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在开口冷弯薄壁型钢构件沿开口方向上布置一定数量的缀板,能有效阻止开口截面的翘曲变形,可以有效地提高构件承载力。合适的缀板数量与构件长细比有着密切的关系,通过理论推导及对不同长细比构件的数值计算发现,当构件长细比λ小于60,而缀板数量达到3块时,构件承载能力提高幅度趋于稳定;当λ大于60时,缀板数量则需要达到5～6块。同时,为了方便工程设计使用,提出利用熟知的弯曲失稳计算公式的形式,来计算弯扭失稳构件的计算方法,并列表显示出两者之间的数值关系。
The cold-formed thin-walled section steel members are arranged in a certain number along the opening direction so as to effectively prevent the warping deformation of the open section and effectively increase the bearing capacity of the component. The number of suitable slab is closely related to the slenderness ratio of the member. By theoretical deduction and numerical calculation of different slenderness ratio members, it is found that when the slenderness ratio λ is less than 60 and the number of slab reaches 3, Capacity increases tend to stabilize; when λ is greater than 60, the number of slats is required to reach 5 to 6 blocks. At the same time, in order to facilitate the engineering design and use, the calculation method of the buckling-instability member is proposed by using the well-known form of bending instability formula, and the numerical relationship between the two is shown.