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Circular hollow section X-connections near an open chord end: Stress concentration factors
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/d 0, 2γ and β) are derived.
Graphical abstract Display Omitted
Highlights SCFs of CHS-to-CHS X-connections near an open chord end are studied. 240 FE models are analyzed. CIDECT DG8 SCF formulae are found to be inaccurate. A new approach for predicting SCFs in “end connections” is proposed. The approach utilizes “SCF correction coefficients” plus CIDECT DG8 formulae.
Circular hollow section X-connections near an open chord end: Stress concentration factors
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/d 0, 2γ and β) are derived.
Graphical abstract Display Omitted
Highlights SCFs of CHS-to-CHS X-connections near an open chord end are studied. 240 FE models are analyzed. CIDECT DG8 SCF formulae are found to be inaccurate. A new approach for predicting SCFs in “end connections” is proposed. The approach utilizes “SCF correction coefficients” plus CIDECT DG8 formulae.
Circular hollow section X-connections near an open chord end: Stress concentration factors
Nejad, Ali Ziaei (author) / Sun, Min (author) / Tousignant, Kyle (author)
2020-11-12
Article (Journal)
Electronic Resource
English
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