轴心受压不等边角铝构件整体稳定试验研究  

Experimental Investigation on Overall Stability of Aluminium Alloy Unequal-Leg Angle Section Columns

作　　者：张颖 王元清[1] 卜宜都 王中兴[1] 范圣刚[2] 谢军 Zhang Ying;Wang Yuanqing;Bu Yidu;Wang Zhongxing;Fan Shenggang;Xie Jun(Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education of China,Tsinghua University,Beijing 100084,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;Jiangsu Kedi Construction Engineering Quality Inspection Co.,Ltd.,Nanjing 211189,China)

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]东南大学土木工程学院,南京211189 [3]江苏科迪建设工程质量检测有限公司,南京211189

出　　处：《天津大学学报（自然科学与工程技术版）》2020年第12期1236-1242,共7页Journal of Tianjin University：Science and Technology

基　　金：高等学校博士学科点专项科研基金(优先发展领域)资助项目(20110002130002).

摘　　要：铝合金具有质量轻、耐腐蚀等优点,在建筑结构中有着广泛的应用,不等边角形铝合金可以应用在塔架和桁架结构当中.由于铝合金材料弹性模型小,铝合金结构在使用过程中变形更加明显,构件的稳定问题尤其突出.为研究轴心受压不等边角形铝合金构件的非线性屈曲特征和稳定承载力,开展了轴心受压不等边角形铝合金试件的静力加载试验.14个不等边角形6061-T4挤压型铝合金试件包含两种截面尺寸,试验过程包括材性试验、初始缺陷测量和轴心受压不等边角铝构件的稳定试验,对试件屈曲模态、极限承载力和和荷载位移曲线进行了观察和测量.将试验结果与欧洲铝合金结构设计规范的设计计算结果进行对比,结果表明:对于不同长细比的轴心受压不等边角铝试件,弯曲屈曲模态和扭转屈曲模态的相互关系影响试件的极限承载力,长细比越大,扭转屈曲模态占比越低,弯曲屈曲模态占比越高.我国的铝合金结构设计标准在修订过程中应充分考虑弯扭屈曲模态的影响.Aluminium alloy has been widely used in the construction industry due to its high strength-to-weight ratio,good corrosion resistance,and visual effect.Aluminium alloy columns with unequal-leg angle sections can be used in transmission towers,bridges and truss structures.Owing to the nonlinearity,strain hardening behaviour,and limited ductility of the material,the stability problem of aluminium alloy columns is prominent,and the structural behaviour of aluminium alloy unequal-leg angle section columns may differ significantly from that of their steel counterparts.Fourteen aluminium alloy extruded unequal-leg angle section columns,including two cross sections were tested to investigate their overall stability under axial compression.Prior to the test,geometric imperfection measurements and material tests were conducted.In the test,the failure modes,stability resistance,as well as loaddeformation responses were identified.The ultimate resistance values derived from the tests were adopted to evaluate the applicability of the current codified standards.The interaction between flexural and torsional buckling modes are different for different column slenderness,which affect the load-carrying capacities for larger slenderness ratio,the flexural buckling mode proportion is larger compared with the torsional buckling mode.The development of applicable design proposals and further investigation into buckling modal participation for pin-ended extruded aluminum alloy unequal-leg angle section columns are required.

关 键 词：不等边角铝 轴心受压 稳定试验 屈曲模态 设计方法 

分 类 号：TU391[建筑科学—结构工程]