6A13-T6高强铝合金方形截面柱轴压性能研究  

Study on axial compression behavior of 6A13-T6 high-strength aluminum alloy square section columns

作　　者：钟昌均 冯若强[1] 李虎阳 ZHONG Changjun;FENG Ruoqiang;LI Huyang(Key Laboratory of Concrete and Prestressed Concrete Structures of China Ministry of Education,Southeast University,Nanjing 211189,China;School of Engineering,University of Western Australia,WA Perth 6009,Australia)

机构地区：[1]东南大学混凝土与预应力混凝土结构教育部重点实验室,江苏南京211189 [2]西澳大学工程学院,西澳洲珀斯6009

出　　处：《建筑结构学报》2024年第12期213-222,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51778283,51978151)。

摘　　要：为研究6A13-T6铝合金方形截面轴心受压构件的受力性能,以幕墙用铝合金构件为研究对象,开展了材料性能试验、挤压方形截面构件轴压性能试验和有限元分析,研究了材料的力学性能、构件的失效模式和承载力计算方法,并对中国、美国、澳洲规范和直接强度法得到的承载力预测结果进行了评估和可靠度分析。结果表明:6A13-T6铝合金的非比例屈服强度f0.2高达340 MPa,断后延伸率为14.5%;板件较大的宽厚比使得构件在失效时均出现了明显的局部屈曲现象;随着构件长度增大,构件失效模式由局部屈曲转为局部与整体耦合屈曲,且承载力大幅下降。验算构件承载力时,可偏保守地不考虑截面异形部分的加劲作用。总体上,采用相关规范进行承载力评估均偏保守,直接强度法的预测效果最好,建议采用该方法进行承载力评估。此外,上述各承载力预测方法的可靠度均大于2.5,但仅满足美国及澳洲规范的相关要求。为满足中国规范中目标可靠度3.7的要求,建议将抗力分项系数修正为1.40。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 340MPa,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.

关 键 词：铝合金轴压构件 6A13-T6高强铝合金 屈曲性能 轴压试验 有限元分析 设计方法评估 

分 类 号：TU395[建筑科学—结构工程]