Possidente, Luca;
Cvetanoski, Boban;
Tondini, Nicola;
Freddi, Fabio;
(2024)
Progressive collapse of steel frames subjected to parametric fire curves.
In: Da Silva, Luís Simões and Real, Paulo Vila and Santiago, Aldina and Craveiro, Hélder and Laím, Luís, (eds.)
Proceedings of the 13th International Conference on Structures in Fire (SiF'24).
(pp. pp. 1277-1286).
CMM – Portuguese Steelwork Association: Coimbra, Portugal.
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Abstract
Extreme events such as terrorist attacks, vehicle impacts, and fires cause local damage to the buildings, which may spread from element to element, inducing progressive collapse. Steel structures are characterised by a high risk of progressive collapse owing to their high vulnerability (e.g., low structural redundancy, joint behaviour), high hazard, and exposure (e.g., they are often employed for large industrial or strategic buildings occupied by a large number of people). Therefore, steel structures should be carefully designed to mitigate the risk of progressive collapse. Despite being a rare event, fire may lead to the progressive collapse of the structure, and this paper investigates the progressive collapse of a seismically designed 9-storey steel moment-resisting frame subjected to different parametric fire scenarios and various loading levels. The response of critical components was validated against experimental data and standard prescriptions to accurately simulate both beam-type (i.e., ductile plastic hinges and catenary action) and column-type (i.e., non-ductile buckling) mechanisms. Various parametric fires and scenarios affecting ground-storey columns were considered. It is shown that the fire affecting one column may induce buckling of the adjacent ones (i.e., column-type mechanism). This is in contrast with the typical considerations on progressive collapse at ambient temperature, which assume beam-type mechanisms. The mechanisms of collapse are described in detail and the influence of the fire parameters and the loading levels are outlined.
| Type: | Proceedings paper |
|---|---|
| Title: | Progressive collapse of steel frames subjected to parametric fire curves |
| Event: | 13th International Conference on Structures in Fire (SiF'24) |
| Location: | Coimbra, Portugal |
| Dates: | 19 Jun 2024 - 21 Jun 2024 |
| ISBN-13: | 978-989-35292-2-5 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.30779/cmm_SIF24 |
| Publisher version: | https://doi.org/10.30779/cmm_SIF24 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Progressive collapse; Parametric fires; Steel structures; Risk mitigation |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10195526 |
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