The fire behaviour of multi-bay, two-way reinforced concrete slabs

Abstract

This paper describes numerical modelling of the fire behaviour of two-way reinforced concrete slabs in a multi-storey multi-bay building. The building is square, with three bays in each direction. The concrete slab is supported by a perimeter frame, four internal columns and no internal beams. It is assumed that all nine bays of the concrete slab at one level are subjected to fire from below. Two fires were used; the standard ISO834 fire for a 4 hour duration, and a parametric fire based on the ISO834 fire for one hour with the temperatures decaying to ambient in another two hours. The effects of the fires are described in relation to the redistribution of bending moments and the development of tension field action in the slab.

Experimental behaviour of reinforced concrete (RC) beam to concrete-filled steel tubular (CFST) column frames subjected to ISO-834 standard fire

“…To name a few, Ali et al [16] studied the lateral displacement and collapse of singlestorey steel frames exposed to fire using numerical analysis, and based on the analysis, two modes of collapse were summarized. Moss et al [17] studied the fire behaviour of multi-bay, two-way reinforced concrete slabs exposed to fire supported by a perimeter frame; four internal columns and no internal beams were used. However, little work has been done on the fire performance of RC beam to CFST column frames, which are extensively used in China.…”

Thermo-mechanical analysis of an underground car park structure exposed to fire

“…With typical reinforcement ratios, however, the load increase can still be as high as 40-50% of the service load [5,23]. This load increase can result in an increased likelihood of punching failure which is one of the key parameters in the design of thin slab structures.…”

Structural Performance of Reinforced Concrete Flat Plate Buildings Subjected to Fire

“…Note that there in no consensus regarding the definition of f t . Concrete tensile strength was completely neglected in the numerical simulation performed by Lim et al (2004) and Moss et al (2008). Ghaffar (2005) define f t as 0.3f r , where f r is the concrete modulus of rupture.…”

“…In spite of this incident, very limited information exists regarding the vulnerability to punching failure of flat plate structures subjected to fire. Moss et al (2008) numerically studied the fire resistance of a reinforced concrete building consisting of flat plates and conjunctionally used perimeter moment frames. Elevated temperatures simulating fires with and without decay phase were applied below the slab in the entire lowest story.…”