Study On The Mechanical Behavior Of Beam Column Joints With Flange Reinforced Web Openings

Steel structure has feature of high strength,light weight,uniform material,good plastic deformation and tenacity,easy manufacturing and construction,which make it become more generally preferred in seismic design of buildings.At present,it has been widely adopted in plants,bridges,large-sized industrial equipment and building construction.However,Steel structure buildings have been seriously damaged,resulting in huge casualties and property losses.The advantages of steel have not been fully reflected..American researchers proposed some methods to improve the beam.column welded joint after studying it's situationin the earthquake.The main strategy is shift.Away of plastic hinge(to move the plastic hinge outward from the beam.colulrm interface).To realize that,there are two different ways.One is to reduce the beam sections,another is to reinforce the end of section beam by some construction methods.And there is a way that make former two kinds of joint are used together,so that the bearing capacity and ductility of the joints meet the requirements.In this paper,in view of the structure of this kind of node,the web opening and flange reinforcement are selected and the joint is used,and the local cover plate is strengthened by the flange of the root of the beam root of the web.Moreover,a series of mechanical behaviors of the joints are analyzed.The contents of this article mainly include the following aspects:Firstly,we design something about beam web opening a hole,in this case,we make a,analysis of the stress performance of beam column joints under this structure under unidirectional loading,and the influence of aperture size and opening distance on the mechanical properties of the joints.From the analysis,we can get the law of formation and development of the constitutive relation curve and plastic hinge.And under the same conditions,the wing flange reinforced web opening joints are established,so that we can compare the similarities and differences between the twoSecondly,we study some important parameter including control of the size of the opening of the web,thickness of cover plate,opening distance,so that we can figure out these parameter how to influence the joint.And because of the local strengthening,the bearing capacity of the node is reduced to a certain extent.Only influence the area near the opening.The diameter of the hole is R and the opening distance is A,and the thickness of the cover plate is B as the main analysis object.In the end,For reinforced joints,web openings joints,and parameters optimized joints,we do the same experiment so that we can compare the advantage and disadvantage.