拉弯构件的弯扭失稳计算

根据拉弯与压弯构件弯扭失稳的相似性 ,推导出弯扭失稳时拉力与弯矩的理论相关公式 ,并采用有限元法对公式进行了验证 ;参考现行钢结构设计规范提出了设计用的拉力弯矩相关公式 ,与欧洲规范EC3的公式进行了比较。结果表明 ,在弹性阶段 ,双轴对称截面的计算公式更加接近有限元计算结果 ,而对于单轴对称截面和T形截面 ,EC3的公式有时偏于不安全。

FLEXURAL-TORSIONAL BUCKLING OF MEMBERS IN FLEXURE AND TENSION

An analytical and numeric al analysis on flexural-torsional buckling of members in combined ben ding and axial tension is carried out.The interaction relations of a xial force and bending moment are established for members with diffe rent uniaxial-symmetrical cross-sec tion,and confirmed by finite eleme nt analysis.At last,interaction eq uation of axial load and bending l oad is proposed for practical desi gn.A comparison is made between the proposed formulae and those of Eur ocode 3.