Determination of the fire resistance of prestressed concrete slab with unbonded reinforcement
Keywords:fire resistance, fire resistance limits, temperature regime, brittle failure, humidity
Purpose. The article is dedicated to features of determination of the fire resistance of prestressed concrete slab with unbonded reinforcement.
Methods. The fire test concrete slabs with unbonded reinforcement of the fire resistance.
Findings. The probability of occurrence of fragile destruction of prestressed concrete slab with unbonded reinforcement of the compressed zone is considered. The fire resistance limit of prestressed concrete slab with unbonded reinforcement and critical temperature for reinforcement are determined. Inverse problem on determination of fire resistance defined the critical temperature for reinforcement. The schemes of slabs destruction are reviewed.
Application field of research. The obtained experimental study data could be used in calculation and design of prestressed concrete slab with unbonded reinforcement.
Conclusions. The scheme of destruction of test samples meet the standard scheme of destruction of prestressed concrete slabs with unbonded reinforcement, while the rate of destruction is much higher and the critical temperature of reinforcement is much lower. For prestressed concrete slab with unbonded reinforcement by fire effect is typical strong brittle fracture in the compressed construction zone. As the brittle fracture can’t be avoided in view of the specific of structures, it is necessary to apply the constructive solutions for the protection of the protective concrete layer.
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