Two-way coupled CFD fire and thermomechanical FE analyses of a self-supporting sandwich panel façade system

J.G.G.M. de Boer, Herm Hofmeyer (Corresponding author), Johan Maljaars, Ruud van Herpen

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A self-supporting sandwich panel façade system under fire is studied. First, a thermomechanical FE model, which comprises the complete façade system, and incorporates material degradation and geometrical nonlinear behaviour except for the insulation material and connections, is loaded by a fire temperature curve. Eurocode design rules then predict the screw connections of a sandwich panel will fail in shear. Secondly, an existing programme, FDS-2-Abaqus, is extended to allow its two-way coupled analyses, in which CFD fire simulations are updated for changes in the thermomechanical FE model, to be applicable to the façade system. Again, these simulations show the shear failure of the screws. Parameter studies show differences in system behaviour for improved screw properties; a fuel-controlled vs. ventilation-controlled fire; and different panel thicknesses. Interestingly, as thermal bowing of the panel retards screw failure, and thicker sandwich panels bow less than thinner panels, thicker façade panels will decrease failure time. This and other insights obtained, and the predicted failure of two tiny but critical screws within 80 s, as compared to 150 min lasting sandwich panels in standard fire tests, stresses the need to study complete systems under realistic fires, rather than to study individual components in standard fire tests. Future research will focus on detailed FE models of the connections; full-scale fire experiments; CFD temperature measurement points at the façade outside; detailed modelling of the insulation; and the effects of high temperature creep.
LanguageEnglish
Pages154-168
Number of pages15
JournalFire Safety Journal
Volume105
DOIs
StatePublished - 2019

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Facades
charge flow devices
Computational fluid dynamics
Fires
screws
Insulation
insulation
Bending (forming)
shear
ventilation
Temperature measurement
bows
Ventilation
Creep
temperature measurement
simulation
Degradation
Temperature
degradation
curves

Cite this

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title = "Two-way coupled CFD fire and thermomechanical FE analyses of a self-supporting sandwich panel fa{\cc}ade system",
abstract = "A self-supporting sandwich panel fa{\cc}ade system under fire is studied. First, a thermomechanical FE model, which comprises the complete fa{\cc}ade system, and incorporates material degradation and geometrical nonlinear behaviour except for the insulation material and connections, is loaded by a fire temperature curve. Eurocode design rules then predict the screw connections of a sandwich panel will fail in shear. Secondly, an existing programme, FDS-2-Abaqus, is extended to allow its two-way coupled analyses, in which CFD fire simulations are updated for changes in the thermomechanical FE model, to be applicable to the fa{\cc}ade system. Again, these simulations show the shear failure of the screws. Parameter studies show differences in system behaviour for improved screw properties; a fuel-controlled vs. ventilation-controlled fire; and different panel thicknesses. Interestingly, as thermal bowing of the panel retards screw failure, and thicker sandwich panels bow less than thinner panels, thicker fa{\cc}ade panels will decrease failure time. This and other insights obtained, and the predicted failure of two tiny but critical screws within 80 s, as compared to 150 min lasting sandwich panels in standard fire tests, stresses the need to study complete systems under realistic fires, rather than to study individual components in standard fire tests. Future research will focus on detailed FE models of the connections; full-scale fire experiments; CFD temperature measurement points at the fa{\cc}ade outside; detailed modelling of the insulation; and the effects of high temperature creep.",
author = "{de Boer}, J.G.G.M. and Herm Hofmeyer and Johan Maljaars and {van Herpen}, Ruud",
year = "2019",
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Two-way coupled CFD fire and thermomechanical FE analyses of a self-supporting sandwich panel façade system. / de Boer, J.G.G.M.; Hofmeyer, Herm (Corresponding author); Maljaars, Johan; van Herpen, Ruud.

In: Fire Safety Journal, Vol. 105, 2019, p. 154-168.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Maljaars,Johan

AU - van Herpen,Ruud

PY - 2019

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AB - A self-supporting sandwich panel façade system under fire is studied. First, a thermomechanical FE model, which comprises the complete façade system, and incorporates material degradation and geometrical nonlinear behaviour except for the insulation material and connections, is loaded by a fire temperature curve. Eurocode design rules then predict the screw connections of a sandwich panel will fail in shear. Secondly, an existing programme, FDS-2-Abaqus, is extended to allow its two-way coupled analyses, in which CFD fire simulations are updated for changes in the thermomechanical FE model, to be applicable to the façade system. Again, these simulations show the shear failure of the screws. Parameter studies show differences in system behaviour for improved screw properties; a fuel-controlled vs. ventilation-controlled fire; and different panel thicknesses. Interestingly, as thermal bowing of the panel retards screw failure, and thicker sandwich panels bow less than thinner panels, thicker façade panels will decrease failure time. This and other insights obtained, and the predicted failure of two tiny but critical screws within 80 s, as compared to 150 min lasting sandwich panels in standard fire tests, stresses the need to study complete systems under realistic fires, rather than to study individual components in standard fire tests. Future research will focus on detailed FE models of the connections; full-scale fire experiments; CFD temperature measurement points at the façade outside; detailed modelling of the insulation; and the effects of high temperature creep.

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