Influence of Zinc Coating to a Temperature of Steel Members in Fire

This paper describes effect of hot dip galvanizing of steel structure surfaces to temperature of steel members in the fire conditions. Temperature of the set of specimens was measured during the second fire test at experimental building in Veseli nad Luznici. Experiment results show, that the zinc coating can reduce temperature in steel members especially in the first fifteen minutes of the fire. The paper describes specimens, which were used for fire test, shows testing procedure and compares measured temperatures of specimens with and without zinc coated surface. The paper also describes the process of analytical evaluation and based on the results of this evaluation specifies value of the surface emissivity for zinc coated steel members in the fire conditions.