卷边槽钢压杆考虑板组约束作用的屈曲系数

卷边槽钢压杆的局部屈曲具有相关性。《冷弯薄壁型钢结构技术规范》(GB50018-2002)提出适用于各种不同截面的板组约束系数的统一计算公式来考虑这种相关性。但由于板组组成的多样性,其是否合理,有待于进一步研究。借助ANSYS有限元分析软件,对卷边槽钢压杆局部屈曲进行分析,得到考虑板组约束作用的屈曲系数,并和国内外规范进行比较。结果表明,计算结果和英国规范吻合较好,我国规范偏于安全较多。借鉴英国规范的形式,给出考虑板组约束作用的屈曲系数的计算公式,这些公式可供进一步修订规范时参考。

BUCKLING COEFFICIENTS TAKING INTO ACCOUNT CONSTRAINT ACTIONS BETWEEN PLATE ELEMENTS OF LIPPED CHANNEL STRUTS

For cold-formed lipped channel struts, there are correlations between buckling of plate elements. Uniform constraint coefficient formulas used for various sections with different plate elements are given in the current code GB 50018-2002. But because of diversity of plate elements, whether it is rational or not, further researches are required. An analysis of lipped channel struts is made by ANSYS, and buckling coefficients, taking constraint action between plate components into account, are obtained, and compared with the codes both at home and abroad. It is shown that the results coincide well with British code; the code of our country is excessively safe. Using the form of British code for relerence, formulas of buckling coefficients, taking constraint action into account, are given. These formulas provide reference for revision of specifications.