Study On Stability Of H-Aluminum Alloy Members In Temcor Aluminum Alloy Space Reticulated Shell

As an emerging building structural material,aluminum alloy has many advantages compared with traditional steel,such as low density,lightweight,good corrosion resistance and extrusion molding.Compared with steel,the unit price of aluminum alloy is higher,but it has been widely used in large-span space structures in recent years due to low maintenance costs.The elastic modulus of aluminum alloy is 70,000 Mp,which is only 1/3 of that of ordinary steel.The overall stability and local stability in the stability problem are the main failure modes of the aluminum alloy structure.It is necessary to study the overall stability and local stability of the biasing member.At present,a lot of researches have been done on the overall stability and local stability of single-layer H-section aluminum alloy members at home and abroad,but there are few studies on the stability of double-layer H-section aluminum alloy members,so it is necessary to double-layer H The stability of the aluminum alloy component of the section is studied in depth in order to provide a basis for engineering practice.In this paper,the constitutive relationship model and finite element analysis model of aluminum alloy materials were determined by experimental research on H-section aluminum alloy members.The relevant formula of bearing capacity of aluminum alloy compression-bending members and the calculation formula of bending stiffness of alloy members with double-layer H-section considering bolt slip effect.The main research results of this paper are as follows:1)Firstly,the tensile test of six H-section aluminum alloy members with material grade 6061-T6 was carried out,and the stress-strain relationship curves of the test materials and their properties in the Ramberg-Osgood constitutive model were obtained.2)The two single-layer members and two double-layer members were tested for bending resistance,and the failure modes,ultimate loads and local post-buckling bearing capacities of the two members were analyzed.3)The axial compression test of two single-layer members and two double-layer members is carried out,and the failure modes,instability modes and ultimate bearing capacity of the two members under axial load are analyzed.4)The bias test of four single-layer members and four double-layer members was carried out respectively.The load eccentricity was the main parameter,and the out-of-plane stability bearing capacity of different members under bias load was obtained.The instability and deformation performance of different members was investigated.5)All components were modeled and analyzed using the finite element analysis software ABAQUS and compared with the test results.The factors affecting the stability bearing capacity of double-layer H-section aluminum alloy members were systematically analyzed and extensively parameterized.6)Through a large number of parametric analysis,the calculation formula of the bending stiffness of the two-layer member considering the bolt slip effect is obtained.The correction coefficient in the calculation formula of the stability bearing capacity of the two-layer member is introduced.