Experimental investigation into fire behaviour of glazed facades with pendant type sprinklers

摘要

Facade systems play an important role in fire compartmentation of a building and reducing the likelihood of fire spreading through and outside of the building walls. The use of sprinklers in building regulations often allows for smaller building separation. However, no additional benefits are usually given to additional internal sprinkler protection of the external glass facade using standard pendant sprinklers. Four compartment fire experiments were performed with non-fire-rated aluminium facades with two- and three-layered Insulating Glass Units (IGU), protected by pendant-type sprinklers (DN15, K-factor = 80, T = 68 degrees C). Sprinklers were in row 14-55 cm from the glazing, with 1.514-1.83 m separation distance. In all experiments, facades achieved satisfactory performance in terms of glazing integrity, insulation and reducing the thermal radiation. Under a non-uniform water distribution, parts of the glass were dry (1.7%-15.7% of IGU area), where we have observed soot deposition and local damage to fire exposed glass layer, but no loss of the structural integrity. The temperatures on the unexposed side did not exceed 86 degrees C, the peak measured temperature of the internal glass surface was 173 degrees C. The performed experiments confirmed the capability of standard pendant-type sprinklers to enhance the fire protection features of a building facade.