Study On Mechanical Behavior Of Stainless Steel Column To Column Flange Connection With Crimped Groove Section

In recent years,with the further promotion of the strategy of becoming a maritime power,the problem of structural corrosion resistance has gradually increased,and the stainless steel structure is the best scheme suitable for the highly corrosive environment.At the same time,because of its beautiful and convenient characteristics,the inner flange connection joint is widely used in the single pipe tower structure,but it is rarely used in the field of construction engineering.Whether the bearing performance of the inner flange connection joint meets the design requirements of "equal strength" has not been verified.Based on the above background,in order to enrich the existing forms of flange connection joints,this paper takes the stainless steel column column column flange connection joints with crimped groove section as the research object,and studies the static performance of column column flange connection joints in the following four aspects through experiments and finite element simulation.(1)Through the static loading test on four full-scale specimens of column column inner flange connection joints without considering the floor action,the mechanical properties of large column large column and small column small column joints loaded along the strong axis and weak axis respectively were studied,the failure process and test phenomenon of each group of joints were observed,the failure mode of the joints was analyzed,and the moment displacement,moment rotation curve,flange plate strain distribution diagram and bolt tension change curve of each group of specimens were drawn.。(2)Through ABAQUS software,four groups of finite element models of column column flange connection joints without considering the floor action are established.The contact relationship,element type,mesh division,boundary condition setting and loading system in the modeling process are introduced in detail.The static test results are compared with the simulation results of the finite element model to verify the rationality of the numerical analysis model。(3)On the basis of the test and finite element study of the flange joint without considering the floor action,the flange joint with considering the floor action is proposed,and the finite element model of the flange joint with considering the floor action is established.The calculation results are compared with the test and finite element results of the joint without considering the floor action.The research shows that the mechanical performance of the joint has been significantly improved after considering the floor action,The failure mode of the joint is that the buckling deformation of the upper channel steel column is too large to continue bearing,which realizes the design requirements of "strong joint and weak member" 。(4)The parameter analysis of flange connection joints considering the action of floor slab is carried out,and six groups of models are established.The effects of column top axial pressure,bolt preload,initial clearance between upper and lower flange plates,flange plate thickness,steel column thickness and bolt spacing on the bearing performance and initial rotational stiffness of the joints are discussed.The results show that the preload of high-strength bolts,the gap between flange plates and the thickness of flange plates have little influence on the bearing performance of flanged joints considering the action of floor slab,and the thickness of steel column is the key factor affecting the bearing performance of joints;The initial clearance and thickness of flange plate have a great influence on the initial rotational stiffness of the joint。...