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首页> 外文期刊>Thin-Walled Structures >Numerical investigation on the influence of imperfections in the lateral-torsional buckling of beams with slender I-shaped welded sections
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Numerical investigation on the influence of imperfections in the lateral-torsional buckling of beams with slender I-shaped welded sections

机译：缺陷对细长I形焊接截面梁的横向扭转屈曲影响的数值研究

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摘要

In this paper, a numerical investigation is carried out for determining the influence of imperfections on the lateral-torsional buckling of welded I-shaped slender section beams. The buckling resistance of unrestrained beams is calculated with nonlinear shell-element based FE analysis, including material and geometrical imperfections. The sensitivity to global and plate imperfections, as well as residual stresses, is presented for different amplitudes and shapes of geometrical imperfections and distributions of residual stresses available in the literature.The recommendations outlined in this work shall help the choice of these parameters on future numerical simulations and extend the observations of other authors in the context of studies for beams with non-slender sections.The comparison of the numerical results with the predictions of the North American design code, AISC360-16, and the European design code, Eurocode 3, suggests that the AISC360-16 provides an upper limit for the beam's resistance and the Eurocode 3 a lower bound, mainly because residual stresses have a greater impact in the load-carrying capacity on the studied beams. Thus, these findings are expected to promote future developments and amendments to said design codes.Finally, this investigation also supports the need of more realistic definition of imperfections, especially for the case of residual stresses, and justifies a more comprehensive experimental campaign on the subject.
机译：本文进行了数值研究，以确定缺陷对焊接的I形细长截面梁的横向扭转屈曲的影响。通过基于非线性壳单元的有限元分析来计算无约束梁的屈曲阻力，包括材料和几何缺陷。给出了针对不同的几何缺陷的幅度和形状以及残余应力分布的对整体缺陷和板缺陷以及残余应力的敏感性，这项工作中概述的建议将有助于在将来的数值计算中选择这些参数模拟和扩展了其他作者在研究非细长截面梁时的观察结果。将数值结果与北美设计规范AISC360-16和欧洲设计规范Eurocode 3的预测进行了比较，这表明AISC360-16为梁的阻力提供了上限，而Eurocode 3为梁提供了下限，这主要是因为残余应力对所研究梁的承载能力有较大的影响。因此，这些发现有望促进上述设计规范的未来发展和修正。最后，该研究还支持对缺陷的更现实定义的需求，特别是对于残余应力的情况，并证明对此主题进行了更全面的实验。

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