TY  - JOUR
PY  - 2022//
TI  - Structural integrity of composite floors in fire: a comparison of two large-scale experiments with varying slab reinforcement
JO  - Fire safety journal
A1  - Ramesh, Selvarajah
A1  - Choe, Lisa
SP  - e103669
EP  - e103669
VL  - 134
IS  - 
N2  - This paper presents a comparison of two compartment fire experiments performed on the 9.1 m × 6.1 m composite floors using a full-scale two-story steel gravity frame to study the influence of slab reinforcement on the overall structural integrity. The floor specimens were designed to achieve a 2-h fire rating but had dissimilar slab reinforcement. The Test #1 specimen had steel wire reinforcement of 60 mm2/m width as the minimum permitted in the United States practice whereas the Test #2 specimen was reinforced with deformed steel bars (230 mm2/m) determined by incorporating tensile membrane action. The Test #1 specimen exhibited mid-panel slab integrity failure before reaching the specified fire rating period. However, the Test #2 specimen exhibited much smaller concrete cracks until it was heated up to 131 min and retained the post-fire residual strength at least two times greater than the design demand at ambient temperature. This unique large-scale testing demonstrated that the appropriate slab reinforcement scheme can delay the vertical deflection of the heated composite floor and maintain the structural integrity at large vertical displacements over a longer duration of fire exposure.<p />  <p>Language: en</p>
LA  - en
SN  - 0379-7112
UR  - http://dx.doi.org/10.1016/j.firesaf.2022.103669
ID  - ref1
ER  -