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Buckling improvement of pretwisted universal steel beams
Thin-Walled Structures ( IF 6.4 ) Pub Date : 2020-09-19 , DOI: 10.1016/j.tws.2020.107117
Farid Abed , Fadia Ajjan , Chahmi Oucif

Beams are structural components that are mainly utilized to resist flexure. However, beam sections are also commonly used to resist axial tension and compression in certain situations such as when they are used as truss members or braces. Pretwisting compression members strengthens their weak flexural plane and weakens their strong flexural plane, leading to an overall improvement in the buckling capacity. In this paper, pretwisting is applied to structural steel UB100 × 50 × 9.3 beam sections, both experimentally and numerically using finite element (FE) analysis, in an attempt to improve their critical buckling capacity. The experimental study consists of fourteen specimens of three different lengths and a variety of pretwist angles, while the linear-perturbation FE analysis considers ninety-one specimens of eight length groups and a pretwist angle range between 0° and 180°. In both studies, it was found that pretwisting improves the critical buckling capacity of UB100 × 50 × 9.3 beams. The linear-perturbation analysis also showed that the length of the members has no effect on the buckling capacity improvement, and that this improvement is highly significant under fixed-fixed end conditions but not under pinned-pinned conditions.



中文翻译:

预扭万能钢梁的屈曲改进

梁是主要用于抵抗弯曲的结构部件。但是,在某些情况下(例如当它们用作桁架构件或支撑时),梁截面也通常用于抵抗轴向拉伸和压缩。预扭转的受压构件会增强其弱的挠性平面并削弱其强的挠性平面,从而导致整体屈曲能力提高。在本文中,通过有限元(FE)分析在数值和数值上对结构钢UB100×50×9.3梁截面进行了预扭,以提高其临界屈曲能力。实验研究由14个标本组成,这些标本具有3种不同的长度和各种预扭转角,而线性摄动有限元分析考虑了九个标本,分为八个长度组,且预扭转角范围在0°至180°之间。在两项研究中,都发现预扭曲可提高UB100×50×9.3梁的临界屈曲能力。线性摄动分析还表明,构件的长度对屈曲能力的提高没有影响,并且这种改进在固定端部固定条件下非常显着,而在销钉固定条件下则没有。

更新日期:2020-09-20
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