Advanced Modeling of Composite Slabs with Thin-Walled Steel Sheeting Submitted to Fire

Pantousa, Daphne; Mistakidis, E.S.

doi:10.1007/s10694-012-0265-x

Cited by 17 publications

(7 citation statements)

References 11 publications

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Section: Reinforcement Steel Deckingmentioning

confidence: 99%

“…Lamont et al (2004) and Guo (2012) introduced interface elements to model heat transfer between the steel deck and the concrete slab in finite element thermal analyses of composite slabs. Pantousa et al (2013) simplified the modeling of this interface in thermo-mechanical analysis of composite slabs by sharing nodes betw een the shell elements representing the steel decking, and the solid elements representing the adjacent concrete, by assuming continuity of temperature at their interface.Challenges in structural analysis of composite slabs include properly accounting for the orthotropic behavior associated with the profiled decking, as well as capturing the effects of material and geometric nonlinearities expected during the response. While a few studies have used detailed models with solid elements to analyze the structural response of composite slabs in analyses of column loss at ambient room temperatures (e.g., Sadek et al, 2008;and Alashker et al, 2010), reduced-order modeling approaches are generally preferable for simulating large-scale composite frames.…”

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Numerical modeling and analysis of heat transfer in composite slabs with profiled steel decking

Jian¹,

Main²,

Sadek³

et al. 2017

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This report presents detailed and reduced-order finite element modeling of heat transfer in composite floor slabs with profiled steel decking. The detailed modeling approach uses solid elements for the concrete slab and shell elements for the steel decking. The reduced-order modeling approach represents the thick and thin parts of a composite slab with alternating strips of layered shell elements . In the reduced-order modeling approach, a linear gradient in the density of concrete in the rib is used to represent the tapered profile of the rib. In order to more accurately account for the heat input through web of the steel decking in the reducedorder models, the specific heat of concrete in the rib is modified and a dummy material with low specific heat and high thermal conductivity is added in the thin part of the slab. The detailed modeling approach is validated against experimental results available in the literature, and the reduced-order modeling approach is calibrated against the detailed model results and validated against experimental data. A parametric study using the detailed modeling approach is carried out to investigate the influence of the thermal boundary conditions, thermal properties of materials, and slab geometry on the temperature distribution in the composite slab. The results show that the rib height of the decking and the width at the top of the rib are key factors governing the temperature distribution in the rib. In addition, a mesh-sensitivity analysis is performed to investigate the extent to which the element size could be increased while maintaining sufficient accuracy.Keywords: heat transfer; composite slab; detailed model; reduced-order model. ______________________________________________________________________________________________________This publication is available free of charge from: https://doi.org/10.6028/NIST. TN.1958 iv PREFACEThe numerical study reported herein is part of a comprehensive research program being carried out by the National Institute of Standards and Technology (NIST) on performance-based design methodologies for structures in fire. ______________________________________________________________________________________________________This publication is available free of charge from: https://doi.org/10.6028/NIST. TN.1958 v Analyzing the response of composite slabs to fire-induced thermal loading requires both heat transfer analyses and structural analyses. The temperatures resulting from heat transfer influence the structural response of the slab through thermal expansion and through degradation of material stiffness and strength. Thermal gradients through the depth of the slab can also produce curvatures, potentially introducing additional bending moments into the floor system. Both thermal and structural analyses of composite slabs present their own unique challenges, and different types of models would typically be used for each analysis. This introduces an additional challenge of transferring analysis results between models with p...

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Section: Reinforcement Steel Deckingmentioning

confidence: 99%

mentioning

confidence: 99%

Numerical modeling and analysis of heat transfer in composite slabs with profiled steel decking

Jian¹,

Main²,

Sadek³

et al. 2017

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“…In composite steel and concrete structures, as both structural materials are responsible for the mechanical resistance, they should ensure the structural integrity of the element in case of fire. In these slabs, the profiled steel decking acts as a continuous positive reinforcement and eliminate the need of formwork and steel rebars [1], [2]. When these slabs are subjected to fire on their bottom surface, the steel of the decking degrades leading the slab to behave as non-reinforced.…”

Section: Introductionmentioning

confidence: 99%

Temperature field of composite steel and concrete slabs in fire situation

Bolina

Rodrigues

2024

Rev. IBRACON Estrut. Mater.

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Composite steel decking concrete slabs are an important structural member in building construction. Research on its thermal behavior should be developed to understand its fire performance. In this paper, a comparison of the temperature distribution in the cross-section of steel decking concrete slabs subjected to fire is made through three different procedures: (a) standardized analytical, (b) experimental and (c) numerical. The analytical method was the one proposed in NBR 14323 standard. The experimental tests corresponding to eight real-scale fire tests on composite slabs carried out by the authors. The numerical tests were done for the same configurations of the experimental tests and used the FEA software Abaqus. Steel decking temperatures obtained with NBR 14323 methodologies showed good convergence with the experimental and numerical ones. The same was not observed for the concrete, positive and negative rebar.

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“…This would allow the same model to be used for both types of analysis, facilitating the analysis of structural response under various fire scenarios, with realistic thermal loading applied from computational simulations of fire dynamics. Numerical analysis of heat transfer in composite slabs typically uses a high-fidelity finite element modeling approach, with solid elements for the concrete slab and shell elements for the steel decking [1][2][3][4]. This approach can realistically simulate the orthotropic behavior of composite slabs, but requires significant computing time.…”

Section: Introductionmentioning

confidence: 99%

Reduced-order thermal analysis of fire effects on composite slabs

Jian¹,

Main²,

Weigand³

et al. 2018

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This paper describes a reduced-order modeling approach for thermal analyses of composite slabs with profiled decking. The reduced-order modeling approach consists of alternating strips of layered shell elements, representing the thick and thin portions of slab. Layered shell elements representing the thick portion of the slab adopt a linear reduction in the density of concrete within the rib to account for the tapered profile of the ribs. A "dummy material" with low specific heat and high through-thickness thermal conductivity is used to represent the voids between the ribs. The specific heat of concrete in the rib is also modified to indirectly consider the heat input through the web of the decking. The optimal ratio of modified to actual specific heat of concrete in the rib is determined, depending on the ratio of the height of the upper continuous portion to the height of the rib. The reduced-order modeling approach is validated against experimental results.

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Advanced Modeling of Composite Slabs with Thin-Walled Steel Sheeting Submitted to Fire

Cited by 17 publications

References 11 publications

Numerical modeling and analysis of heat transfer in composite slabs with profiled steel decking

Numerical modeling and analysis of heat transfer in composite slabs with profiled steel decking

Temperature field of composite steel and concrete slabs in fire situation

Reduced-order thermal analysis of fire effects on composite slabs

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