Study On Axial Bearing Capacity Of Stainless Steel Core L-shaped Wall

The stainless steel core L-shaped wall is an L-shaped cross-member composed of a flange wall limb and a web wall limb.Each wall limb consists of two stai nless steel panels and orthogonally arranged stainless steel core tubes.The connection between the core tube and the panel is brazed.Stainless steel core L-shaped wall is a new type of original component that combines the advantages of both stainless ste el and honeycomb sandwich panels:lightweight,high load carrying capacity,corrosion resistance,short construction period.And it has more significant advantages than traditional components.The stainless steel core L-shaped wall is used for the building structure,which can avoid the exposed beams and pillars,so that the interior of the house structure can be beautiful and flat while reducing the cost.Its model design,standardized production,construction and other advantages,in line with the nationa l green building concept,has a non-negligible development prospects.However,at present,there are very few studies on the L-shaped wall of stainless steel core plates at home and abroad.The stress performance,failure mode and bearing capacity of the L-shaped wall of stainless steel core plates are all in an unknown state,which limits the use and development of stainless steel core plates.Therefore,this paper studies the stable bearing capacity of stainless steel core L-shaped wall under axial compression.The main work contents are as follows:(1)A review of a large number of literatures,combing the research status and application of stainless steel,sandwich structure and special-shaped columns at home and abroad,and put forward the significance of this paper.(2)Through the axial compression test of three sets of stainless steel core L-shaped wall specimens,the test phenomena and failure modes were observed.The load-displacement curves and load-strain curves of the specimens were studied.(3)Using ABAQUS finite element software,reasonable meshing and unit selection were carried out,and the model was built.The axial compression test of the L-shaped wall of stainless steel core plate was simulated,and the load-displacement curve and failure mode of the model were obtained.The accuracy of the model built.On this basis,combined with the test,the force mechanism and failure mode of the L-shaped wall of stainless steel core plate under axial compression were analyzed.(4)Using the finite element model,the variation law of the axial compression bearing capacity of the L-shaped wall of stainless steel core plate with the aspect ratio of the wall,the thickness of the panel,the outer diameter of the core tubes,the wall thickness of the core tubes,the lateral spacing of the core tubes arrangement and the longitudinal spacing are analyzed.(5)The eigenvalue buckling analysis of stainless steel core L-shaped wall was carried out by using finite element model validated by the experiment results.The explicit formulas for calculating the elastic local buckling load of stainless steel core L-shaped wall and the corresponding normalized aspect ratio?_n were obtained.Then nonlinear finite element analysis(NFEA)was carried out,the coefficient?,as well as the?-?_n curve for estimating axial compression strength of stainless steel core L-shaped wall considering its local buckling are obtained.It is found that the experimental results,the finite element results and the design formula of stainless steel core L-shaped wall are in good agreement,verifying the safety and effectiveness of the strength design formula of the stainless steel core L-shaped wall.