Numerical study on the ultimate load of offshore two-planar tubular KK-joints at fire-induced elevated temperatures

Azari-Dodaran, Neda and Ahmadi, Hamid ORCID: https://orcid.org/0000-0002-6192-6275 (2022) Numerical study on the ultimate load of offshore two-planar tubular KK-joints at fire-induced elevated temperatures. Journal of Marine Engineering and Technology, 21 (4). pp. 205-223. ISSN 2046-4177


Abstract

A total of 270 nonlinear steady-state finite element (FE) analyses were performed on 54 FE models of two-planar CHS KK-joints subjected to axial loading at five different temperatures (20°C, 200°C, 400°C, 550°C, and 700°C). The main objective was to study the influence of temperature and dimensionless geometrical parameters on the ultimate load, failure modes, and initial stiffness of the KK-joints. Results indicated that on an average basis, the ultimate load of a two-planar tubular KK-joint at 200°C, 400°C, 550°C, and 700°C is 90%, 75%, 45%, and 16% of the joint’s ultimate load at ambient temperature, respectively. Outcomes of the parametric study showed that replacing the yield stress at ambient temperature with the corresponding value at elevated temperature, to apply the EN 1993-1-8 equations for the calculation of the joint’s ultimate load at elevated temperatures, may lead to highly unconservative results that might endanger the safety of the structure. Results of the parametric study were then used to develop a set of design formulas, through nonlinear regression analyses, to calculate the ultimate load of two-planar tubular KK-joints subjected to axial loading at elevated temperatures.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 27 Jul 2022 23:46
Last Modified: 27 Jul 2022 23:46
Uncontrolled Keywords: Ultimate load, two-planar tubular KK-joint, axial loading, elevated temperature, parametric equation
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400510 Structural engineering
40 ENGINEERING > 4005 Civil engineering > 400507 Fire safety engineering
Socio-Economic Objectives (2020): 17 ENERGY > 1702 Energy exploration > 170203 Oil and gas exploration
Identification Number or DOI: https://doi.org/10.1080/20464177.2020.1827488
URI: http://eprints.usq.edu.au/id/eprint/50483

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