| This paper designs a layered assembled steel structure beam-column node,which uses the flange plate to strengthen the plastic hinge of the beam end.In addition to the joint beam steel using Q345,other node components such as the column,the core area of the node domain,Q460 steel is used for shear plates.The main research work of this paper is as follows:(1)Combining relevant documents and specifications,a new type of fabricated flange plate reinforced beam-column joint was designed,and the specific component dimensions given were designed and checked,and the bearing capacity of the high-strength bolt friction connection was checked.The coefficients of strong columns and weak beams,the bearing capacity of node domains,etc.,provide corresponding theoretical support for the design of the nodes in this article;(2)Use the software ABAQUS to model the designed "BASE" node,and simulate the seismic action by applying antisymmetric displacement amplitudes to the left and right beam ends to obtain the finite element analysis results.Subsequently,the seismic performance of the "BASE" node was analyzed,and it was found that the designed node can dissipate more energy and the hysteresis curve is more regular and full.Although the overall seismic performance is strong,the ductility performance of the node is weak,and Under larger reciprocating loads,the coordinated forces between the structural members are poor;(3)With flange thickness,frame column thickness,and node core area thickness as variable parameters,three sets of test pieces(three parameters for each set of variables)are designed for analysis and comparison.The most obvious impact on the seismic performance of the node is the frame column.The change of thickness directly reflects the coefficient of strong column and weak beam of the structure;the second is the change of flange thickness,and the least impact is the change of the thickness of the core area of the node domain;(4)Based on the analysis and comparison of the simulation results of the variable parameter test piece,the original design model "BASE" node was optimized.By reducing the thickness of the flange,the thickness of the frame column and the thickness of the core area,the frame column using Q460 steel can be used The H beam of Q345 steel produces proper plastic deformation before failure to increase the overall deformation capacity and energy dissipation capacity of the structure.It is found that after the optimization,the initial stiffness of the joint has been reduced,the ductility of the joint has been improved,the stiffness degradation has been significantly slowed,and the energy that can be dissipated has also been greatly increased. |
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