A Theoretical Analysis of the ASTM E-119Standard Fire Test of Building Construction and Materials.

摘要

This report describes a theoretical analysis of the ASTM E-119Standard Fire Test. Both analytical and numerical analyses of the test are performed,indicating how various physical,chemical,and structural variables influence the fire endurance of a construction member. Walls,door,floors and ceilings in heavy timber construction are considered,represented mathematically as 'slabs'. Wood,gypsum board,and composite wood-gypsum board 'slabs'are discussed. The effects of various fire exposure conditions on the endurance time are assessed. Radiant heat transfer is the dominant heat transfer mode and reradiation properties of the exposed material have a strong influence on the fire endurance time. Thus,the true measure of fire severity is given by the heat flux to the specimen, a function of both the furnace temperature and emissivity.