Investigations On H-shaped Beam-steel Square Tube Column Angle Connection With Composite Bolts Under Bending Moment

With the wide application of the closed-section steel tube column in engineering structures,the connection of tube column and steel beam has been a hot topic in the field of structural engineering.In addition,the semi-rigid joint of steel structure frame has gradually become the favorite in the engineering research field.In order to combine the advantages of steel tube column and semi-rigid joint,this paper put forward the joint of square steel tube column and H-beam angle bolted by composite bolt,which meant the connection between square steel tube column and angle connected by through-column bolt,and the connection of angle and H-beam connected by high-strength bolt.In this paper,three kinds of joint of square steel tube column and H-beam angle bolted by composite bolt are proposed,which are the joint of square steel tube column and H-beam angle bolted with no stiffener,the joint of square steel tube column and H-beam angle bolted with stiffener and the joint of square steel tube column and H-beam angle bolted with stiffener and web bi-angle.By means of Finite Element Model numerical analysis,the joint of square steel tube column and H-beam angle bolted by composite bolt were studied.The model adopted solid elements and considered geometric nonlinearity,contact nonlinearity and large geometric deformation.In this paper,the simulation analysis of similar joints was carried out by means of indirect verification,and the model was verified by comparing the stress-strain development history,failure modes,components deformation and bending moment-rotation curves in the Finite Element Model and test results.In this paper,the static bending behavior of the joint of square steel tube column and H-beam angle bolted by composite bolt was analyzed in many parameters,including whether to set stiffener plate in angle,the position of stiffener plate,the shape of stiffener plate,the number of stiffener plate,the material property of stiffener plate,the thickness of stiffener plate and whether to set web di-angleBased on the results of Finite Element Model analysis,the stress analysis of the joint of square steel tube column and H-beam angle bolted with no stiffener,the joint of square steel tube column and H-beam angle bolted with stiffener and the joint of square steel tube column and H-beam angle bolted with stiffener and web bi-angle was carried out.According to the yield line theory and its models suggested in Eurocode 3 and P398,the tensile bearing capacity of unstiffened angle and stiffened angle was calculated.At the same time,combined with the Finite Element Model analysis results,the position of joint rotation axis of the joint of square steel tube column and H-beam angle bolted with no stiffener and the joint of square steel tube column and H-beam angle bolted with stiffener was determined and the corresponding calculation diagram were proposed.By comparing the theoretical calculation results with the Finite Element Model analysis results,it can be found that the theoretical calculation results were in good agreement with the Finite Element Model results.