| In recent years,steel structures have been widely used in practical engineering due to their unique performance advantages and environmental protection characteristics.As the central hub of the structure,the steel structure joint directly affects the safety performance of the structure.Because of the importance and complexity of the steel structure joint,it has been paid much attention and studied by experts and scholars in the academic circle.The application of square tubular rectangular columns in steel beam-column joints can obviously improve the torsional capacity of components and lateral stability of the structure,which has a higher safety coefficient of the structure.Under the condition of the same section area,the section of rectangular steel tube has better mechanical performance.With the maturity of assembling and installing technology and the improvement of People’s pursuit of building shape,the rectangular column frame joints with regular shape are widely used in steel structures.The traditional rectangular column-H-shaped steel beam frame joint is connected by the inner curtains welded in the column and the outer beam flanges of the column to bear the external load.In practical engineering,in many cases,it is necessary to expand or reinforce the steel structure to meet the requirements of safety and applicability.At this time,the structure has been installed,and the joints can only be improved by means of external reinforcement to meet the actual engineering needs.In this paper,the mechanical properties of rectangular column-H-shaped beam steel frame joints with loading-transfer angle steel between adjacent beams are studied by ABAQUS finite element software.On this basis,the thickness,width and spacing of loading-transfer angle steel are used as three variables to analyze the performance of the joints in different parameters.The main working contents in this paper are as follows:Firstly,the mechanical properties of the traditional joints with inner curtains,joints without inner curtains,joints with loading-transfer angle steel are compared and analyzed.The comparative analysis results show that the rectangular column-H-shaped steel beam joint with loading-transfer angle steel has higher bearing capacity and joint stiffness,and the stress at the weld of the joint flanges and the horizontal deformation of the rectangular column wall are significantly reduced.The reason is that the stress is transferred to the section of the outer beam outside the column.Under the low cyclic load,the joints with loading-transfer angle steel generate obvious plastic hinges at the cross section of the outer beam outside the column,which has good energy dissipation capacity.Secondly,the parameter analysis of the three variables of the joint with loading-transfer angle steel is carried out.The results of parametric analysis show that with the increase of the edge thickness and width of the angle steel,the bearing capacity and energy dissipation capacity of the joint increase in different degrees,the stress in the weld area and the horizontal deformation of the column wall decrease in different degrees,and the plastic deformation capacity decreases.With the increase of the distance between the loading-transfer angle steel and the rectangular column,the bearing capacity and energy dissipation capacity of the joint are basically not significantly different.The stress in the weld area of the joint and the horizontal deformation of the rectangular column wall show a significant growth trend,and the plastic deformation capacity to a certain extent is improved.Finally,the appropriate value range of the side thickness,width and distance from the rectangular column is proposed,which provides a slight reference for the research and application of the external force transmission joint of the rectangular column. |
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