Study on axial compression behavior of 6A13-T6 high-strength aluminum alloy square section columns
To investigate the force performance of 6A13-T6 aluminum alloy square cross-section axial compression members and to promote engineering applications,the material performance test,axial compression performance test of extruded square cross-section members,and finite element analysis were carried out with aluminum alloy members for curtain walls as the object of research,and the mechanical properties of the materials,the failure modes of the members and the methods of calculating the bearing capacity were investigated,as well as the evaluation and reliability analysis of the results of bearing capacity prediction obtained from the Chinese,American and Australian specifications and the direct strength method.The predicted results of Chinese,American,and Australian specifications and the predicted results of the direct strength method were evaluated and analyzed for reliability.The results show that the non-proportional yield strength f0.2 of 6A13-T6 aluminum alloy is as high as 340 MPa,and the elongation after fracture is 14.5％;the large width-to-thickness ratio of the plates makes the members show obvious local buckling phenomenon at failure;as the length of the members increases,the failure mode of the members is changed from local buckling to coupled local-integral buckling,and the bearing capacity decreases significantly.The stiffening effect of the shaped part of the section can be conservatively disregarded in the bearing capacity calculation of the members.In general,the bearing capacity assessment using the relevant specifications is conservative,and the direct strength method has the best prediction effect,which is recommended to be used for the bearing capacity assessment.In addition,the reliability of each of the above bearing capacity prediction methods is greater than 2.5 but only meets the relevant requirements of the American and Australian specifications.To meet the requirement of the target reliability of 3.7 in the Chinese specification,the resistance sub-coefficient can be revised to 1.40.
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