Abstract
AbstractObservations from several experimental campaigns in the past years in Europe on unloaded steel members have highlighted the positive impact of hot‐dip galvanizing on the heating of steel profiles. Indeed, the temperature rises more slowly on a hot‐dip galvanized steel profile than on a bare one.This work led to a proposal for an amendment to Part 1‐2 of Eurocodes 3 and 4 regarding the fire design of steel (Eurocode 3) and composite steel and concrete (Eurocode 4) structural members. This amendment recommends a 50% reduction of the surface emissivity of a carbon steel profile as long as the applied zinc coating is present, followed by a “return to normal” of the fire behaviour of steel once the zinc layer has melted.Therefore, an experimental campaign was conducted in order to verify the recommendations of the proposed amendment on the one hand, and to calibrate an advanced calculation model on the other hand. This investigation, presented in this paper, has put into evidence the conservativeness of the proposed amendment. The latter can have a significant impact on the fire design of steel structures for low fire resistance requirements, especially in case of welded structural members which are often made of slender walls prone to heat up very quickly when exposed to a fire.
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