Seismic performance analysis of square steel tubular column-H-beam joints with T-shaped steel connection

GONG Jian; LIN Yongle; WANG Xinwu; SUN Haisu; LIU Huanhuan; ZHAO Qi

doi:10.16186/j.cnki.1673-9787.2023080020

Abstract：Objectives In order to study the seismic characteristics of square steel tubular column-H-beam joints connected by one-side bolt and T-shaped steel.Methods The quasi-static test of a 1:2 scale edge joint was carried out by means of indoor testing and numerical simulation analysis.The numerical simula-tion was performed using ABAQUS finite element software to comprehensively analyze the mechanical prop-erties such as hysteresis characteristic bearing capacity,stiffness,and energy dissipation of the edge joint.The variables in the finite element analysis include ribbed T-shaped steel,dog-bone type beam flange,and open round hole type beam web.Results In the test,the joint specimens mainly consisted of T-shaped steel,which participated in energy dissipation,and its deformation was the most pronounced,while the de-formation of beam and column members was minimal.The plastic hinges of such edge joints were mainly concentrated on the T-shaped steel of the connecting member,and stress concentration occured at the junc-tion of the T-shaped steel web and the flange.In the elastic stage of the test,the joint members resisted the external force together.In the plastic stage,the joint damage gradually accumulated in the T-shaped steel,causing it to eventually undergo plastic failure.In the finite element simulation,the configuration of the T-shaped steel ribs had the greatest influence on impact improving the overall bearing capacity of the joints,with the addition of 3#rib configuration resutting in the maximum increase in bearing capcity;the dog-bone type beam flange had the greatest influence on the overall energy dissipation capacity of the joint,in-creasing it by 44.01%.Conclusions Adding ribs to the T-shaped steel significantly improves the bearing ca-pacity and stiffness of the joint,with little effect on the energy dissipation capacity.The energy dissipation capacity of the joints can be improved by the dog-bone beam flange and the open hole beam web,while the bearing capacity and stiffness of the joint remain basically unchanged.Among the three variables,the dog-bone beam flange has the most significant effect on the seismic performance of the joint.