eprintid: 10195527
rev_number: 7
eprint_status: archive
userid: 699
dir: disk0/10/19/55/27
datestamp: 2024-08-07 14:31:34
lastmod: 2024-08-07 14:31:34
status_changed: 2024-08-07 14:31:34
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Possidente, Luca
creators_name: Couto, Carlos
creators_name: Tondini, Nicola
creators_name: Real, Paulo Vila
title: Review of design approaches for steel columns subjected to localised fires: Insights from the 2nd generation Eurocode model
ispublished: pub
divisions: UCL
divisions: B04
divisions: F44
keywords: Fire design, Thermal gradients, Localised fires, Advanced analysis, Analytical methods, Steel columns, Resilient infrastructures
note: Copyright © 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
abstract: Complex temperature fields may develop inside structural steel elements in fire, severely affecting the local and global response of the structure. However, simplified yet well-accepted design procedures allow for uniform temperature distributions in the steel elements. The second generation of Eurocodes provides advanced models for localised fires where non-negligible thermal gradients both inside the sections and along the elements are expected to influence the resistance of steel elements, especially those critical to the stability of the entire structure, such as vertical members. This paper sheds some light on the consequences of employing procedures with increasing complexity in the design of unprotected axially compressed steel columns subjected to localised fires for which the effect of the smoke layer is not significant. Five procedures were compared, considering a refinement in both the thermal and the mechanical models, culminating in the application of a procedure enabling complex temperature fields both in the section and along the column, namely the LOCAFI model, and exploiting numerical simulation in SAFIR. A parametric study was conducted, encompassing different fire scenarios and structural characteristics, resulting in 27468 analyses. It was shown that in the case of localised fire scenarios that induce significant thermal gradients in the structure advanced modelling is recommended because it better captures the thermomechanical response. Detailed considerations on relevant outcomes, such as the temperature at failure, were provided. Finally, the influence of the surrounding structure on the effectiveness of the procedures was investigated extending the parametric analysis to columns with various degrees of axial restraints.
date: 2024-09-15
date_type: published
publisher: ELSEVIER SCI LTD
official_url: https://doi.org/10.1016/j.engstruct.2024.118424
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2290605
doi: 10.1016/j.engstruct.2024.118424
lyricists_name: Possidente, Luca
lyricists_id: LPOSS45
actors_name: Possidente, Luca
actors_id: LPOSS45
actors_role: owner
funding_acknowledgements: EP/X032469/1 [UK Research and Innovation (UKRI) Institution]; CEECINST/00026/2018 [FCT - Fundacao para a Ciencia e a Tecnologia, I.P.]; L 232/2016 [Italian Ministry of Education, University and Research (MIUR)]
full_text_status: public
publication: Engineering Structures
volume: 315
article_number: 118424
pages: 15
issn: 0141-0296
citation:        Possidente, Luca;    Couto, Carlos;    Tondini, Nicola;    Real, Paulo Vila;      (2024)    Review of design approaches for steel columns subjected to localised fires: Insights from the 2nd generation Eurocode model.                   Engineering Structures , 315     , Article 118424.  10.1016/j.engstruct.2024.118424 <https://doi.org/10.1016/j.engstruct.2024.118424>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10195527/1/Possidente%20et%20al%20%282024%29%20Review%20of%20design%20approaches%20for.pdf