Shear resistance of prestressed hollow core floors exposed to fire

Response of precast prestressed concrete hollowcore slabs under fire conditions

“…A review of previous fire tests indicate that, PC hollowcore slabs exposed to fire conditions are susceptible to different failure modes, through flexural and shear cracking and crushing, or bond and anchorage failure [2][3][4][5][6][7][8][9][10][11][12]. In current tests, all six slabs developed few flexural cracks originating at the bottom surface, but did not exhibit any bond or anchorage failure.…”

“…The notable fire resistance tests on PC hollowcore slab were performed by Abrams [2], Borgogno [3], Andersen and Lauridsen [4], Schepper and Anderson [5], Acker [6], Lennon [7], Fellinger et al [8] and Jensen [9], Breccolotti et al [10], Bailey and Lennon [11], and Aguado et al [12]. The test parameters included slab thickness, cover thickness to reinforcement, concrete strength and load level.…”

“…Based on these fire tests, spalling, bond slip and shear crushing were identified as possible factors contributing to failure in PC hollowcore slabs [6][7][8][9][10][11]13]. However, the influence of critical factors on fire resistance is not fully quantified and the reasoning for different failure patterns in hollowcore slabs is not well established.…”

Modeling the response of precast, prestressed concrete hollow-core slabs exposed to fire

“…The notable fire resistance tests on precast, prestressed concrete hollow-core slab were performed by Abrams, 6 Borgogno et al, 7 Breccolotti et al, 8 Bailey and Lennon, 9 Schepper and Anderson, 10 Acker, 11 Fellinger, 12 and Jensen. 13 These fire tests were performed under standard fire conditions and subjected to service loads.…”

“…Besides evaluating fire resistance, some of these researchers also studied failure mechanisms in slabs under fire conditions. [10][11][12][13] Few researchers used test data to study the extent of fire-induced spalling in precast, prestressed concrete hollow-core slabs. [14][15][16] Most of the aforementioned fire tests were performed under standard fire exposure solely to develop fire-resistance ratings for tested precast, prestressed concrete hollow-core slabs, or test data were used to extrapolate fire-resistance ratings for similar hollow-core slab configurations.…”