芯钢管连接的钢管混凝土中柱节点试验研究

Test on Discontimious Connection of Concrete Filled Tube in Middle Column Joints

提出了钢管混凝土结构的新型节点 ,这种节点将钢管混凝土柱的钢管在节点区间断 ,用节点区密排环形钢箍、竖向短筋和芯钢管来保证钢管混凝土柱在节点的连续性 ,梁中的纵筋在节点中连续 ,梁与节点区混凝土成为一体 ,能可靠传递梁中的弯矩、剪力及轴力 ;通过三个节点模型试验结果验证了新型节点的构思在概念上是正确的 ,试件的梁、柱破坏先于节点。主要分析了试验现象、破坏机理 。

A new type of column-beam joint of concrete filled steel tubular(CFST) is presented. In the joint zone, the column of CFST is disconnected. The ring and vertical short steel bars, which are closely packed in the joint zone and the core steel tube, can keep a good feature of continuity of CFST in the joint zone.The three models experiment confirms that the failure of the beam and column is earlier than the joint. The phenomenon of experiment and the mechanism of failure, and the problems of further researching are presented.