Experimental study on anti-drawing performance of half-penetrated joint between concrete-filled double steel tube column and steel beam
The pull-out tests were carried out on three kinds of half-penetration joint specimens between concrete-filled double steel tube column and steel beam,including the half-penetration web joint specimen AJ1,half-penetration web-flange joint specimen AJ2,and half-penetration web-diaphragm joint specimen AJ3,and the damage patterns and pull-out properties of the joints were explored.The results show that the bearing capacity of specimen AJ2 and specimen AJ3 is enhanced by 14.2％and 13％than that of specimen AJ1 respectively,which indicates that the transverse anchored component between the inner steel tube and outer steel tube is beneficial to improve the transfer mechanism of tensile force in the joint and significantly increase the tensile strength.In order to further investigate the effect of half-penetrated members on the anti-drawing performance of joint,the pull-out tests of pure steel beam flange joint specimens AJ1-R,AJ2-R,and AJ3-R were conducted.The results show that the ultimate load of the three half-penetrated joint specimens AJ1,AJ2,AJ3 are respectively increased by 60.1％,22.7％,73.8％compared to the pure flange joint specimens AJ1-R,AJ2-R,AJ3-R,and the initial stiffness is increased by about two times.The half-penetrated web is the main force transmitting member,which ensures that the joint has strong load-bearing capacity and tensile rigidity.The half-penetrated flange can directly transfer tension between beams and columns,while half-penetrated diaphragm is conducive to play the role of diagonal axial plate to transfer tension,to achieve comparable load-bearing capacity with the half-penetrated flange,and can better ensure that the concrete densification of the core area and deformation performance of the joint.
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