EVALUATION OF FIRE IMPACTED RAISED SLABS OF RESIDENTIAL BUILDING IN LVIV AND THEIR REINFORCEMENT

The research and analysis of technical conditions, deflections, and bearing capacity of subjected to fire impact reinforced concrete slabs of raised “panel per room” typical design model 1-480a of a five-storey residential building in Lviv are present. A study of the technical condition of floor structures in the area of high temperatures. In the area of intense fire a decrease in the bearing capacity and rigidity of the shelf of the tent floor slab under the action of high temperatures was found. Due to the fire impact, the thin plate of raised panel slabs completely loses load-bearing capacity, with large sagging deflections, caused by the plastic elongation of the wire reinforcement due to the action of high temperature. The developed design of the reinforcement of the riced plate slab is considered.