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基于型钢再生混凝土组合柱低周反复荷载试验,提出了可考虑组合柱开裂点、屈服点、峰值点以及极限点的骨架曲线计算模型,采用回归分析和理论推导相结合的方法确定了该计算模型中各特征点参数值和折线刚度值计算公式。在此基础上,结合组合柱的刚度特征和滞回特性,给出其刚度退化规律、卸载刚度计算公式以及相应的滞回规则,并建立了型钢再生混凝土组合柱四折线恢复力模型。结果表明,计算骨架曲线与试验骨架曲线吻合较好,该四折线恢复力模型较好地反映了组合柱在低周反复荷载下的恢复力特性和受力特征。
Based on the low-cycle cyclic loading test of profiled steel-reinforced concrete composite columns, the framework curve calculation model which can consider the cracking point, yield point, peak point and limit point of composite columns is proposed. The calculation model is established by the combination of regression analysis and theoretical derivation In each feature point parameter value and line stiffness formula. On the basis of this, combined with the stiffness characteristics and hysteretic characteristics of the composite columns, the stiffness degradation formula, unloading stiffness formula and corresponding hysteretic rules are given. The restoring force model of 4-fold line of steel reinforced recycled aggregate concrete columns is established. The results show that the calculation of the skeleton curve is in good agreement with the experimental skeleton curve, and the four-fold line restoring force model well reflects the restoring force characteristics and the force characteristics of the composite column under the cyclic low cyclic loading.