Fire Resistance of Protected Slim Floors

Abstract

The insulating effectiveness of intumescent coatings for fire protection is evaluated, using computer models and software, based on fire test data. The procedure include: (i) examination of testing set-up and data, and correction of temperature data obtained from small furnace tests on unloaded beams; (ii) evaluation of beam temperature distribution as a function of protective coating type and thickness; (iii) calculations of moment resistance and load ratio for any given coating thickness and the determination of minimum coating thickness required for different periods of fire resistance up to 120 min; (iv) extension of calculation results for different beam sizes; (v) examination of the effect of service holes; (vi) assessment for different types of coatings on asymmetric beams by comparison with test data on Slimflor beams. The coating thickness sufficient for all types of slim floor construction is obtained.