Abstract This paper presents a numerical finite element (FE) investigation to determine stress concentration factors (SCFs) for circular hollow section (CHS)-to-CHS X-connections near an open chord end. Previous large-scale experiments are used to validate FE models, and a parametric study is performed. The parametric study consists of 240 models with variations in chord slenderness (2γ), branch-to-chord diameter ratio (β), branch-to-chord thickness ratio (τ), and chord end distance (e) on one side of the of the connection. For each of the 240 models, SCFs are determined at the crown and saddle hot-spot stress locations. Extrapolating existing formulae to predict “end-distance effects” on SCFs at these locations in CHS-to-CHS X-connections, from CIDECT Design Guide 8 (DG8), is shown to be inaccurate. Hence, SCF correction coefficients (ψ) and parametric formulae to estimate ψ (based on e/d0, 2γ and β) are derived.

中文翻译：

---

开放弦端附近的圆形空心截面 X 连接：应力集中系数

摘要 本文提出了一种数值有限元 (FE) 研究，以确定开放弦端附近圆形空心截面 (CHS) 到 CHS X 连接的应力集中系数 (SCF)。之前的大规模实验用于验证有限元模型，并进行参数研究。参数化研究由 240 个模型组成，这些模型具有弦长细度 (2γ)、支弦直径比 (β)、支弦厚度比 (τ) 和弦线末端距离 (e) 的变化。的连接。对于 240 个模型中的每一个，在冠部和鞍部热点应力位置确定 SCF。根据 CIDECT 设计指南 8 (DG8)，推断现有公式以预测 CHS 到 CHS X 连接中这些位置处 SCF 的“末端距离效应”是不准确的。因此，