螺旋焊接钢柱切口周围的应力集中

IF 1.1 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Steel Structures Pub Date : 2024-07-24 DOI:10.1007/s13296-024-00876-x
Jayasri Muthukumaran, Jane Helena Henderson
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引用次数: 0

摘要

螺旋焊接 (SW) 柱已广泛应用于各种结构,包括管道建设、风力涡轮机塔、地基桩和高层建筑。虽然之前的研究已经对平板上的切口进行了研究,但对具有类似切口的圆柱的研究还存在明显不足。鉴于这些结构所起的关键作用,越来越有必要将研究重点放在理解具有切口的曲面板的应力集中行为上。具体来说,由于应力分布均匀,柱子中的圆形切口会导致应力集中减弱。本研究对具有不同长径比 (L/D) 的 SW 钢柱进行了全面研究,这些钢柱包含不同尺寸的圆形切口,并受到轴向压缩。对 18 个试样进行了实验,并根据 Abaqus 软件的分析结果对实验结果进行了仔细检查和比对。为了进行全面分析,创建了 990 个有限元 (FE) 模型,并进行了非线性分析。随后,对纵向焊接 (LW) 柱和 SW 柱进行了比较研究,并结合了不同的切口尺寸和位置。分析调查和实验测试的结果显示出明显的相关性。其中出现了一个耐人寻味且自相矛盾的现象:在减少结构质量的同时,增大 SW 柱内切口的尺寸会增加屈曲载荷。由于存在连续的螺旋焊缝,SW 柱沿其长度方向的应力分布更加均匀。这种螺旋焊缝使支柱能够有效地分散外加载荷,最大限度地减少局部应力集中。相比之下,LW 柱的焊缝平行于柱的长度,可能会在结构内部造成应力集中和脆弱区域。因此,与 LW 柱中的线性焊缝相比,SW 柱中螺旋焊缝的连续性增强了载荷分布,降低了应力集中引起薄弱环节的可能性。这一现象凸显了螺旋焊接技术带来的卓越承载能力,使 SW 柱成为强度和效率至关重要的应用领域的首选。此外,还利用实验测试和分析研究得出的数据,提出了 SW 柱切口周围应力集中系数的计算公式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Stress Concentration Around Cutouts in Spirally Welded Steel Columns

Spirally welded (SW) columns have found widespread application in diverse structures, including pipeline constructions, wind turbine towers, foundation piles, and high-rise buildings. While prior research has examined cutouts in flat plates, there is a noticeable gap in the investigation of circular columns with similar cutouts. Given the critical role these structures play, it is increasingly imperative to direct research endeavours toward comprehending the behaviour of stress concentration in curved plates featuring cutouts. Specifically, the presence of circular cutouts in a column is shown to induce a diminished stress concentration, owing to the even distribution of stresses. This research delves into a comprehensive study of SW steel columns of different length-to-diameter ratios (L/D) that incorporate circular cutouts of varying sizes and subjected to axial compression. Experiments were conducted on 18 specimens, with results scrutinized and benchmarked against analytical outcomes obtained through Abaqus software. For a comprehensive analysis, 990 finite element (FE) models were created, and non-linear analysis was carried out. Subsequently, a comparative examination was undertaken between longitudinally welded (LW) and SW columns, incorporating varying cutout sizes and positions. The results of both analytical investigations and experimental tests exhibited a remarkably strong correlation. One intriguing and paradoxical observation emerged: an increase in the size of the cutout within an SW column simultaneously enhanced buckling loads while reducing the structural mass. SW columns achieve a more uniform stress distribution along their length due to the presence of a continuous helical weld seam. This helical seam enables the column to efficiently distribute applied loads, minimizing localized stress concentrations. In contrast, LW columns feature weld seams that run parallel to the column's length, potentially creating stress concentrations and vulnerable areas within the structure. Consequently, the continuous nature of the helical weld seam in SW columns enhances load distribution and reduces the likelihood of stress concentration induced weaknesses compared to the linear weld seams in LW columns. This phenomenon underscores the superior load-bearing capacity conferred by the spiral welding technique, positioning SW columns as the preferred choice for applications where strength and efficiency are of paramount importance. Additionally, the data derived from both experimental tests and analytical investigations have been used to propose an equation for the calculation of stress concentration factor around cutouts in SW columns.

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来源期刊
International Journal of Steel Structures
International Journal of Steel Structures 工程技术-工程:土木
CiteScore
2.70
自引率
13.30%
发文量
122
审稿时长
12 months
期刊介绍: The International Journal of Steel Structures provides an international forum for a broad classification of technical papers in steel structural research and its applications. The journal aims to reach not only researchers, but also practicing engineers. Coverage encompasses such topics as stability, fatigue, non-linear behavior, dynamics, reliability, fire, design codes, computer-aided analysis and design, optimization, expert systems, connections, fabrications, maintenance, bridges, off-shore structures, jetties, stadiums, transmission towers, marine vessels, storage tanks, pressure vessels, aerospace, and pipelines and more.
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