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考虑了单元间相互作用,提出热轧钢结构局部弹性屈曲应力的解析式,将局部屈曲分析结果与美国AISC钢结构规范中确定局部允许长细比时的内在假定进行对比。采用有线条法确定横截面局部屈曲应力。分析了AISC构件数据库中(不含管)每个截面在轴压下及绕主、次轴正、负弯曲时的局部稳定性。将求局部屈曲应力转化为计算平面屈曲系数k,给出了k的简化公式。新公式明确考虑了构件腹板-翼缘的弹性相互作用。结果表明:有线条法计算的k值与AISC规范中的假定明显不同。
Considering the inter-element interaction, an analytical expression of the local elastic buckling stress of hot-rolled steel structure is proposed. The local buckling analysis results are compared with the internal assumptions when determining the local allowable slenderness ratio of AISC steel structure code. Determine the local buckling stress of cross section using the method of line. The local stability of each section of AISC component database (without tube) under axial compression and around primary and secondary positive and negative bends was analyzed. The local buckling stress is transformed into the calculation of plane buckling coefficient k, and the simplified formula of k is given. The new formula explicitly considers the web-flange elastic interaction. The results show that the k value calculated by the line method is obviously different from the assumption in the AISC code.