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单轴对称开口薄壁压弯构件在荷载作用于对称平面内时有可能发生弯扭屈曲。在这种情况下,其临界荷载总是低于平面内弯曲失稳破坏荷载,如果在构件的开口边加上缀板,使之形成若干断续的封闭截面,则弯扭屈曲临界荷载将显著提高,并有可能使破坏模式由弯扭屈曲转化为平面内弯曲失稳。本文提出了一种计算薄壁压弯构件弯扭屈曲荷载的方法,这种方法对局部封闭和开口截面都能适用。曾经做了213根具有不同长细比、偏心距、缀板间距(或无缀板)的冷弯薄壁型钢压杆试验,其结果与理论符合较好。
The uniaxially symmetrical thin-walled thin-walled members may be subjected to flexural-torsional buckling when the load acts on the plane of symmetry. In this case, the critical load is always lower than the in-plane bending instability failure load. If the open edge of the component is added with a spline so that it forms several intermittent closed sections, the critical bending-torsional buckling load will be significant. It is possible to improve and possibly change the failure mode from bending-torsional buckling to in-plane bending instability. In this paper, a method for calculating the flexural-torsional buckling load of thin-walled compression-bending members is presented. This method can be applied to partially closed and open cross-sections. There have been 213 cold-formed thin-walled steel rods with different slenderness ratios, eccentricities, and plate spacings (or no panels). The results are in good agreement with the theory.