Fire Endurance Tests of Selected Residential Floor Construction

摘要

A series of 10 load-bearing, wood- and steel-framed residential floors was evaluated for structural fire resistance in a fire endurance furnace. Nine wood-frame and one light gauge steel-frame, protected and unprotected floor/ceiling assemblies, each measuring 3.05 x 2.44 m in size, were exposed from the underside to either the newly developed high-intensity, short-duration fire exposure or the standard ASTM E 119 time-temperature curve. The fire endurance time based on the passage of flames to the unexposed face of the floor with unprotected wood joists varied from 6 to 9 minutes under the newly developed fire exposure and 16 to 18 minutes subject to the standard ASTM fire.