Experimental and Finite Element Study on the Seismic Behavior of CFST Composite Column to H-section Steel Beam Joint with Outer Sleeve
Using concrete-filled steel tubular(CFST)composite column as the research object,a through high-strength bolts connecting beam-column joint with outer sleeve is designed in this paper.In order to study the seismic performance and failure mechanism of this new joint,three joint quasi-static tests with scale ratio of 1:2 were carried out.The damage process and failure mode were observed,and the hysteretic curves,skeleton curves of load-displacement,joint ductility and energy dissipation capacity were analyzed.A finite element(FE)model using ABAQUS software was established to study the effects of width-thickness ratio of sleeve and reinforced rib thickness on the seismic performance of the joint.The experimental and FE results show that the hysteretic curves of the joint are plump.The ductility coefficient is between 3.13～4.19.The equivalent viscous damping coefficient is between 0.211～0.296.The deformation and energy dissipation capacity of the joint panel zone are acceptable.With the increase of sleeve thickness,the cracking of concrete in core area decreases,and the failure section is moved from joint to beam section.Increasing reinforced rib thickness and reducing width-thickness ratio of sleeve can effectively improve the joint stiffness.It is recommended that width-thickness ratio should not be greater than 25 and reinforced rib thickness should not be less than beam flange thickness for meeting the joint stiffness requirements.
万方数据
维普
