Parametric study on structural behavior of tubular K-joints under axial loading at fire-induced elevated temperatures

Dodaran, Neda Azari and Ahmadi, Hamid ORCID: https://orcid.org/0000-0002-6192-6275 and Lotfollahi-Yaghin, Mohammad Ali (2018) Parametric study on structural behavior of tubular K-joints under axial loading at fire-induced elevated temperatures. Thin-Walled Structures, 130. pp. 467-486. ISSN 0263-8231


Abstract

Present research used the results of 405 finite element (FE) analyses to study the effect of the joint geometry on the ultimate strength and initial stiffness of tubular K-joints subjected to axial loading at fire-induced elevated temperatures. The FE models were validated against the data available from experimental tests. Structural behavior under different temperatures (200 °C, 400 °C, 500 °C, and 700 °C) was investigated and compared to the behavior at ambient temperature (20 °C). Results showed that by increasing the temperature, the ultimate strength and initial stiffness may decrease drastically. On average, the reduction of ultimate strength is 5%, 19%, 51%, and 83% at 200 °C, 400 °C, 550 °C, and 700 °C, respectively. A parametric study was conducted to investigate the effect of dimensionless geometrical parameters (β, γ, θ, and τ) on the ultimate strength and initial stiffness. Afterwards, ultimate strength data extracted from the FE analyses was compared with the values calculated from the equations proposed by available design codes in which the ultimate strength of the joint at elevated temperatures is obtained by replacing the yield stress of the steel at ambient temperature with the corresponding value at elevated temperature. It was indicated that this method may not have acceptable accuracy for carbon steel K-joints under axial loading. Hence, a new design formula was developed, through nonlinear regression analyses, to determine the ultimate strength of K-joints subjected to balanced axial loads 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: 26 Jul 2022 02:59
Last Modified: 26 Jul 2022 23:28
Uncontrolled Keywords: Axial loading; Elevated temperature; Parametric equation; Static strength; Tubular K-joint
Fields of Research (2020): 40 ENGINEERING > 4015 Maritime engineering > 401504 Ship and platform structures (incl. maritime hydrodynamics)
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/10.1016/j.tws.2018.06.014
URI: http://eprints.usq.edu.au/id/eprint/50264

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