In this paper an experimental study on the fire damage of the unprotected structural steel members is presented after exposure to fire in an industrial fabric established for embellishment of glass wares in 1997. Following the ignited fire flashover occurred, explosions happened, and finally 50,000 m(2) areas were heavily damaged. The structural bearing system of compartments was designed as moment-resistant frames having 11.80 m height. In some halls a space truss roof construction with tubular steel bars which were joining in Mero type assemblies was pin-supported on the columns which were fix on their bottom. Steel columns were made from hot rolled I sections or built-up box sections.