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屈曲前变形形成的反向拱的作用很大,使钢梁的弹性屈曲临界弯矩将有很大的提高,这种有利影响可以通过临界弯矩修正系数来反映。通过大量的计算,得到各种截面规格的不同钢材种类、不同类型梁计算长度由刚度条件决定的情况下常用I和H型钢梁屈曲前变形对弯扭屈曲影响的临界弯矩修正系数,得到如下有用的结论:可以忽略计算长度、钢材种类和梁的类型对临界弯矩修正系数的影响;可以忽略I、HN型钢梁屈曲前变形对临界弯矩的有利影响,适当考虑HM型钢梁屈曲前变形对临界弯矩的有利影响,应该考虑HW型钢梁屈曲前变形对临界弯矩的有利影响。以型钢梁作为研究对象获得的结论,适用于具有类似截面特性的焊接组合钢梁。
The effect of the inverted arch formed by the pre-buckling deformation is great, so that the critical bending moment of the elastic buckling of the steel beam will be greatly improved. This favorable effect can be reflected by the critical bending moment correction coefficient. Through a large number of calculations, the critical moment correction factors of the flexural-torsional buckling of flexural-torsion buckling of prestressed I and H-beams are obtained by different types of steels with different section sizes and different lengths and lengths of beams under different stiffness conditions. The following useful conclusions can be ignored: the influence of calculation length, type of steel and type of beam on the critical moment correction factor can be ignored; the favorable influence of pre-buckling deformation of I and HN beam on critical moment can be neglected, The favorable influence of pre-buckling deformation on critical moment should consider the favorable influence of pre-buckling deformation of HW-beam on critical moment. The conclusion obtained with the steel beam as a research object is applicable to welded composite steel beams with similar cross-section characteristics.