高强铝合金箱形偏压柱稳定性能研究  

Flexural buckling performance of high-strength aluminium alloy box-shaped columns under eccentric compression

作　　者：李贝贝 沈锋[1] 王静峰 王元清[4] 莫帅[5] 欧阳元文 LI Beibei;SHEN Feng;WANG Jingfeng;WANG Yuanqing;MO Shuai;OUYANG Yuanwen(College of Civil Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Key Laboratory of Civil Engineering Structures and Materials,Hefei University of Technology,Hefei 230009,China;Anhui Advanced Steel Structure Technology and Industrialization Collaborative Innovation Center,Hefei University of Technology,Hefei 230009,China;Key Laboratory of Civil Engineering Safety and Durability of China Ministry of Education,Tsinghua University,Beijing 100084,China;State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,Guangxi University,Nanning 530004,China;Shanghai Tongzheng Aluminum Engineering Technology Co.,Ltd,Shanghai 201100,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]合肥工业大学土木工程结构与材料安徽省重点实验室,安徽合肥230009 [3]合肥工业大学安徽省先进钢结构技术与产业化协同创新中心,安徽合肥230009 [4]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [5]广西大学省部共建特色金属材料与组合结构全寿命安全国家重点实验室,广西南宁530004 [6]上海通正铝结构建设科技有限公司,上海201100

出　　处：《建筑结构学报》2025年第2期201-210,共10页Journal of Building Structures

基　　金：国家自然科学基金(52108154);安徽省科技创新平台重大科技项目(202305a12020013);广西科技重大专项(AA23073019);中央高校基本科研业务费专项资金资助(JZ2023HGTB0258)。

摘　　要：为了研究7A04-T6高强铝合金偏心受压构件的稳定性能,进行了8根箱形截面柱偏压静力试验研究。分析了材料力学性能、偏压柱破坏模式和稳定承载力;基于验证的有限元分析模型,对不同偏心率、截面宽高比、板件宽厚比和构件长细比的高强铝合金箱形偏压柱进行了参数分析。结果表明:7A04-T6高强铝合金材料的平均名义屈服强度为536 MPa,明显高于6XXX系列普通强度铝合金的;轴力-弯矩相关曲线随构件长细比的增大从倾斜直线发展为半椭圆形再到平行直线;采用我国GB 50429—2007《铝合金结构设计规范》中相关公式对7A04-T6高强铝合金箱形偏压构件稳定承载力的预测最为保守,承载力低估达28%,美国AA-2020和连续强度法的预测结果中有近50%的数据点偏于不安全;欧洲EN 1999-1-1对于绕强轴失稳的箱形偏压构件稳定承载力的预测精度较高,而对于绕弱轴失稳的箱形偏压构件稳定承载力的预测结果的离散性最高。基于我国GB 50429—2007修正的计算公式可以显著提高7A04-T6高强铝合金箱形偏压柱稳定承载力的预测精度,计算结果的离散性明显降低。To study the stability performance of 7A04-T6 high-strength aluminum alloy columns under eccentric compression,the static tests of eight box-shaped columns were conducted.The mechanical properties,failure modes and buckling resistances of the specimens were analyzed.Based on the verified finite element analysis model,a broad range of parameters of high-strength aluminium alloy box-shaped beam-columns such as eccentricity,section aspect ratio,plate width to thickness ratio and member slenderness ratio were investigated.The results show that the nominal yield strength of 7A04-T6 high-strength aluminum alloy is 536 MPa,which is obviously higher than that of 6XXX series normal-strength aluminum alloy.With the increase of slenderness ratio,the axial force-bending moment correlation curve changes from oblique straight line to semi-ellipse and then to parallel straight line.Using GB 50429—2007,the predicted resistances of 7A04-T6 high-strength aluminum alloy box-shaped beam-columns is underestimated by 28%,while using American AA-2020 and continuous strength method,nearly 50%of the prediction results lie in the unsafe side.The prediction accuracy of EN 1999-1-1 for the buckling against the strong axis is relatively better than that of the other three design methods,while the scatting of its prediction results for the buckling against the weak axis is the most obvious.The accuracy and consistency of the predicted buckling resistances of 7A04-T6 high-strength aluminum alloy box-shaped beam-columns can be significantly improved by the proposed correction formula based on GB 50429—2007.

关 键 词：高强铝合金 箱形截面柱 偏心受压 静力试验 有限元分析 稳定承载力 

分 类 号：TU395[建筑科学—结构工程]