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Abstract / Description of output
The role of “travelling fires” is to ensure the robustness of structural design with large compartments under realistic fires, having a fire plume at the near-field, and a hot smoke layer preheating the ceiling at the farfield. Once the fire travels, the near-field has a leading edge representing the fire spread, and a trailing edge representing the burnout of the fuel. Though well understood by its definition, the mainstream of efforts on travelling fires for structural response is limited to 2D finite element modelling (FEM). This paper aims to identify the importance of slab inclusion with a 3D FEM structural model for steel-composite structures under travelling fires, with a special emphasis on the significance of ignoring the slab structural capacity contribution from a 2D simplified structural model. The role of fire protection scheme for 2D model against the 3D model on numerical predictions was also explored. It was found that the structural load path, and the potential structural failure mechanisms could be fundamentally different between the 3D model and the 2D model, i.e., with or without slabs. Although the 2D model tends to predict larger deflections (i.e. more conservative) than the 3D model, it could also significantly underestimate the large internal forces from the beams, which might overlook the connections failure under travelling fires. Further, due to the simplification of the 2D model omitting the significant stiffness contribution from the slab, the effect of the fire protection is likely to be amplified. It may be misleading for the performance-based structural fire design under different travelling fire scenarios. Hence, the 3D model is likely to be considered as necessary and feasible for structural fire analysis for travelling fires as a complement to the 2D model approach.
Original language | English |
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Publication status | Published - 1 Jan 2023 |
Event | SiF 2022– The 12th International Conference on Structures in Fire - Hong Kong Polytechnic University, Hong Kong, Hong Kong Duration: 30 Nov 2022 → 1 Dec 2022 https://www.sif2022.org/ |
Conference
Conference | SiF 2022– The 12th International Conference on Structures in Fire |
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Abbreviated title | SiF2022 |
Country/Territory | Hong Kong |
City | Hong Kong |
Period | 30/11/22 → 1/12/22 |
Internet address |
Keywords / Materials (for Non-textual outputs)
- Travelling fires
- 3D FEM
- steel composite structure
- performance-based design
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Dive into the research topics of 'The significance of slab for structural response under travelling fires'. Together they form a unique fingerprint.Projects
- 1 Finished
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TRAFIR: Characterization of TRAvelling FIRes in large compartments
1/07/17 → 31/12/20
Project: Research