LJF of thin-walled gapped uni-planar K-type tubular steel joints with collar under brace balanced axial loads

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures Pub Date : 2024-10-23 DOI:10.1016/j.marstruc.2024.103713

Hossein Nassiraei , Hamid Reza Chavoshi , Siamak Talatahari

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Abstract

This paper investigates the efficacy of the collar plate in improving the Local Joint Flexibility (LJF) of thin-walled circular hollow section (CHS) K-joints under axial loads. Initially, a finite element model (FEM) was created and verified against data from 14 available experimental tests. Subsequently, an extensive series of 136 unreinforced and reinforced K-joints was simulated to analyze the influence of parameters such as collar plate dimensions (η and λ), brace angle (θ), and joint geometry (β, ξ, and γ) on the LJF factor (f_LJF) and the f_LJF ratio (χ). The FEMs incorporated plate-to-member contact and weld modeling. Findings indicate that the utilization of the plate reduces the f_LJF by 73 %. Additionally, it was observed that plate length significantly affects the f_LJF compared to plate thickness. While the impact of γ, θ, and ξ on χ is marginal, β, η and λ emerge as a noteworthy determinant of χ. Despite the pivotal role of f_LJF in joint behavior, there exists a gap in studies and equations specifically addressing f_LJF in collar-plate reinforced K-joints under axial loads. To address this gap, leveraging the FE results, a design equation is proposed. This equation is subsequently validated with high coefficients of determination and standards set by the UK Department of Energy.

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带套环的薄壁间隙单平面 K 型管状钢接头在支撑平衡轴向载荷作用下的 LJF

本文研究了领圈板在改善薄壁圆形空心截面（CHS）K 型关节在轴向载荷作用下的局部关节柔韧性（LJF）方面的功效。首先，创建了一个有限元模型（FEM），并根据 14 项可用实验测试的数据进行了验证。随后，对 136 个未加固和加固的 K 型接头进行了大量模拟，以分析领圈板尺寸（η 和 λ）、支撑角（θ）和接头几何形状（β、ξ 和 γ）等参数对 LJF 因子（fLJF）和 fLJF 比率（χ）的影响。有限元模型包括板件接触和焊接建模。研究结果表明，使用钢板可将 fLJF 降低 73%。此外，与钢板厚度相比，钢板长度对 fLJF 的影响更大。γ、θ 和 ξ 对 χ 的影响微乎其微，而 β、η 和 λ 则是 χ 的重要决定因素。尽管 fLJF 在关节行为中起着举足轻重的作用，但专门针对轴向载荷作用下领板式加固 K 型关节中 fLJF 的研究和方程式仍存在空白。为了弥补这一不足，我们利用有限元分析结果提出了一个设计方程。该方程随后通过英国能源部设定的高确定系数和标准进行了验证。

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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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.