芯钢管连接的钢管混凝土半连通角节点试验研究

提出一种芯钢管连接的钢管混凝土柱与钢筋混凝土梁的新型节点形式。在钢筋混凝土梁与钢管混凝土柱连接区,局部间断钢管混凝土柱的外钢管,设置芯钢管连接上下钢管混凝土柱,使钢筋混凝土梁中的钢筋直接伸入节点,节点混凝土与梁中混凝土成为整体,简化了节点构造,保证了节点刚度。通过半连通角节点模型试验,研究了节点试件的破坏过程、破坏形态、节点区各组成部分的荷载-应变关系。研究表明,芯钢管混凝土对节点强度、刚度有重要作用。试件破坏是由梁和柱的破坏引起,直至试件达到极限状态,节点尚未破坏,证实了这种节点的可行性,且满足"强柱、弱梁、节点更强"的抗震设计原则。

Experimental study on semi-connected corner joint with core steel tube in concrete filled steel tubular

A new type of concrete-filled steel tube(CFST) column-RC beam joint which is connected by the core steel tube is presented.In the CFST column-RC beam connecting zone,the out steel tube of CFST column locally broke off,and the longitudinal reinforcing bars in RC beam stretched into the joint.The concrete was monolithically cast in the region of the beam,the column and the joint.The construction of joint was simplified and the joint stiffness is strengthened.The failure process,the failure formation and the load-strain relation of the members of specimen were studied by the model test of semi-connected corner joint.The studies show that the core steel tube have important effect on the stiffness and strength of the joint.The joint did not fail when the specimen was in limit state,while the beam and the column were damaged.The feasibility of the joint in the static load was proved.The joint meets the seismic design principles "strong column,weak beam,stronger joint".