带缀板开口冷弯薄壁型钢轴心受压构件稳定性研究

Study of Stability under Axial Pressure of Opened Cold-formed Thin-wall Steel with Batten Plates

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。

Batten plates putting on the open side of an opened cold-formed thin-wall steel member, can effectively a void the buckling deformation of the opened section, so as to improve the bearing capacity of the member. The number of the batten plates has a close relationship to the member＇s slenderness ratio. It can be found from theoretical derivation and digital computation of different members with different slenderness ratios that, when the slenderness ratio X is below 60, and batten plates are as much as 3 pieces, the increase of the bearing capacity is tending towards stability. While when the slenderness ratio;t is higher than 60, 5 or 6 batten plates are needed. At the same time, to make engineering de sign easy, bearing capacity calculation formula under bending buckling can be used in place of the formula of flexural-tor sional buckling, and the numerical relationship between the two formulas is list.