开孔冷弯薄壁卷边槽钢柱弹性局部屈曲分析*
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（1 安徽理工大学土木建筑学院， 淮南 232001； 2 兴安职业技术学院， 乌兰浩特 137400)
［摘要］已有研究成果表明，开孔冷弯薄壁卷边槽钢柱在压力作用下会发生一种特殊的局部屈曲——孔洞附近的未加劲条屈曲，而未加劲条弹性屈曲应力计算方法的确定是将直接强度法承载力公式用于开孔冷弯薄壁卷边槽钢柱设计时亟待解决的关键问题。基于以往开孔板件未加劲条屈曲的研究成果，对开孔冷弯薄壁卷边槽钢柱提出了考虑板件相关作用的未加劲条屈曲应力计算公式，并将此公式的计算结果与有限元特征值屈曲分析值进行了对比研究。结果表明，两者吻合较好，此公式可以应用于开孔冷弯薄壁卷边槽钢柱弹性局部屈曲应力的计算。［关键词］冷弯薄壁型钢; 局部屈曲; 未加劲条屈曲; 有限元分析; 有限条方法; 孔洞中图分类号：TU392.1 文献标识码：A 文章编号：1002-848X(2015)17-0059-04
Elastic local buckling analysis of coldformed thinwalled steel lipped channel column with holesYao Yonghong1, Wang Fengwei2
(1 School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; 2 Xing′an Vocational and Technical College, Ulanhot 137400, China)Abstract: The existing research results show that the unstiffened strip buckling, which is a kind of special local buckling, occurs near the holes in cold-formed thin-walled steel lipped channel column under compressive forces. The calculation method of the elastic unstiffened strip buckling stress is the key issues in direct strength method used for bearing capacity design formula for cold-formed thin-walled steel lipped channel column with holes. Based on the research of unstiffened strip buckling of plate with holes, the stress calculation formula for unstiffened strip buckling considering the correlation interaction of plates was proposed for cold-formed thin-walled steel lipped channel column with holes. The values acquired by proposed method were compared with the results by finite element eigenvalue buckling analysis. It is shown that two results are in good agreement and the proposed method can be used for the calculation of elastic local buckling stress of cold-formed thin-walled steel lipped channel column with holes.Keywords: cold-formed thin-walled steel; local buckling; unstiffened strip buckling; finite element analysis; finite strip method; hole
*住房与城乡建设部科学技术项目（2014-K2-033），安徽省博士后基金（DG152），安徽省住房与城乡科学技术项目（2013YF-11），安徽理工大学青年基金（12684）。作者简介：姚永红，博士，讲师，Email: yhyao@aust.edu.cn。
