Analysis On Seismic Behaviors And Parameters Of H-beams To Square Steel Tubular Column Joints Transferring Forces Outside Columns

In recent years,steel frame has been widely used because of its excellent behaviors.One of the important parts of the steel frame is the beam-column joint,which is closely related with the safety and stability of the whole steel frame.Due to the effects of the earthquake disaster,relevant experts and scholars at home and abroad have been devoted to the research on seismic behaviors of steel frame beam-column joints,put forward various improved steel frame beam-column joints,and done a lot of experimental research and numerical simulation analysis.The H-beams to square steel tubular column joints transferring forces outside columns studied in this paper are a kind of improved steel frame beam-column joints,which was put forward based on the reinforcement engineering.To transfer forces outside columns,force-transferring plates are added between the adjacent beam flanges of the square steel tubular column without inner diaphragm in this kind of beam-column joints.The static behaviors of joints with 4 beams of traditional joints,joints without inner diaphragm and joints transferring forces outside columns as well as joints with 3 beams and joints with 2 beams of traditional joints and joints transferring forces outside columns are analysed with ANSYS software in this paper.And then,the results of the analysis and the experiments on static behaviors are compared.Based on the experiments and finite element analysis on the static behaviors of joints,such seismic behaviors as failure patterns,energy dissipation capacities,bearing capacities,ductilities,plastic rotation capacities as well as the strength and stiffness degradation characteristics of joints with 4 beams of traditional joints,joints without inner diaphragm and joints transferring forces outside columns are comparatively analysed.Moreover,joints transferring forces outside columns under the cyclic loading are analysed with ABAQUS software and the results of ABAQUS software and ANASYS software are compared.In addition,finite element analysis models of joints with 4beams of joints transferring forces outside columns are built with ANSYS software to analyse the effects of the width,the thickness and the distance to the column of force-transferring plates on the seismic behaviors of joints.Meantime,the reasonable value ranges of the above parameters are determined.The specific contents of this paper are listed as follows:(1)Force-displacement curves of joints with 4 beams of traditional joints,joints without inner diaphragm and joints transferring forces outside columns as well as joints with 3 beams and joints with 2 beams of traditional joints and joints transferring forces outside columns under the monotonic loading are obtained with ANSYS software.The yield loads and ultimate loads of these kinds of joints are comparatively analysed.The results of the analysis and the experiments on static behaviors are compared.The results show that bearing capacities of joints transferring forces outside columns are a little lower than those of traditional joints and much higher than those of joints without inner diaphragm.Moreover,the reliability of the finite element models and analysis methods is confirmed.(2)Based on the experiments and finite element analysis on the static behaviors,von Mises stress nephograms,force-displacement hysteretic curves,skeleton curves and distributions of stresses of joints with 4 beams of traditional joints,joints without inner diaphragm and joints transferring forces outside columns under the cyclic loading are obtained with ANSYS software.Meantime,such seismic behaviors as failure patterns,energy dissipation capacities,bearing capacities,ductilities,plastic rotation capacities as well as the strength and stiffness degradation characteristics are comparatively analysed.Moreover,joints transferring forces outside columns under the cyclic loading are analysed with ABAQUS software and the results of ABAQUS software and ANASYS software are compared.The results show that bearing capacities,energy dissipation capacities,ductilities and plastic rotation capacities of joints transferring forces outside columns are a little lower than those of traditional joints but are still up to the basic standards of good seismic behaviors.Compared with joints without inner diaphragm,due to the adding of force-transferring plates,such seismic behaviors as energy dissipation capacities,bearing capacities,ductilities and plastic rotation capacities of joints transferring forces outside columns have significant improvements.The results of ABAQUS software and ANSYS software coincide well and the reliability of the finite element models and analysis methods of seismic analysis is confirmed.(3)Finite element analysis models of joints with 4 beams of joints transferring forces outside columns are built with ANSYS software.The force-transferring plates of these joints are of different width,thickness and distance to steel columns.The von Mises stress nephograms,force-displacement hysteretic curves,skeleton curves and the distributions of stresses of these joints under the cyclic loading are obtained.The effects of the width,the thickness and the distance to steel columns of force-transferring plates on such seismic behaviors as failure patterns,energy dissipation capacities,bearing capacities,ductilities,plastic rotation capacities as well as the strength and stiffness degradation characteristics are analysed.Meantime,the reasonable value ranges of the three parameters are determined.The results show that,in order to guarantee joints transferring forces outside columns good seismic behaviors,the width and thickness of force-transferring plates shall be 0.75~1.25 times those of beam flanges and the distance between force-transferring plates and steel columns shall be as small as possible.