EXPERIMENTAL BEHAVIOUR OF FLAT DECKING PROFILE COMPOSITE SLABS IN STANDARD FIRE CONDITIONS

摘要

Structural fire response of composite slabs has been the subject of extensive research in recent years.Due to its effect on heat transfer across the slab thickness, the configuration of steel decking profile plays an important role in fire resistance of composite slabs.While the design code of trapezoidal and re-entrant decking profiles are available, there is rather limited literature on fire resistance of flat decking profile.When exposed to fire, the totally embedded vertical webs and top ribs of the decking have much lower temperature compared to the bottom.Hence, the fire reinforcement required at the bottom of the slab can be reduced or even eliminated.The present paper investigates heat transfer of a series of composite slabs under the standard fire condition where a new type of flat profile steel decking is used.The study aims to provide actual temperature profile across the slab thickness for different durations (up to four hours).The temperature measurements were initially used for calibration of FE models.The FE models were also developed for trapezoidal and re-entrant profile in accordance with Eurocode 4.Part 1-2 (2005).Comparison among the three models was carried out to show the effectiveness of using flat decking in fire conditions.The test and FE results were then used to establish the temperature distribution of flat decking profile for practical design purpose.