Nonlinear analysis of orthotropic composite slabs in fire

Yu, Xinmeng; Huang, Zhaohui; Burgess, Ian; Plank, R.J.

doi:10.1016/j.engstruct.2007.02.013

Cited by 17 publications

(10 citation statements)

References 11 publications

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“…This geometrically nonlinear model was later used to model composite concrete floors by Huang et al (2004). Yu et al (2008) presented a new model for orthotropic slabs in fire by assembly of a 9-node solid slab element and 3-node beam element. Recently, Huang (2010) extended the previous layered procedure (Huang et al 2003a, b) to take into account the effects of concrete spalling on both thermal and structural behavior of concrete slabs in fire.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Steel-Concrete Composite Structures in Fire Using OpenSees

Jian

Usmani

2014

Advances in Structural Engineering

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This paper presents the extension of the structural analysis software framework OpenSees for modeling steel framed composite structures subjected to fire including the development of a geometrically nonlinear shell element. The new shell element is formed by a combination of membrane elements and Mindlin plate bending elements using a general total Lagrangian formulation. The MITC technique (Mixed Interpolation of Tensorial Components) is applied to alleviate shear locking problems and the addition of drilling degrees of freedom is included. A new thermal load class was created to define the temperature distribution through the thickness of the shell section. The two-dimensional OpenSees material, DruckerPrager, was modified to model the concrete in the composite deck slab at elevated temperature with temperature-dependent material properties according to the Eurocode 2. A threedimensional finite element model of a composite structure was built in OpenSees, consisting of a flat reinforced concrete slab modeled by the developed shell element as well as concrete ribs and beams/columns modeled by three-dimensional beam elements. These components were connected by rigid link elements to model composite action. The performance of the developed model is verified and validated by a series of analytical solutions and experimental results respectively. Among these are: one-way bending of steel plates; fire tests on simply supported composite beams; and reinforced concrete slabs where membrane actions are investigated. Cardington restrained beam test and British Steel Corner test are also modeled. The reasonable agreement achieved between OpenSees predictions and experimental measurements shows the validity of the developed OpenSees extension to model composite structures in fire. The horizontal displacement of the column at floor level was modeled for the first time with reasonable agreement. This work is part of a wider project which, upon completion, will provide a user-friendly open-source computational platform for structural fire engineering analyses from fire dynamic simulation through to heat transfer analysis and mechanical analysis.

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Section: Introductionmentioning

confidence: 99%

Modelling of Steel-Concrete Composite Structures in Fire Using OpenSees

Jian

Usmani

2014

Advances in Structural Engineering

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confidence: 99%

“…Using a similar approach, Yu et al (2008) developed an orthotropic slab element assembled from a layered plate element representing the continuous concrete slab and a beam element representing a group of ribs. Finally, Kwasniewski (2010) and Main (2015) proposed Introduction 3 approaches in which alternating strips of layered shell elements were used to represent the thick and thin parts of a composite slab, and verification of these modeling approaches under column loss scenarios was presented through comparisons with detailed finite element analyses in which the slab was represented with solid elements and the steel decking with shell elements.…”

Section: Reinforcement Steel Deckingmentioning

confidence: 99%

“…In previous structural analyses of composite slabs under fire loading (e.g., Lamont et al, 2004;Lim et al, 2004;Foster et al, 2007;and Yu et al, 2008), temperature histories were prescribed within the structural analysis model, and the suitability of the modeling approach for thermal analysis was not considered. In considering the suitability of the various reduced-order modeling approaches previously used for structural analysis for heat transfer analysis, the grillage approach with beam elements has significant limitations, because of the inadequacy of the 1-dimensional (1D) elements to represent in-plane and through-thickness heat transfer in the slab.…”

Section: Reinforcement Steel Deckingmentioning

confidence: 99%

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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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“…For that reason, code equations are not able to describe the actual behavior of structures in fire, especially when global deformations are large and nonlinear behavior becomes relevant (Papadopoulos et al, 2008). In contrast, applications of sophisticated FEM-based (Finite Element Method) approaches have a significantly growth over the last decade (Huang et al, 2004(Huang et al, , 2009Franssen et al, 2005;Yu et al, 2008;Mourão and Silva, 2007), being able to simulate a complete structural system, including both thermal and mechanical responses to design-basis fire. Nevertheless, the amount of numerical data and the timeconsumption involved in the modeling process make it difficult to interpret the produced results.…”

Section: Introductionmentioning

confidence: 99%

Inelastic analysis of semi-rigid composite structures under fire conditions

Landesmann¹

2011

J. Braz. Soc. Mech. Sci. & Eng.

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Nonlinear analysis of orthotropic composite slabs in fire

Cited by 17 publications

References 11 publications

Modelling of Steel-Concrete Composite Structures in Fire Using OpenSees

Modelling of Steel-Concrete Composite Structures in Fire Using OpenSees

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

Inelastic analysis of semi-rigid composite structures under fire conditions

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