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钢筋混凝土柱在地震作用下发生弯剪破坏或剪切破坏,是结构丧失轴向承载能力甚至突然倒塌的重要原因。大量的试验研究显示钢筋混凝土柱总侧向变形由弯曲变形、粘结-滑移变形、剪切变形三种变形分量组成,这三种分量的共同作用决定了钢筋混凝土柱的受力变形反应。该文基于对构件变形分量研究,提出考虑粘结-滑移与剪切作用的钢筋混凝土柱侧向变形的宏单元模型。该模型模拟了静力反复荷载下的3个钢筋混凝土柱的试验模型,并对构件受力过程中各变形分量的变化以及各分量在总变形中的贡献进行了分析。结果表明该模型可以较准确的模拟水平荷载作用下剪切控制构件的受力变形反应全过程。
Bending shear failure or shear failure of reinforced concrete columns under earthquake action is an important reason for the loss of axial load bearing capacity or sudden collapse of the structure. A large number of experimental studies have shown that the total lateral deformation of reinforced concrete columns is composed of three deformation components: bending deformation, bond-slip deformation and shear deformation. The combined action of these three components determines the deformation reaction of reinforced concrete columns. Based on the study of component deformations, a macro-element model of lateral deformation of reinforced concrete columns with bond-slip and shear is proposed. The model simulates the experimental model of three RC columns under static repeated loading and analyzes the changes of the deformation components and the contribution of each component in the total deformation. The results show that the model can accurately simulate the whole process of stress-induced deformation of shear control members under horizontal load.