The bearing mechanism of corroded RC beams is the composite beam arch effect during the conversion from beam effect to arch effect. The degree of transformation depends on the corrosion rate of longitudinal reinforcement and the remaining amount of stirrups. According to the degree of beam arch effect transformation, the judgment flow chart of bearing mechanism of corroded reinforced concrete beam is proposed.