In this section
@article{Rackauskaite:2019:10.1016/j.engstruct.2018.11.026,
author = {Rackauskaite, E and Kotsovinos, P and Jeffers, A and Rein, G},
doi = {10.1016/j.engstruct.2018.11.026},
journal = {Engineering Structures},
pages = {524--543},
title = {Computational analysis of thermal and structural failure criteria of a multi-storey steel frame exposed to fire},
url = {http://dx.doi.org/10.1016/j.engstruct.2018.11.026},
volume = {180},
year = {2019}
}
TY - JOUR
AB - Structural fire design, until recently, has only assumed uniform fires inside the compartment, and the assessment of structural failure has been often based on a critical temperature criterion. While this criterion, to some extent, may be able to indicate the temperature at which the structural element is near to failure, it is based on standard fire tests and, therefore, its validity is limited to individual members exposed to uniform temperatures. It is unclear how representative a critical temperature criterion is of structural failure in the case of multi-story structures, particularly in the case of non-uniform fires such as travelling fires. Therefore, the aim of this study is to assess the validity of the critical temperature criterion for structures exposed to non-uniform fires and compare it to uniform fires. A generic 10-storey steel framed building is modelled using the finite element software LS-DYNA. In total, 117 different scenarios are investigated to cover a wide range of conditions of interest for design of modern steel buildings, varying the fire exposure (travelling fires, Eurocode parametric fires, ISO-834 standard fire, and SFPE standard), floor where the fire is burning, beam section size, and applied fire protection to the beams. For the different fire exposures considered, the analysis predicts structural failure at different times, in different locations and floors, and different failure mechanisms. Moreover, it is shown that there is no single worst case fire scenario: different fires can lead to failure in different structural ways. The comparison of the various structural and thermal failure criteria (ultimate strain, utilization, mid-span deflection, and critical temperature) show that there is no consistency between them, revealing a far more complex problem than reported in the literature. Lastly, this work has illustrated that the critical temperature criterion does not predict accurately the structural failure in time, space or failu
AU - Rackauskaite,E
AU - Kotsovinos,P
AU - Jeffers,A
AU - Rein,G
DO - 10.1016/j.engstruct.2018.11.026
EP - 543
PY - 2019///
SN - 0141-0296
SP - 524
TI - Computational analysis of thermal and structural failure criteria of a multi-storey steel frame exposed to fire
T2 - Engineering Structures
UR - http://dx.doi.org/10.1016/j.engstruct.2018.11.026
UR - https://www.sciencedirect.com/science/article/pii/S0141029617338646
UR - http://hdl.handle.net/10044/1/66329
VL - 180
ER -
Phone:
+44 (0)20 7594 7036
Email:
g.rein@imperial.ac.uk
Address:
Department of Mechanical Engineering,
City & Guilds Building,
South Kensington Campus, London, SW7 2AZ, UK