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基于桁架-拱模型对钢筋混凝土柱受剪机理进行研究,分析了压弯荷载作用下钢筋混凝土柱抗剪承载力组成及其计算方法。分别计算混凝土裂缝间骨料咬合作用、箍筋及拱作用的抗剪承载力贡献,同时考虑柱抗剪承载力随延性增长而降低的特性,建立基于延性的钢筋混凝土柱抗剪承载力计算公式。通过与收集的68根柱剪切破坏试验数据以及其他抗剪承载力计算模型的比较,验证了本文模型的可靠性和适用性。
Based on the truss-arch model, the shear mechanism of reinforced concrete columns is studied, and the shear strength of reinforced concrete columns under compression-compression load and its calculation method are analyzed. The contribution of the shear stress, the effect of aggregate bracing, the effect of stirrups and arches on the concrete frac- tures, respectively, are calculated. Considering the characteristics of shear strength decreasing with increasing ductility, the formula for calculating the shear strength of reinforced concrete columns based on ductility is established . The reliability and applicability of this model are verified by comparison with the collected 68 shear failure test data and other calculation models of shear strength.