Study On Bearing Capacity Of Stainless Steel Core T-shaped Wall Under Axial Compression

The stainless steel structure can overcome various shortcomings of concrete structure and steel structure,and has strong performance advantages in terms of strength,durability,corrosion resistance and economic recovery.The sandwich panel is a valuable lightweight material with high specific strength,high specific stiffness and good impact properties,but the sandwich material is more used for roof waterproofing,wall enclosure or building curtain wall.The core structure test and related research are also based on this purpose and are not used as a precedent for load-bearing structures.The stainless steel core plate is composed of a stainless steel and a sandwich panel,and is composed of a two-layer stainless steel panel arranged in a densely arranged core tube,and then welded into a whole by copper brazing.The stainless steel core T-wall is a T-section member consisting of a flange wall limb and a web wall limb.Each wall limb consists of two stainless steel panels and orthogonally arranged stainless steel core tubes.The connection between the core tube and the panel is brazed.In this paper,the force mechanism of the T-shaped wall of stainless steel core plate under axial compression is studied,and the design formula of the bearing capacity of the axial compression section is established.The work is as follows:(1)In view of the T-shaped wall with stainless steel core,this paper summarizes the relevant research on stainless steel materials at home and abroad and its application status in architecture.The research history of honeycomb sandwich panel,shear wall axial compression performance and different shaped columns is summarized.(2)The axial compression test of three sets of stainless steel core T-wall full-scale test pieces was designed and carried out.The compressive bearing capacity of the section was tested.The damage process of the stainless steel core T-shaped wall was studied and recorded.Load-displacement curves,strain curves of sections,and failure mechanisms were studied for load,displacement,and strain data.(3)For the three experimental members,the ABAQUS finite element model was established and the eigenvalue buckling analysis of the stainless steel core T-wall was carried out.The influence of the built-in core tube on the local buckling performance of the outer panel was investigated.The axial compression process and failure mechanism are analyzed,and the reliability of the finite element model is analyzed and verified.(4)Based on the finite element model,the design parameters of the stainless steel core T-wall wall height ratio,panel thickness,core tube wall thickness,core tube diameter and core tube spacing are analyzed.The influence of the bearing capacity of the axial section of the T-shaped wall of the stainless steel core plate with various parameters was obtained.(5)Based on the results of parameter analysis,the calculation formulas of the elastic local buckling load of the T-shaped wall of stainless steel core plate and the corresponding regularized aspect ratio?_n are obtained.By the finite element nonlinear analysis,the local buckling effect of the panel is also considered.The?-?_n curve calculated from the compression stability coefficient?and the T-section bearing capacity.The test results,finite element analysis results and design formulas are in good agreement,and the safety and effectiveness of the design formula for the axial bearing capacity of the core section wall are verified.