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为研究圆钢管再生混凝土柱的恢复力模型,以再生粗骨料取代率、含钢率、长细比和轴压比为变化参数,对10个试件进行拟静力试验。实测试件的滞回曲线,综合采用了固定点、位移幅值荷载突降、软化点曲线等多种特殊处理手段,在试验实测的滞回曲线的基础之上,结合本文建立的骨架曲线模型和卸载刚度两要素,建立了低周反复荷载作用下圆钢管再生混凝土柱试件的恢复力模型。研究结果表明:试件的滞回曲线饱满度良好,滞回曲线的形状从前期到后期发生了较大的变化,骨架曲线的下降段平缓延伸,试件延性较好,变形性能较强。建立的三折线恢复力模型精度良好,建议可用于圆钢管再生混凝土构件的弹塑性地震反应分析之中。
In order to study the restoring force model of recycled concrete column with round steel tube, ten specimens were subjected to quasi-static test based on the parameters of recycled aggregate replacement rate, steel content, slenderness ratio and axial compression ratio. The hysteresis curve of the test piece is measured. Based on the measured hysteresis curves, the skeleton curve model established in this paper is used in combination with the special treatment methods such as the fixed point, the sudden change of the load amplitude and the softening point curve, And unloading stiffness, the restoring force model of the concrete-filled circular steel tube column specimen under low cyclic loading was established. The results show that the hysteresis curve of the specimen has a good plumpness, the shape of the hysteresis curve changes greatly from the previous period to the later period, and the descending section of the skeleton curve extends slowly. The ductility of the specimen is good and the deformation performance is strong. The establishment of the tri-fold line restoring force model with good accuracy, it can be used for the analysis of the elasto-plastic seismic response of recycled concrete members with circular steel tubes.