Experimental Evaluation of Thin Composite Floor Assemblies under Fire Loading

Wellman, E.; Varma, Amit H.; Fike, Rustin; Kodur, Venkatesh

doi:10.1061/(asce)st.1943-541x.0000451

Cited by 47 publications

(16 citation statements)

References 6 publications

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“…Their observation was that, due to the mobilization of TMA, secondary beams were not needed in supporting the slabs under fire conditions, and therefore these beams could be left unprotected. However, this was not confirmed by the results of a series of tests on composite floor assemblies under fire loading, presented in 2010 by Wellman et al [11]. These were conducted as part of a study intended to consider the elimination of fire protection to interior secondary composite beams in the USA.…”

Section: Introductionmentioning

confidence: 85%

Behaviour of composite slab-beam systems at elevated temperatures: Experimental and numerical investigation

Nguyen

Tan

Burgess

2015

Engineering Structures

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This paper presents the experimental observations and results of three one-quarter scale composite slab-beam systems, 3.15m by 3.15m in plan, and tested in fire conditions. The tests aimed to examine the effects of unprotected interior secondary beams and edge rotational restraint on the behaviour of floor assemblies. The test results show that continuity of reinforcement in the slab over the supporting beams, and the presence of interior beams, can reduce the slab deflection and enhance its load-bearing capacity. Interior beams can be left unprotected without leading to a structural failure. The interior beams play a major role in helping the slab to move from biaxial bending stage to membrane behaviour, enabling the slab to mobilize higher tensile membrane forces. Rotational restraint along the protected edge beams induces intense stress concentration above these beams, resulting in more severe concrete crushing at the four corners and wide cracks over the edge beams. The test results are compared to the Bailey-BRE method adopted in SCI publication P288. The method gives conservative results for the case with unprotected interior beams. However, it is recommended that it should not be applied for slab panels without interior beams because the failure mode for these was in a "brittle" mode which would occur suddenly. In addition to the experimental study, a numerical model using ABAQUS has been developed to simulate the tests. The numerical predictions agree well with the experimental results, showing that the proposed model is reliable.

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Section: Introductionmentioning

confidence: 85%

Behaviour of composite slab-beam systems at elevated temperatures: Experimental and numerical investigation

Nguyen

Tan

Burgess

2015

Engineering Structures

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“…In addition, the connections used in beam-slab assembly FA-3 were two 101.6 × 101.6 × 6.35 mm ASTM A36 angle sections attached to the girder and beam webs by using two 19.05 mm ASTM A325 bolts at each angle leg. Further details on the connections are described by Wellman et al [13]. The thermal conductivity, dry density and compressive strength of fire insulation were 0.086 m.K, 240 kg/m 3 and 112 kPa, respectively.…”

Section: Description Of the Slab Assemblies Selected For Validationmentioning

confidence: 99%

“…More discussion on the failure criteria is provided in subsequent sections. Full details of the fire tests and results from tests can be found elsewhere [13].…”

Section: Description Of the Slab Assemblies Selected For Validationmentioning

confidence: 99%

“…In order to examine the validity of the above developed finite element model, the beam-slab assemblies tested by Wellman et al [13] are selected for validation. Then, predictions of temperatures, deflections and failure modes from three finite element analysis were compared against the experimental data of tested beam-slab assemblies FA-1, FA-2 and FA-3.…”

Section: Model Validationmentioning

confidence: 99%

“…Based on these observations, the authors concluded that the tensile membrane action significantly enhances the performance of composite floor systems under fire conditions. Wellman et al [13] carried out fire tests to evaluate the fire behavior of thin composite floor slab assemblies with different connection configurations, and fire protection schemes on the secondary beams by subjecting them to standard and non-standard fire conditions. The authors observed that no failure of shear studs occurred despite the fact that the slabs were designed for a very low composite action (25-33%).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling the response of composite beam–slab assemblies exposed to fire

Kodur

Naser

Pakala

et al. 2013

Journal of Constructional Steel Research

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Fire behavior of high‐contents recycled aggregate concrete composite slabs with small openings

Kefyalew,

Imjai,

Garcia

et al. 2024

Structural Concrete

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Recycled aggregate concrete (RAC) is increasingly being used in the construction of structural elements. However, the performance of RAC elements under fire is usually considered to be inferior to that of normal concrete (NC) elements. This study investigates the fire behavior of RAC composite steel slabs with and without openings. Ten slabs of size of 1.0 m × 2.2 m were cast either with no opening, one or two circular openings, and one or two square openings. Five of the slabs were manufactured with 100% RAC, while the other five slabs were made with NC. The concrete slabs were loaded and subjected to fire tests at a temperature of about 900°C for 120 min. Test results show that RAC composite slabs have lower stiffness (thus larger mid‐span deflections) under fire exposure compared to their counterpart NC slabs. In terms of the recorded temperature–time curves, RAC slabs showed similar performance to that of NC slabs. The ratio of soffit temperature to the temperature at the top of slab was considerably smaller for RAC slabs compared to NC slabs. RAC slabs also showed more spalling than NC slabs. Experimental test results were numerically verified using PyroSim® software with the two showing good agreement. A series of new design charts for composite RAC slabs with desired fire endurance are proposed. This study is expected to promote the wider use of RAC in construction of structural elements, particularly of composite slabs exposed to extreme temperatures.

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Experimental Evaluation of Thin Composite Floor Assemblies under Fire Loading

Cited by 47 publications

References 6 publications

Behaviour of composite slab-beam systems at elevated temperatures: Experimental and numerical investigation

Behaviour of composite slab-beam systems at elevated temperatures: Experimental and numerical investigation

Modeling the response of composite beam–slab assemblies exposed to fire

Fire behavior of high‐contents recycled aggregate concrete composite slabs with small openings

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