Numerical Modelling And Design Of Aluminum Alloy SHS And RHS Columns And Beam-columns

Aluminum alloy structures are increaingly used in building structures,in recent decades.Among various cross-section forms square hollow section（SHS）and rectangular hollow section（RHS）are commonly used as structural components.The Continuous Strength Method（CSM）is a deformation design method based that can effectively utilize the strain hardening properties,CSM was originally a method developed for the cross-section design of stainless steel components.In recent years,CSM has also been applied to the design of aluminum alloy structural components.The finite element analysis（FEA）software ABAQUS was used to study the bearing capacity performance of axial compression and beam-column members with SHS and RHS of aluminum alloy,and CSM was extended to the design formula of ultimate resistance of beam-column members with SHS and RHS of aluminum alloy in this paper.The main research contents are as follows:（1）The tests on axial compression and beam-column members with SHS and RHS of aluminum alloy done by the predecessors were collected,the FEA software ABAQUS was used to verify.The FEA models were established to simulate the axial compression and beam-column members with SHS and RHS of aluminum alloy,the FEA results were compared with the test results,and the accuracy of the FEA models was verified.（2）By using the verified FEA models,the finite element parametric analyses of the bearing capacity performance of axial compression members with SHS and RHS of aluminum alloy were carried out.Based on the test results and the finite element parametric analysis results of the axial compression members,the applicability of the ultimate resistance calculation formulas for axial compression members with SHS and RHS in the design codes of aluminum alloy structures in Europe,North America and China was verified.In addition,the modified overall stability coefficientφ_mod formula was put forward,and the more accurate Modified EC9 formula for calculating the ultimate resistance of aluminum alloy axial compression members with SHS and RHS was proposed.（3）By using the verified FEA models,the finite element parametric analyses of the aluminum alloy SHS and RHS beam-column members were carried out,and the influences of the yield strength,regularized slenderness ratio,width-thickness ratio on the bearing capacity of beam-column members with SHS and RHS of aluminum alloy were analyzed.（4）By using the verified FEA models,the finite element parametric analyses of the bearing capacity performance of aluminum alloy SHS and RHS beam-column members were carried out.Based on the test results and the finite element parametric analysis results of the beam-column members,the applicability of the ultimate resistance calculation formulas for beam-column members with SHS and RHS in the design codes of aluminum alloy structures in Europe,America and China was verified.Furthermore,the continuous strength method（CSM）was extended to the ultimate resistance design formula of beam-column members with SHS and RHS of aluminum alloy.Combined with the Modified EC9 formula,the Modified EC9-CSM formula with improved accuracy was proposed.