| In recent years,fabricated steel structure has gradually become the development trend of construction industry because of its advantages of materials and structures.There are many welding joints,complicated construction and poor seismic performance in the traditional beam column joint,so it is necessary to study the new joint.On the basis of summarizing the research results applicable to the connection of fabricated square steel tubular column and H-shaped steel beam column,this paper puts forward an assembled square steel tubular column-h-shaped steel beam joint with groove connection.Through the combination of the low cycle cyclic loading test and the finite element analysis,the seismic performance of the joints with groove connections is studied,which provides a reference for the research and application of the fabricated beam column joints.The main research work and results are as follows:In order to study the seismic performance of the joint,three full-scale specimens with groove connection were designed,and the length of channel steel and the thickness of cover plate were used as control parameters to carry out the quasi-static test.The failure process and characteristics of each specimen are analyzed.Through the analysis of strain gauge,the yield order of joint is obtained.Based on the analysis of the moment angle curve and test data,the seismic performance index of the joint is analyzed and compared.It is found that the joint is semi-rigid and has good seismic performance,energy dissipation capacity and ductility.On the basis of the test,the finite element software ABAQUS was used to simulate the three test pieces,and the finite element results were compared with the test results.The analysis results show that the finite element results are in good agreement with the test results.By changing the axial compression ratio,the thickness of cover plate and the length of channel steel,the influence of structural parameters on the seismic performance and stress development of joints is studied.The results show that:under the larger axial compression ratio,the plastic area of the joint decreases,the seismic performance of the joint decreases,the column flange will bear greater stress,and the axial compression ratio should be controlled within 0.4;the increase of the thickness of the cover plate has a limited impact on the seismic performance of the joint,so the thickness of the cover plate can be selected to be the same thickness or slightly greater than the thickness of the beam flange;the length of channel steel has a significant impact on the seismic performance of the joint,but the length degree should not exceed 400mm.According to the results of the test and finite element analysis,the connection form of the joint is improved.Under the control of the axial compression ratio,the structural parameters of the joint area are improved,including the increase of the welding area and the length of the channel steel web respectively.The finite element analysis shows that the stress distribution in the joint area is more uniform and the hysteretic performance is still better when the length of the channel steel web is increased further research is carried out to provide reference for the application and design of nodes. |
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