Experimental and analytical technique for estimating interface thermal conductance in composite structural elements under simulated fire conditions

Ghojel, Jamil Ibrahim

doi:10.1016/s0894-1777(03)00113-4

Cited by 65 publications

(40 citation statements)

References 4 publications

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“…This model included a wide range of realistic and innovative considerations that have not been taken into account by other researchers. One of the novelties of the model presented here is the incorporation of the temperature dependent formulation of the interface thermal conductance proposed by Ghojel [8], which gives a very realistic prediction of the cross-sectional temperature field.…”

Section: Introductionmentioning

confidence: 99%

Advanced model for predicting the fire response of concrete filled tubular columns

Espinós

Romero

Hospitaler

2010

Journal of Constructional Steel Research

157

174

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a b s t r a c tIn this work, a nonlinear finite element three-dimensional model is presented and validated in order to study the behaviour of axially loaded concrete filled tubular (CFT) columns with circular cross-section exposed to fire. A realistic sequentially coupled nonlinear thermal-stress analysis is conducted for a series of columns available in the literature. The model is validated by comparing the simulation results with the real fire resistance tests. By means of this model, and extensive sensitivity analysis is performed over a wide range of aspects concerning the finite element modelling of the problem under study, including new key factors not studied previously. Based on this sensitivity analysis several modelling recommendations are given in this paper, which will be useful for future research work. The validated numerical model is furthermore employed to study and discuss the Eurocode 4 Part 1-2 simple calculation model, which is deeply analysed in this paper.

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Section: Introductionmentioning

confidence: 99%

Advanced model for predicting the fire response of concrete filled tubular columns

Espinós

Romero

Hospitaler

2010

Journal of Constructional Steel Research

157

174

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“…Whilst Ghojel's [23] thermal conductance model predicts the observed temperature differential gap for C-2-2-F-I-N, which is similar in scale to the tests upon which the gap conductance correlation is based, it does not necessarily reflect the gap conductance within CFS columns under all conditions (i.e. Equation 5 may not be applicable to sections where gaps do not form due to slow heating rates in protected sections).…”

Section: Capturing the Effects Of Air Gap Formationmentioning

confidence: 86%

“…It should be noted that the Eurocode guidance [4] assumes perfect contact between the steel tube and concrete core, despite the fact that previous furnace tests on CFS columns have shown the formation of a gap due to differential expansion between the steel tube and the infill concrete. No direct research has been performed to understand gap formation, although limited research has been undertaken to study its possible thermal effects [23], [24].…”

Section: Temperature Predictions In Unprotected Specimensmentioning

confidence: 99%

Furnace tests on unprotected and protected concrete filled structural hollow sections

Rush

Bisby

Gillie

et al. 2015

Fire Safety Journal

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Abstract:The accurate prediction of cross-sectional temperatures within concrete filled steel hollow (CFS) sections is critical for the accurate prediction of fire resistance. Whilst there have been many thermal and structural tests conducted on CFS columns, there are few that report the full cross-sectional thermal profile, and when they are reported, the sensor density is low, hindering the ability to validate models. This paper presents furnace tests and thermal modelling on 14 unprotected and 20 protected CFS sections, and examines the effect of several parameters on crosssectional thermal profiles, as well as assessing the accuracy of both Eurocode thermal analysis guidance and intumescent fire protection design guidance. This paper shows that; (a) the assumptions within the Eurocode guidance can lead to large over-estimations in cross-sectional temperatures; (b) proposes new thermal modelling assumptions in three key areas; and (c) shows that the current intumescent fire protection design guidance is very conservative.

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“…It should be noted that the thermal resistance at the steel-concrete interface is expressed as t i /λ i where t i is the thickness of the putative interface layer between the steel and the in-filled concrete (assumed to be 2 mm) and λ i is the thermal conductivity of the interface layer. During the thermal analysis, the density and specific heat of the interface layer are ignored [43].…”

Section: Thermal and Mechanical Propertiesmentioning

confidence: 99%

Fire Behavior of U-shaped Steel Beams Filled with Demolished Concrete Lumps and Fresh Concrete

2018

Applied Sciences

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Abstract:To reuse waste concrete in a more straightforward and simplified way, a new kind of structural member containing fresh concrete (FC) and demolished concrete lumps (DCLs) distinctly larger than conventional recycled aggregates has been proposed. Previous research has shown that, at room temperature, the mechanical performance of the U-shaped steel beams filled with DCLs and FC is similar to that of the U-shaped steel beams filled with FC alone. This research explores the fire behavior of the U-shaped steel beams filled with DCLs and FC. Five specimens including three beams filled with DCLs and FC and two reference beams filled with FC alone were tested in fire. The experimental parameters included the replacement ratio of DCLs, the longitudinal reinforcement ratio, the load ratio, and the thickness of fire insulation. Based on the test results, numerical models in which the thermal resistance at the interface between the U-shaped steel and the in-filled concrete is considered are developed using SAFIR to determine the thermal and structural responses of the specimens. Lastly, parametric studies are carried out preliminarily to investigate the effects of some parameters on the fire resistance of such beams. It is found that the replacement ratio of DCLs within a range of 0% to 33% has a very limited effect on the temperature distribution, structural response, and fire resistance of the specimens, that embedding longitudinal reinforcements can significantly increase the fire resistance of such beams, that the interface thermal resistance can generate a temperature drop of up to 280 • C at the interface between the U-shaped steel and the in-filled concrete, and that the numerical models are capable of predicting the thermal and structural responses of such beams.

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Experimental and analytical technique for estimating interface thermal conductance in composite structural elements under simulated fire conditions

Cited by 65 publications

References 4 publications

Advanced model for predicting the fire response of concrete filled tubular columns

Advanced model for predicting the fire response of concrete filled tubular columns

Furnace tests on unprotected and protected concrete filled structural hollow sections

Fire Behavior of U-shaped Steel Beams Filled with Demolished Concrete Lumps and Fresh Concrete

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