Failure hazard and strengthening of roof in steel industrial building after explosion of electric furnace

An explosion of electric furnace caused a local damage of the roof in steel industrial building. This building has a saw-tooth roof covering, constructed from prestressed plates with 12.62 m of span. The explosion caused a local damage of plates prestressed ribs, which are the roof main structural elements. The technical condition of the plates has been assessed as an emergency state due to the loss of the plates’ strength and the hazard of their fall down. The damage repair has been presented herein.