10.02: Numerical simulation of fire‐resistance test of steel beam

Cábová, Kamila; Lišková, Nikola; Benýšek, Martin; Zeman, Filip; Wald, František

doi:10.1002/cepa.300

Cited by 3 publications

(3 citation statements)

References 4 publications

(4 reference statements)

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“…A very popular approach applied in the past for modelling FRTs was the consideration of the gas phase combustion and thermal heat transfer in the solid test specimen by coupled computational fluid dynamics/finite element method (CFD/FEM) simulations [e.g. (Prasad and Baum, 2005;Wickstr€ om et al, 2007;Sandstr€ om et al, 2009;Wickstr€ om et al, 2011;Yu and Jeffers, 2013;Cabova et al, 2017;Lazaro et al, 2016)]. From the references above, it can be seen that numerical studies of fluid/structure interactions in fire science started around 2000 with an increasing number in the following years.…”

Section: Numerical Modelling Of Frtsmentioning

confidence: 99%

Numerical simulation of a fire resistance test and prediction of the flue gas leakage using CFD/FEM coupling

Prieler

Pletzer

Thumser³

et al. 2023

JSFE

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PurposeIn fire resistance tests (FRTs) of building materials, a crucial criterion to pass the test procedure is to avoid the leakage of the hot flue gases caused by gaps and cracks occurring due to the thermal exposure. The present study's aim is to calculate the deformation of a steel door, which is embedded within a wall made of bricks, and qualitatively determine the flue gas leakage.Design/methodology/approachA computational fluid dynamics/finite element method (CFD/FEM) coupling was introduced representing an intermediate approach between a one-way and a full two-way coupling methodology, leading to a simplified two-way coupling (STWC). In contrast to a full two way-coupling, the heat transfer through the steel door was simulated based on a one-way approach. Subsequently, the predicted temperatures at the door from the one-way simulation were used in the following CFD/FEM simulation, where the fluid flow inside and outside the furnace as well as the deformation of the door were calculated simultaneously.FindingsThe simulation showed large gaps and flue gas leakage above the door lock and at the upper edge of the door, which was in close accordance to the experiment. Furthermore, it was found that STWC predicted similar deformations compared to the one-way coupling.Originality/valueSince two-way coupling approaches for fluid/structure interaction in fire research are computationally demanding, the number of studies is low. Only a few are dealing with the flue gas exit from rooms due to destruction of solid components. Thus, the present study is the first two-way approach dealing with flue gas leakage due to gap formation.

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Section: Numerical Modelling Of Frtsmentioning

confidence: 99%

Numerical simulation of a fire resistance test and prediction of the flue gas leakage using CFD/FEM coupling

Prieler

Pletzer

Thumser³

et al. 2023

JSFE

View full text Add to dashboard Cite

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“…It is shown in Figure that a full coupling of all interactions between the processes involved in fire resistance tests is a complicate task and was not reported in literature so far. Nevertheless, many researchers published coupled simulations between the gas phase combustion and the thermal heat conduction in the solids (see Figure A,B). In these studies, the gas phase combustion was solved by a CFD code and the thermal heat conduction by a FEM code (eg, ANSYS).…”

Section: Introductionmentioning

confidence: 99%

“…In both cases, there is strong interaction, not only from the gas phase to the solid, but also vice versa. Since the CFD/FEM interface is fixed between the gas phase combustion and the thermal heat conduction in the literature, no chemical reactions in the solid phase were considered by the FEM code, and the release of gaseous reaction products into the combustion zone (CFD simulation) was neglected. Subsequently, the concept of AST for such cases is not appropriate.…”

Section: Introductionmentioning

confidence: 99%

Development of a numerical approach based on coupled CFD/FEM analysis for virtual fire resistance tests—Part A: Thermal analysis of the gas phase combustion and different test specimens

et al. 2018

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Summary In the present two‐parted study, a numerical approach is shown to consider fire resistance tests in virtual space, including the combustion, thermal analysis of the test specimen, and the deformation process. This part is dealing with the combustion process and thermal analysis of different building materials tested in a fire resistance furnace. Instead of using coupled computational fluid dynamics (CFD)/finite element method simulation for the combustion and thermal heat conduction in the solid, which is commonly used in literature, the present approach considers these transport phenomena in one CFD simulation. This method enables a two‐way coupling between the gas phase and the solid material, where chemical reactions and the release of volatile components into the gas phase can occur (eg, release of water vapour from gypsum). To validate the numerical model, a fire resistance test of a steel door, which is a multilayer construction, and a wall made of gypsum blocks were experimentally and numerically investigated. Due to the chemical reactions inside the gypsum, water vapour is released to the gas phase reducing the flue gas temperature about 80 K. This effect was taken into account using a two‐way coupling in the CFD model, which predicted temperatures in close accordance to the measurement.

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Development of a numerically efficient approach based on coupled CFD/FEM analysis for virtual fire resistance tests—Part B: Deformation process of a steel structure

et al. 2020

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SummaryIn the present study, the structural analysis of a three‐parted steel door during a fire resistance test was examined by FEM simulation. The structural analysis is part of a coupled CFD/FEM simulation approach developed for the prediction of fire resistance tests. The basis of this follow‐up work was the calculated temperature in the test specimen from CFD to predict the thermal stresses, deformation and gap formation between the door parts. The spatial information of the temperature in the test specimen was exported. Subsequently, the thermal expansion of the door and the resulting stresses and gaps were calculated. To validate the FEM simulation, the deformation of the steel door was observed. It was found that the simulation predicted the deformation of the steel door in close accordance to the measurement. The maximum displacement was found in the centre of the construction with 141 mm, whereas the simulation predicted a value of 133 mm. In addition to the deformation of the door, also the prediction of the gap formation was validated against the flue gas leakage. The first flue gas exit occurred already after 120 seconds, which was in spatial and temporal conjunction with the maximum gap predicted in the simulation.

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10.02: Numerical simulation of fire‐resistance test of steel beam

Cited by 3 publications

References 4 publications

Numerical simulation of a fire resistance test and prediction of the flue gas leakage using CFD/FEM coupling

Numerical simulation of a fire resistance test and prediction of the flue gas leakage using CFD/FEM coupling

Development of a numerical approach based on coupled CFD/FEM analysis for virtual fire resistance tests—Part A: Thermal analysis of the gas phase combustion and different test specimens

Development of a numerically efficient approach based on coupled CFD/FEM analysis for virtual fire resistance tests—Part B: Deformation process of a steel structure

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