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A series of numerical experiments were performed to study the effect of beamed ceiling on the smoke transfer and the thermal detector response in the compartment fires with beamed ceiling. The computer program used to perform the numerical simulation of the compartment fire in various conditions of fire size, beam depth, beam spacing and ceiling height was FAST(ver. 3.1.6) as 2-zone type code which was developed by Forney, G. P. The geometries of compartments and fire sizes used to simulate are the depth of 3m 4m, 5m, the Ceiling height of 3.3m, 3.5m, 4.0m and the width of 9m with beamed ceiling of 0.0m, 0.3m, 0.5m, 1.0m, the fire growth rate of slow, medium, fat, and the thermal detectors with RTI of 50㎳^(1/2), the activation temperature of 330K. The results are as follows ; (1) We conformed the distinct temperature difference of upper hot smoke layer, detector and ceiling jet inside the individual channels due to the effect of beamed ceiling in compartment fire. (2) As the beam depth and spacing in next channel of fire source become large, the upper smoke layer temperature is decrease, but we didn’t conformed that there is the effect of fire sizes on upper smoke layer temperature. (3) We conformed that the effect of beam on the thermal detector response was great as distance of detector from fire source becomes away.
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