Study On Seismic Behavior Of Box Strengthen-joint Region Connection With Opening On Beam Web For Weak Axis

Northridge(of Northridge)in 1994 in the United States and Japan in 1995 the hanshin earthquake happened twice,it was found that a large number of beam-column welded joint brittle failure,and the beam itself does not have obvious plastic deformation or did not happen.In order to improve the mechanical performance of steel structure of beam-column joints to improve the ductility of the steel frame node and plastic deformation capacity,domestic and foreign scholars began to have a series of research,the traditional steel frame nodes and put forward a new structure form of ductility node.However,scholars at home and abroad the research content is mainly the major axis direction of beam-column joints,of beam-column joints weak axis direction,especially for i-section beam-column joints weak axis of the node force performance study is less.Based on chang an university professor Lou come the node domain box to strengthen weak axis type i-section column connected nodes,on the basis of the finite element software ABAQUS to node domain box weak axis web open groove of mechanical properties is analyzed,and compared with the traditional domain box type weak shaft connection nodes were analyzed,research has shown that in elastic phase node domain box type weak shaft connection open pass web node basic remains the same,stiffness and bearing capacity in the elastic-plastic stage,open groove web node rigidity and bearing capacity is slightly lower,but the node ductility increased significantly,hysteretic curve is full,eventually form plastic hinge in the web to weaken,the offshoring in the plastic hinge,showed a good ability to plastic deformation,is an ideal ductility node type.In order to be able to in the actual steel frame the weak axis adopt the node type,this article USES the finite element analysis software ABAQUS respectively on the box type weak shaft connection node domain and adopt the new web open groove node space steel frame in the form of a more in-depth study.In view of the node domain box type weak shaft connection open pass web node,due to their mechanical properties research is not thorough,in order to better study the node domain weak axis connection open pass web node force performance,first node finite element model is established,by changing the web plate hole center to be on the edge of the pedal distance B and hole radius R,skin thickness,axial compression ratio,strength of steel and the stiffness parameters such as beam line,study of these parameters on the node failure modes,hysteresis property,skeleton curve,ductility,the influence of the bearing capacity.Research results show that the node domain box type weak shaft connection web open groove form plastic hinge node in the web to weaken,realize the offshoring in the plastic hinge,enhance the ductility of node,the node has better than traditional energy dissipation,and gives the web hole weaken parameter range,for the node domain web open pass weak axis connecting nodes of aseismic design provides a certain theoretical basis.Finally,set up the finite element model of space steel frame,the web plate hole center to receive from b and hole radius on the edge of the pedal parameters affect the performance of the force.And to establish a common node space finite element model of steel frame,compared with open groove web node analysis.