Research On The Seismic Performance Of Improved H-steel Beam Column Rigid Joint

In order to improve the seismic performance of steel beam column rigid node and realize the design concept of "strong node and weak member",two methods are generally adopted to weaken beam seismic and strengthen beam column connection.As a new residential industrialization technology,"prefabricated node" can not only improve the construction efficiency and safety,but also reduce the transportation cost,which is the inevitable trend of steel structure in the future.However,the traditional prefabricated node failed to strengthen the beam column connection weld,which may lead to brittle failure of the beam column node.In this paper,an improved H-beam column rigid node is proposed by adding welded beam haunch at the flange of the beam column connection to enhance the seismic performance of the node and combine with the fabricated node.The improved h-beam-column rigid node is taken as the research object,and the new type of node is designed by using the equal strength design method.By changing the thickness of web splice plate,the thickness of flange splice plate and the length of flange splice plate,the influence of these three parameters on the seismic performance of the improved h-beam-column rigid node is studied.The ABAQUS finite element model is established by simulating the seismic wave on the beam end.The stress nephogram,hysteresis curve,skeleton curve,stiffness degradation curve,ductility coefficient and energy dissipation coefficient of each specimen are obtained through the simulation analysis results of the software.Through the comparison and analysis of the above seismic performance indexes,the reasonable range of specimen parameters is obtained.The equivalent strength design method is used to design the traditional specimens and the new node is compared and analyzed.The seismic performance of the two nodes is studied by ABAQUS finite element software.In order to realize the design concept of "strong column and weak beam",two kinds of weakened node are designed based on the improved H-beam column rigid node,which is dog bone weakening node and web opening weakening node.The seismic performance index is obtained by finite element software ABAQUS,and compared with the improved H-beam column stiffness.The changes of seismic performance period around weakening are studied.