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基于17个型钢再生混凝土组合柱低周反复荷载试验,分析了再生粗骨料取代率、轴压比、体积配箍率以及剪跨比对组合柱水平承载力的影响规律。通过实测型钢腹板与翼缘,箍筋及纵筋的荷载-应变曲线,并结合组合柱的破坏形态特征,分析了型钢再生混凝土组合柱在水平荷载作用下的破坏机理。在此基础上,分别推导了型钢再生混凝土组合柱发生剪切斜压破坏和弯曲破坏时的理论计算公式。为了便于计算,本文提出了型钢再生混凝土组合柱水平承载力实用计算公式。结果表明,组合柱的计算水平承载力与试验值吻合较好,满足计算要求。上述研究结论可为型钢再生混凝土组合柱的抗震设计提供参考。
Based on the low-cycle cyclic loading tests of 17 profiled steel-reinforced concrete composite columns, the influence of recycled coarse aggregate substitution rate, axial compression ratio, volumetric stirrup ratio and shear span ratio on horizontal bearing capacity of composite columns was analyzed. Through the load-strain curves of webs, flanges, stirrups and longitudinal bars, combined with the failure morphology of the composite columns, the failure mechanism of SRC columns under horizontal load was analyzed. On this basis, the theoretical calculation formulas of the reclaimed concrete columns under shear stress and bending failure were deduced respectively. In order to facilitate the calculation, this paper presents a practical formula for calculating the horizontal bearing capacity of steel reinforced concrete composite columns. The results show that the calculated horizontal bearing capacity of composite column is in good agreement with the experimental value, which meets the calculation requirements. The conclusions of the above research can provide references for the seismic design of steel-reinforced concrete composite columns.