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首页> 外文期刊>International journal of steel structures >Experimental and Numerical Investigation on Stiffened Rectangular Hollow Flange Beam
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Experimental and Numerical Investigation on Stiffened Rectangular Hollow Flange Beam

机译：加强矩形空心法兰梁的实验和数值研究

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摘要

Cold-formed thin-walled steel hollow flange beam (HFB) has been emerged and utilised structurally. It is composed of one or two closed flanges with high torsional stiffness and relatively flexible web. Hence, the global stability of such beam has greatly been improved compared with conventional I-beams with flat flanges, due to their superior torsional stiffness and stability. However, under concentrated loading, local flange deformation occurs easily at the load-action-region, because the tubular flange is hollow even if stiffeners are attached to the webs. Up-to-date, rather than filling the tubular flange with concrete, there is not any relevant literature or reports on how to improve the local buckling state of the hollow flange I-beams. Accordingly, in this paper, a stiffened compression rectangular hollow flange beam (SCHFB) is presented, from which the web penetrates the bottom wall of the top tubular flange until it reaches its top wall. By doing so, several concentrated loads may be applied safely on the beams or the segmental lunching technique may successfully be used to erect the beam in its place. This paper examines experimentally this stiffened beam and then extends to use the finite element modelling to replicate the actual behaviour of the beam. A numerical comparison between the SCHFB, conventional CHFB and I-beam shows that the ultimate bearing capacity and ductility are significantly enhanced in the case of SCHFB compared with the other two beams. Additionally, the SCHFB has been found to own better local deformation performance than that of the CHFB. However, with the span increase, the vertical concave deformation, lateral deformations at top flange and vertical deformations of top flange plate of the tubes of the SCHFB and CHFB may approach each other. So, the SCHFB becomes the best choice for short-span beams under either concentrated or distributed loading.
机译：在结构上出现并使用冷成型薄壁钢中空法兰梁（HFB）。它由具有高扭转刚度和相对柔性的网的一个或两个封闭法兰组成。因此，与具有扁平凸缘的传统I梁相比，这种梁的全球稳定性大大提高，由于它们的倾斜刚度和稳定性具有扁平法兰。然而，在浓缩负载下，局部法兰变形在负载 - 动作区域容易发生，因为即使加强件连接到腹板上，管状凸缘也是空心的。最新，而不是用混凝土填充管状法兰，没有任何相关的文献或关于如何改善空心法兰I光束的局部屈曲状态的报告。因此，在本文中，提出了一种加强的压缩矩形中空法兰梁（SCHFB），幅材从该卷材穿过顶部管状凸缘的底壁，直到它到达其顶壁。通过这样做，可以在光束上安全地施加几个集中载荷，或者可以成功地使用分段午餐技术来在其位置竖立光束。本文审查了实验这一加强光束，然后延伸以使用有限元模拟来复制光束的实际行为。 SCHFB，常规CHFB和I梁之间的数值比较表明，与其他两个光束相比，SCHFB的情况下，极限承载能力和延展性显着提高。此外，已经发现SCHFB拥有比CHFB更好的局部变形性能。然而，随着跨度的增加，垂直凹陷变形，顶部凸缘处的横向变形和SCHFB的管的顶部凸缘板的垂直变形可以彼此接近。因此，SCHFB成为在集中或分布式负载下的短跨度梁的最佳选择。

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