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

WANG Yihong1,LU Xianjun2,ZHOU Xuhong1,GUO Zenghui1,FU Min1(1.School of Civil Engineering,Chang'an University,Xi'an 710061,China;2.China Railway Engineering Design Insistute(Shenzhen) Co.Ltd,Shenzhen 518048,China)  
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".
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