薄壁异形截面铝合金轴心受压柱屈曲模态耦合及承载力计算  

Ultimate Strength and Failure Mode Interaction of Thin-Walled Aluminum Alloy Columns with Irregular Cross Section under Axial Compression

作　　者：刘梅[1] 常熤存 刘昌斌[1] 郭康瑞 

机构地区：[1]山东大学土建与水利学院,济南250061

出　　处：《建筑钢结构进展》2016年第3期24-34,共11页Progress in Steel Building Structures

基　　金：山东大学自主创新基金(2014HW013);中国博士后科学基金(2015M572036);教育部留学回国人员科研启动基金

摘　　要：薄壁异形截面铝合金构件广泛应用于建筑结构中,但其截面的复杂性导致该类构件的破坏模态更加复杂。有限元模型采用有限元软件ABAQUS建立并经过试验结果验证。通过有限元方法,分析了薄壁异形截面铝合金柱的塑性屈服、局部屈曲与塑性屈服耦合、局部屈曲与整体屈曲耦合、以及整体屈曲等4种破坏模式的构件变形和截面应力发展。将有限元方法计算的薄壁异形截面铝合金轴压柱极限承载力,与国内外铝合金结构设计规范的计算结果进行了对比。结果表明,现行规范的设计方法在计算薄壁异形截面铝合金轴压柱的承载力时都较为保守。Thin-walled aluminum alloy column with irregular cross section is widely used in building structure.However,the complexity of its cross section usually leads to various failure modes.A finite element model is developed using ABAQUS,and the validity of model is established by comparing ultimate strength,failure modes and deformation obtained from experimental studies.Failure mode interactions of thin-walled columns with irregular cross section under axial compression are also investigated through finite element model（FEM）.The failure modes include sectional yielding,combination of local buckling and sectional yielding,combination of local and global buckling,and global buckling.Member deformation along the column and cross sectional stress development in different failure modes are presented.The ultimate strength of an aluminum alloy column with different slenderness ratio obtained from finite element analysis（FEA）is compared with those calculated using current structural design codes.The results show that current codes underestimate the ultimate strength of thin-walled columns with irregular cross section.

关 键 词：铝合金柱 异形截面 屈曲模态耦合 承载力 

分 类 号：TU395[建筑科学—结构工程]