Abstract
The fire resistance and the thermomechanical behaviour of Steel–Timber Composite (STC) beams are studied through 4 fire tests. 35 non-loaded reduced specimens and 2 mechanically loaded real-scale beams were tested considering standard fire conditions (ISO 834 temperature-time curve). The tested configurations consist of various steel profiles associated with timber elements in such a way that steel is fully or partially protected from fire. Timber is used as a fire-protective material since it has a low thermal conductivity and a predictable charring rate. The fire tests on non-loaded reduced specimens allowed us to investigate a wide variety of configurations and to identify key parameters. It is found that full timber protection is very efficient as steel remains below 250°C during 35 or 70 min when timber protection is respectively 30 or 50 mm thick. Moreover, timber moisture is found to have a beneficial impact on steel temperature, while hollow sections favour timber combustion and steel heating during the cooling phase. The full-scale mechanically loaded fire tests highlight the importance of assembly joints because deflection can open them, which accelerates the heating of steel. Finally, an 81 min fire resistance was measured for an STC beam with a 45 mm thick timber protection. These findings contribute to better understand the behaviour of steel–timber structural elements in fire situations. It appears that a judicious mixing of timber and steel can significantly improve the fire performance of these structural elements. The presented results can be used to improve the design of STC beams.
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References
Nabati A, Ghanbari-Ghazijahani T, Valipour HR (2021) Innovative flitch sandwich beams with steel core under four-point bending. Eng Struct 233:111724. https://doi.org/10.1016/j.engstruct.2020.111724
Fujita M, Iwata M (2013) Bending test of the composite steel–timber beam. Appl Mech Mater 351–352:415–421. https://doi.org/10.4028/www.scientific.net/AMM.351-352.415
Winter W, Tavoussi K, Riola Parada F, Bradley A (2016) Timber–steel hybrid beams for multi-storey buildings: final report. Paper presented at the World Conference on Timber Engineering
Duan S, Zhou W, Liu X, Yuan J, Wang Z (2021) Experimental study on the bending behavior of steel-wood composite beams. Adv Civil Eng 2021:1315849. https://doi.org/10.1155/2021/1315849
Jurkiewiez B, Durif S, Bouchair A, Grazide C (2022) Experimental and analytical study of hybrid steel-timber beams in bending. Structures 39:1231–1248. https://doi.org/10.1016/j.istruc.2022.03.055
European Committee for Standardization (2004): EN 1995-1-2 - Eurocode 5 - Design of timber structures - Part 1-2: General - Structural fire design
(1883) Flitch-plate, riveted and trussed girders. The American Architect and Building News 13:255–258
Twilt L, Witteveen J (1974) The fire resistance of wood-clad steel columns. Fire Prev Sci Technol 11:14–20
Uesugi S, Harada T, Namiki Y (2002) Fire resistance of sugi covering materials for structural steel. J Wood Sci 48(4):343–345. https://doi.org/10.1007/BF00831358
Shiraiwa M, Yusa S, Masuda H, Kawai T-A, Namiki Y, Saito H (2004) Fire resistance on hybrid wooden structure, Part 8: Experimental fire resistance study on self-charring-stop wooden column structure. Paper presented at the Annual meeting of Architectural Institute of Japan
Masuda H, Yusa S, Kawai T-a, Namiki Y (2004) Fire resistance of hybrid wooden structure, Part 9: Loaded fire resistance test on heavy-timber beam structure. Paper presented at the Annual meeting of Architectural Institute of Japan
Sakamoto I, Kawai N, Okada H, Yusa S (2004) Final report of a research and development project on timber-based hybrid building structures. Paper presented at the World Conference on Timber Engineering
JR East Design Corporation (2016) Kunimi town office building. Steel construction Today & Tomorrow (49):15–18
Buchanan A, Östman B (2022) Fire safe use of wood in buildings: global design guide. CRC Press, Boca Raton. https://doi.org/10.1201/9781003190318
Timbersize:
(2017). http://www.timberize.com/index.html?target=417 Accessed 03 July 2022Jang S-S, Kim Y-H, Jang Y-I, Shin I-J (2010) Fire resistance of steel column glued with structural glulam covers. Paper presented at the World Conference on Timber Engineering
Riola-Parada F, Tavoussi K, Fadai A, Winter W, Stockert L (2018) Fire performance of prefabricated timber-steel-concrete ribbed decks. Paper presented at the World Conference on Timber Engineering
European Committee for Standardization (2020) EN 1363-1 - Fire resistance tests - Part 1: General requirements
European Committee for Standardization (2002) EN 13183-1 - Moisture content of a piece of sawn timber - Part 1: Determination by oven dry method
European Committee for Standardization (2005) EN 1993-1-2 - Eurocode 3 - Design of steel structures - Part 1-2: General rules - Structural fire design
White RH, Schaffer EL (1981) Transient moisture gradient in fire-exposed wood slab. Wood Fiber Sci 13(1):17–38
Audebert M, Dhima D, Taazount M, Bouchaïr A (2014) Experimental and numerical analysis of timber connections in tension perpendicular to grain in fire. Fire Saf J 63:125–137. https://doi.org/10.1016/j.firesaf.2013.11.011
Samaké A, Taazount M, Audebert P, Palmili P (2014) Thermo-hydric transfer within timber connections under fire exposure: experimental and numerical investigations. Appl Thermal Eng 63(1):254–265. https://doi.org/10.1016/j.applthermaleng.2013.10.049
Sedighi Gilani M, Hugi E, Carl S, Palma P, Vontobel P (2015) Heat induced desorption of moisture in timber joints with fastener during charring. Fire Technol 51(6):1433–1445. https://doi.org/10.1007/s10694-014-0416-3
Alam P, Ansell M (2012) The effects of varying nailing density upon the flexural properties of flitch beams. J Civil Eng Res 2(1):7–13. https://doi.org/10.5923/j.jce.20120201.02
Łukomski M, Turkowski P, Roszkowski P, Papis B (2017) Fire resistance of unprotected steel beams-comparison between fire tests and calculation models. Procedia Eng 172:665–672. https://doi.org/10.1016/j.proeng.2017.02.078
Newman G, Simms I (1999) The cardington fire tests. North American Steel Construction Conference
Buchanan AH, Abu AK (2017) Structural design for fire safety, vol 2. Wiley, Chichester. https://doi.org/10.1002/9781118700402
(2017). Acknowledgements
Authors thank the Scientific and Technical Centre for Building (CSTB) and the Environmental and Energy Management Agency (ADEME) for funding this work. Authors thank the following companies for providing timber and steel: Gagne construction métal, Coladello, Arbonis, and Racineo.
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Béreyziat, A., Dhima, D., Durif, S. et al. Fire Tests on Steel–Timber Composite Beams. Fire Technol (2024). https://doi.org/10.1007/s10694-023-01536-y
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DOI: https://doi.org/10.1007/s10694-023-01536-y