（长安大学建筑工程学院， 西安 710064）

［摘要］对轴心受压作用下热轧方矩钢管短柱的局部稳定受力性能和设计方法进行研究。采用ABAQUS建立有限元分析模型，考虑了构件不同初始缺陷以及残余应力分布的影响，并用收集到的试验数据验证有限元模型的可靠性。在此基础上，对不同高宽比，腹板高厚比以及正则化宽厚比的截面进行参数分析。结果表明，对于较薄柔的截面，板件相关作用对构件的轴压极限承载力的影响很大，设计公式应当予以考虑。将参数分析结果与欧洲、美国、中国钢结构设计规范以及直接强度法中方矩管截面局部稳定设计曲线进行对比，并提出了考虑板件相关作用的修正直接强度设计方法。结果表明修正后的直接强度法设计公式与有限元计算结果吻合很好，计算结果更为合理。

［关键词］局部稳定； 热轧方矩钢管截面； 轴心受压构件； 板件相关作用； 直接强度法

中图分类号：TU391文献标识码：A文章编号：1002-848X(2019)16-0085-06

Research on local stability behavior of axially compressed stub columns with hot-rolled steel square and rectangular hollow sections considering the plate interaction

Li Liya，  Lin Chenhao，  Yuan Weining

(College of Civil Engineering, Chang′an University, Xi′an 710064, China)

Abstract:An investigation into the local stability behavior and the design method of hot-rolled steel square and rectangular hollow sections (SHS/RHS) stub columns under axial compression was presented. The finite element models considering both different local imperfections and residual stresses patterns were established using ABAQUS and the reliability of the finite element models was verified by collected test data. Based on that, parameter analysis on different cross-section aspect ratio, web height to thickness ratio and regularization width to thickness ratio were performed. The results show that for slender cross-sections, the element interaction influences the ultimate capacity of members under axial compression significantly, which should be considered in the design formula. The results of parameter analysis were compared with the local stability design curves of SHS/RHS in the European, American and Chinese steel structure design codes and the direct strength method, and a modified direct strength method considering the element interaction was proposed. The results show that the modified direct strength method design formula agrees well with the finite element calculation results, and the calculation results appear more reasonable.

Keywords:local stability; hot-rolled steel SHS/RHS; axial compression member; plate interaction; direct strength method

作者简介：李利亚，博士研究生，Email: liya_chd@sina.com。