@article{ref1,
title="Structural integrity of composite floors in fire: a comparison of two large-scale experiments with varying slab reinforcement",
journal="Fire safety journal",
year="2022",
author="Ramesh, Selvarajah and Choe, Lisa",
volume="134",
number="",
pages="e103669-e103669",
abstract="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>",
language="en",
issn="0379-7112",
doi="10.1016/j.firesaf.2022.103669",
url="http://dx.doi.org/10.1016/j.firesaf.2022.103669"
}