Effect of the load level on the resistance of composite slabs with steel decking under fire conditions

Piloto, P.A.G.; Balsa, Carlos; Santos, Lucas Ribeiro dos; Kimura, Érica

doi:10.1177/0734904119892210

Cited by 15 publications

(7 citation statements)

References 10 publications

(13 reference statements)

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“…Numerical simulations are used to evaluate the methodology, predict the behavior of building structures, obtain temperature distributions, stress and strain fields [36][37][38][39]. Generally, the numerical model will first be validated with experimental data and then analyzed to better understand the performance of the structure under both mechanical and fire conditions.…”

Section: Methodsmentioning

confidence: 99%

Thermal Characteristics of Fireproof Plaster Compositions in Exposure to Various Regimes of Fire

et al. 2022

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The problems of the fire safety of oil and gas facilities are particularly relevant due to the increasing complexity of technological processes and production. Experimental studies of steel structures with three different types of plasters are presented to determine the time taken to reach the critical temperature and loss of bearing capacity (R) of the sample, as a result of reaching a rate of deformation growth of more than 10 mm/min and the appearance of the ultimate vertical deformation. The simulation of the heating of steel structures showed a good correlation with the results of the experiment. The consumption of the plaster composition for the steel column was predicted, which allowed a 38% reduction in the consumption of fireproofing. It was found that to obtain the required fire resistance limit, it is necessary to consider the fire regime and apply plaster compositions with a thickness of 30–35 mm, depending on their thermal characteristics. The dependence of thermal conductivity and temperature on density is obtained, showing that the use of plaster compositions with a density of 200 to 600 kg/m3 is optimal to ensure a higher fire resistance limit. It is shown that the values of thermal conductivity of plaster compositions at 1000 °C are higher by 8–10% if the structure is exposed to a hydrocarbon fire regime. It is shown that the values of the heat capacity of plaster compositions at 1000 °C are higher by 10–15% if the structure is exposed to a standard fire regime.

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Section: Methodsmentioning

confidence: 99%

Thermal Characteristics of Fireproof Plaster Compositions in Exposure to Various Regimes of Fire

et al. 2022

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“…Additionally, in the model an air gap with constant thickness can be included between the steel deck and concrete topping in order to simulate the separation between these components during fire exposure, which increases the thermal resistance in this interface. In previous works, it was verified that the inclusion of an air gap makes the model more realistic (Piloto et al, 2019(Piloto et al, , 2020(Piloto et al, , 2021, even if only heat flow by conduction is considered through the air gap, due to the very small thickness of this layer.…”

Section: Composite Slabs and Fire Scenarios Used For Validation And Analysismentioning

confidence: 96%

Fire resistance of composite slabs with steel deck under natural fire

Piloto

Balsa

Gomes

et al. 2021

JSFE

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PurposeMost of the numerical research and experiments on composite slabs with a steel deck have been developed to study the effect of fire during the heating phase. This manuscript aims to describe the thermal behaviour of composite slabs when submitted to different fire scenarios, considering the heating and cooling phase.Design/methodology/approachThree-dimensional numerical models, based on finite elements, are developed to analyse the temperatures inside the composite slab and, consequently, to estimate the fire resistance, considering the insulation criteria (I). The numerical methods developed are validated with experimental results available in the literature. In addition, this paper presents a parametric study of the effects on fire resistance caused by the thickness of the concrete part of the slab as well as the natural fire scenario.FindingsThe results show that, depending on the fire scenario, the fire resistance criterion can be reached during the cooling phase, especially for the thickest composite slabs. Based on the results, new coefficients are proposed for the original simplified model, proposed by the standard.Originality/valueThe developed numerical models allow us to realistically simulate the thermal effects caused by a natural fire in a composite slab and the new proposal enables us to estimate the fire resistance time of composite slabs with a steel deck, even if it occurs in the cooling phase.

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“…Recently, full-scale 3D numerical models have been developed by Paulo Piloto and his team to evaluate the thermal behaviour of a series of composite slabs with different geometries under the action of different types of standard fires. In [10][11][12], 3D finite element models were developed to perform thermal analyses based on the insulation criterion (I), and in [11,13], a coupled thermal and mechanical model was applied to perform mechanical analyses based on the load-bearing criterion (R). The thermal models were implemented using Matlab or ANSYS software, and the mechanical model was developed using ANSYS only.…”

Section: Introductionmentioning

confidence: 99%

Modelling the Thermal Effects on Structural Components of Composite Slabs under Fire Conditions

et al. 2022

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This paper presents a finite-element-based computational model to evaluate the thermal behaviour of composite slabs with a steel deck submitted to standard fire exposure. This computational model is used to estimate the temperatures in the slab components that contribute to the fire resistance according to the load-bearing criterion defined in the standards. The numerical results are validated with experimental results, and a parametric study of the effect of the thickness of the concrete on the temperatures of the slab components is presented. Composite slabs with normal or lightweight concrete and different steel deck geometries (trapezoidal and re-entrant) were considered in the simulations. In addition, the numerical temperatures are compared with those obtained using the simplified method provided by the standards. The results of the simulations show that the temperatures predicted by the simplified method led, in most cases, to an unsafe design of the composite slab. Based on the numerical results, a new analytical method, alternative to the simplified method, is defined in order to accurately determine the temperatures at the slab components and, thus, the bending resistance of the composite slabs under fire conditions.

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Effect of the load level on the resistance of composite slabs with steel decking under fire conditions

Cited by 15 publications

References 10 publications

Thermal Characteristics of Fireproof Plaster Compositions in Exposure to Various Regimes of Fire

Thermal Characteristics of Fireproof Plaster Compositions in Exposure to Various Regimes of Fire

Fire resistance of composite slabs with steel deck under natural fire

Modelling the Thermal Effects on Structural Components of Composite Slabs under Fire Conditions

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