In this paper, two joints of circular tubed steel-reinforced concrete (CTSRC) column were designed. The load-displacement hysteretic curve and skeleton curve of this new type of joint are obtained by the pseudostatic test under low cycle cyclic load on the top of the column. The results show that this new type of joint has good seismic energy dissipation performance. On the basis of the test, a three-fold skeleton curve model considering three characteristic points of yield, limit, and failure is proposed, and the expression of skeleton curve model is given. The load and unload stiffness degradation law of specimens under reciprocating load is studied, and the expression of stiffness degradation law is given. The hysteresis law of the new type joint specimens is described in detail. The validity of the model is verified by comparing the experimental curve with the model curve. The model can be used in the elastic-plastic seismic time-history analysis on the joint of circular tubed steel-reinforced concrete (CTSRC) column.

中文翻译：

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圆管钢筋混凝土柱节点恢复力模型研究

在本文中，设计了圆管钢筋混凝土（CTSRC）柱的两个节点。这种新型接头的荷载-位移滞回曲线和骨架曲线是通过柱顶低周循环荷载下的拟静力试验得到的。结果表明，这种新型接头具有良好的抗震耗能性能。在试验的基础上，提出了考虑屈服、极限和失效三个特征点的三重骨架曲线模型，并给出了骨架曲线模型的表达式。研究了往复载荷作用下试件的加载和卸载刚度退化规律，给出了刚度退化规律的表达式。详细描述了新型接头试件的滞后规律。通过实验曲线与模型曲线的对比验证了模型的有效性。该模型可用于圆管钢筋混凝土（CTSRC）柱节点的弹塑性地震时程分析。