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基于6根试验柱在既定轴力下的低周往复加载试验数据、滞回曲线及各阶段的柱顶水平荷载和位移,以峰值荷载点为基准,将试件的骨架曲线拟合为三线段,确定了试件屈服点、极限点与峰值点的关系,根据荷载达峰值时的柱顶水平位移及截面平衡条件推导出了峰值荷载的计算公式;对试验结果进行分析,得到了极限位移、峰值荷载对应位移与核心区纵筋配筋率、核心区面积比及配箍特征值的线性公式;结合试件的滞回规律构建了高强混凝土加芯柱的恢复力模型,并将计算滞回曲线与试验值进行了对比。结果表明:拟合的骨架曲线特征点的计算方法具有较高的精度,构建的恢复力模型与高强混凝土加芯柱的试验滞回曲线吻合较好。
Based on the low cycle reciprocating loading test data, the hysteresis curve and the horizontal loads and displacements at the top of each column of six test columns under the given axial forces, the skeleton curves of the test pieces are fitted to the three-line segments based on the peak load point , The relationship between the yield point and the peak point of the specimen was determined, and the formula of peak load was deduced according to the horizontal displacement of the top of the column and the equilibrium conditions of the section when the peak value of load was reached. The experimental results were analyzed and the limit displacement, And the linear formula of the reinforcement ratio of the longitudinal reinforcement, the ratio of the core area and the characteristic value of the hoop in the core, and the hysteresis law of the specimen, a restoring force model of the core-added composite high-strength concrete is established, The curve is compared with the experimental value. The results show that the fitting method of the characteristic points of the skeleton curve has high precision and the restoring force model is in good agreement with the experimental hysteresis curve of the high-strength concrete columns.