Fire Protection of Steel Beams by Timber: Thermomechanical Analysis
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This study evaluates the possibility to use timber members as a complete or partial fire protection for steel beams. The hybrid elements considered are composed by I or T-shaped steel profiles partially or fully encased into timber members. The thermal behavior is analyzed by using numerical simulation and the fire resistance is calculated by using an analytical method. The thermomechanical behavior of different configurations is compared considering standard fire conditions. This study shows how the wood protection leads to non-uniform thermal conditions into steel profiles for the considered hybrid beams. Therefore, it is proposed to divide steel sections into subsets for a better analysis. This method allows evaluating the mechanical resistance of steel elements during fire, considering a non-uniform temperature distribution. The results indicate that timber protection delays considerably the failure of steel components during fire. The comparison of various configurations shows how fire resistance is improved by using timber-steel beams instead of unprotected steel profiles.
KeywordsTimber-steel hybrid beams Fire protection Fire resistance
This work is supported by the Tremplin Carnot MECD, the French Environment and Energy Management Agency (ADEME) and the Scientific and Technical Center for Building (CSTB).
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