FIRE RESISTANCE TESTS ON HOLLOWCORE SLABS UNDER STANDARD AND DESIGN FIRE EXPOSURE

摘要

This paper presents results of fire resistance tests on six prestressed concrete (PC) hollowcore slabs subjected to combined loading and fire scenarios. The varied parameters in tested slabs include aggregate type, restraint condition, fire scenario and load level. In the tests, cross-sectional temperatures, mid-span deflections and restraint forces were measured throughout the fire exposure time. Data generated from fire tests show that fire scenario, load level, support conditions and aggregate type have significant effect on the fire performance of hollowcore slabs. No major spalling occurred in the slabs, and all six slabs sustained fire exposure for more than two hours before attaining failure through reaching limiting temperature on unexposed surface of the slab. Results from tests also show that, hollowcore slabs perform better under design fires than standard fires, and support restraint enhances the fire resistance of PC hollowcore slabs.