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为分析型钢超高强混凝土柱受剪机理,并准确计算其受剪承载力,基于修正压力场理论提出型钢超高强混凝土柱的受剪承载力计算模型。该模型通过柱端部截面中心正应变ε0来考虑轴力、弯矩和剪力的相互作用,并通过关键参数混凝土主压应力角θ和平均纵向应变εx来反映剪跨比、轴力以及配箍对柱受剪承载力的影响。推导出型钢超高强混凝土柱受剪承载力的计算式,并分析其两种剪切破坏形式。通过两组型钢超高强(高强)混凝土柱的低周反复试验结果对该受剪模型进行验证。研究表明:模型能合理考虑轴力、弯矩和剪力的相互作用,反映剪跨比、轴力和箍筋对受剪承载力的影响;模型计算所得受剪承载力与试验值吻合较好。
In order to analyze the shear mechanism of SRC columns and to calculate the shear capacity of SRC columns accurately, the shear capacity calculation model of SRC columns based on modified pressure field theory is proposed. In this model, the interaction between axial force, bending moment and shear force is taken into account by the normal strain ε0 at the center of the cross section of the column, and the shear stress ratio, the axial force and the axial stress Effect of Hoop on Columns Shear Capacity. The formula of shear capacity of SRC columns is deduced and the two forms of shear failure are analyzed. The shear model was verified by the low-cycle repeated test results of two types of ultra-high strength (high-strength) steel columns. The results show that the model can reasonably consider the interaction between axial force, bending moment and shear force, and reflect the influence of shear span ratio, axial force and stirrup on the shear capacity. The calculated shear capacity calculated by the model agrees well with the experimental data .