Experimental investigation on thermal and mechanical behaviour of composite floors exposed to standard fire

Li, Guoqiang; Zhang, Nasi; Jian, Jiang

doi:10.1016/j.firesaf.2017.02.009

Cited by 50 publications

(20 citation statements)

References 19 publications

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“…The galvalume, due to its very high ductility, could sustain very large deflections and postponed the collapse of the element. This outcome is underlined by the test results on slabs with corrugated steel decks [24,25,1]. Experimental test results on prestressed composite beam showed similar deformation responses [25].…”

Section: Materials Properties Under Elevated Temperaturementioning

confidence: 63%

Concrete-Galvalume Composite Behavior under Elevated Temperatures, Experiment and Numerical Simulation

Maryoto¹,

Aylie²,

H³

2019

Preprint

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A galvalume corrugated sheet was utilized as formwork for a reinforced concrete beam in flexure. A numerical model was validated to the experimentally obtained data, and further adopted to simulate the behavior of this composite structure under elevated temperatures. The properties and constitutive stress-strain data of the basic materials were obtained from experiments, and superimposed into the finite element model. The study concluded that the load carrying capacity of the member decreased as a direct function on temperature increase, and the cracking moment was very sensitive to the temperature fluctuation. The elevated temperatures also altered the failure mode.

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Section: Materials Properties Under Elevated Temperaturementioning

confidence: 63%

Concrete-Galvalume Composite Behavior under Elevated Temperatures, Experiment and Numerical Simulation

Maryoto¹,

Aylie²,

H³

2019

Preprint

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“…The fire resistance is plotted against the effective thickness in figure 7. The effective thickness is an arithmetical average of the thickness that takes into account the shape of the slab, equation (5 …”

Section: Comparison Of Resultsmentioning

confidence: 99%

“…The developed model presented satisfactory results for most of the tests. More recently in 2017, Guo-Qiang Li et al [5], performed 4 tests in composite slabs with steel decking, which were fire rated with 90 minutes and concluded that Eurocode 4 design calculations are conservative and that could be used for the other geometries, beyond the specified limit. The experiments were developed at Tongji University and the average temperatures of the furnace were below the standard ISO 834 [6].…”

Section: Figmentioning

confidence: 99%

Numerical simulation of the fire resistance of composite slabs with steel deck

Piloto¹,

Prates²,

Balsa³

et al. 2018

IJET

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This investigation is related with the fire resistance of composite slabs with steel deck. This composite solution consists of a concrete topping cast on the top of a steel deck. The concrete is typically reinforced with a steel mesh and may also contain individual rebars. The deck also acts as reinforcement and may be exposed to accidental fire conditions from the bottom. This composite solution is widely used in every type of buildings and requires fire resistance, in accordance to regulations. The fire resistance is specified by the loadbearing capacity (R), insulation (I) and integrity (E). The fire rating for (R) and (E) is not in the scope of this investigation. The fire rating for insulation (I) is evaluated by two different methods (numerical simulation and simple calculation). The fire rating is calculated for 32 different geometric configuration, in order to evaluate the effect of the thickness of the concrete layer and the thickness of steel deck. The fire resistance (I) increases with the thickness of the concrete when using both methods, but the simple calculation method seems to be unsafe for all the cases, requiring a revision for the formulae presented in Annex D of EN1994-1-2. A new proposal is presented.

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“…As for structural elements, related studies have been devoted to normal-strength concrete columns with circular cross-sections [19], high-strength concrete columns with quadratic cross-sections [20][21][22], RC beams, either unprotected [23] or protected by fiber-reinforced polymer laminates [24], high-performance self-compacting concrete slabs with superabsorbent polymers and polypropylene fibers [25], T-shaped beams, made of high-strength reinforced concrete [26] and prefabricated RC segments for linings of shield tunnels [27]. As for entire RC structures, testing and/or simulations were carried out for RC slabs resting on steel frames [28], slab-column connections, made of reinforced concrete [29], composite slabs with, as well as without a supporting secondary beam [30], RC frame structures [31][32][33], the Channel Tunnel between France and the United Kingdom [2,13], other monolithic tunnel linings with cross-sections in the form of a segment of a circle [34,35] , of an ellipse [36] and in the form of a double box [37], a segmental tunnel ring of a metro tunnel [38] and the twin-tube cross-section of the immersed tunnel of the Hong Kong-Zhuhai-Macao-Bridge [39].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of a Moderate Fire inside a Segment of a Subway Station

et al. 2018

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A 1:4 scaled fire test of a segment of a subway station is analyzed by means of three-dimensional Finite Element simulations. The first 30 min of the test are considered to be representative of a moderate fire. Numerical sensitivity analyses are performed. As regards the thermal boundary conditions, a spatially uniform surface temperature history and three different piecewise uniform surface temperature histories are used. As regards the material behavior of concrete, a temperature-independent linear-elastic model and a temperature-dependent elasto-plastic model are used. Heat transfer within the reinforced concrete structure is simulated first. The computed temperature evolutions serve as input for thermomechanical simulations of the fire test. Numerical results are compared with experimental measurements. It is concluded that three sources of uncertainties render the numerical simulation of fire tests challenging: possible damage of the structure prior to testing, the actual distribution of the surface temperature during the test and the time-dependent high-temperature behavior of concrete. In addition, the simulations underline that even a moderate fire represents a severe load case, threatening the integrity of the reinforced concrete structure. Tensile cracking is likely to happen at the inaccessible outer surface of the underground structure. Thus, careful inspection is recommended even after non-catastrophic fires.

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Experimental investigation on thermal and mechanical behaviour of composite floors exposed to standard fire

Cited by 50 publications

References 19 publications

Concrete-Galvalume Composite Behavior under Elevated Temperatures, Experiment and Numerical Simulation

Concrete-Galvalume Composite Behavior under Elevated Temperatures, Experiment and Numerical Simulation

Numerical simulation of the fire resistance of composite slabs with steel deck

Numerical Analysis of a Moderate Fire inside a Segment of a Subway Station

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