A performance indicator for structures under natural fire

Gernay, Thomas; Franssen, Jean‐Marc

doi:10.1016/j.engstruct.2015.06.005

Cited by 63 publications

(40 citation statements)

References 18 publications

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“…However, these studies have not answered the question about the influence of the additional reduction on the possible delayed failures of concrete members, which may occur long after the fire has been extinguished. The importance of exploring concrete behaviour after reaching the maximum temperatures has already been illustrated in recent scientific research [6], [7], where a new performance parameter was proposed to take into account the cooling phase in the assessment of fire resistance. The new parameter pointed to a large difference in the fire resistance of concrete members if the cooling phase of the fire curve is included in the analysis.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of lightweight concrete after fire exposure

Torić

Boko

Juradin

et al. 2016

Structural Concrete

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Section: Introductionmentioning

confidence: 99%

Mechanical properties of lightweight concrete after fire exposure

Torić

Boko

Juradin

et al. 2016

Structural Concrete

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“…It is assumed that the thermal and mechanical properties are not recovered during cooling; they keep the value corresponding to the maximum temperature that was reached. More details about the modelling assumptions for wood under natural fire exposure are given in [10].…”

Section: Model Assumptionsmentioning

confidence: 99%

A Method for Measuring the Sensitivity of Building Structural Members to Fire Decay Phases

Gernay

2016

Acta Polytech

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Firefighters face a major threat when intervening in a building during a fire: the possibility of structural collapse during the cooling phase of the fire, or soon thereafter. At present, this threat is amplified by the fact that the behaviour of structures after the time of peak gas temperature is not well understood, and is not taken into account in the design. This work presents an analysis of the behaviour of different structural members under natural fires, and develops a method for characterizing their sensitivity to fire decay phases. Thermo-mechanical numerical simulations based on the non-linear finite element method are conducted using the parametric fire model of the Eurocode to represent natural fires. The results show that, for all the members (a column, a beam) and materials (reinforced concrete, steel and timber) that are studied here, structural failure during or after the cooling phase of a fire is a possible event. The major factors that promote delayed structural failure are thermal inertia and the constituting material of the member. A method, based on a new indicator, is proposed for quantifying the propensity to delayed failure for structural members under natural fire. This work enhances the understanding of the behaviour of structures under natural fires, and has important implications for the safety of fire brigades and of people responsible for making a building inspection after a fire.

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“…Accordingly, the strength and stiffness of softwood start to decrease as soon as the temperature exceeds 20°C and they reduce to zero at 300°C. More details about the modelling assumptions for wood under natural fire exposure are given in (Gernay et al, 2015).…”

Section: Model Assumptionsmentioning

confidence: 99%

SENSITIVITY OF STRUCTURES TO FIRE DECAY PHASES, Quantitative comparison of structural components made of different materials

Gernay

2016

ASFE

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This work presents an analysis of the behaviour of different structural members under natural fires, with the aim to characterize their sensitivity to the fire decay phase. Thermo-mechanical numerical simulations based on the non-linear finite element method are conducted using the parametric fire model of Eurocode to represent the natural fires. Results show that, for all the studied members (column, beam) and materials (reinforced concrete, steel, timber), structural failure during or after the cooling phase of a fire is a possible event. The major factors that promote delayed structural failure are the thermal inertia and the constituting material of the member. An indicator is proposed to quantify the propensity to delayed failure for structural members under natural fire. This work enhances the understanding of the structural behaviour under natural fires and has implications for the safety of the fire brigades and people proceeding to a building inspection after a fire.

show abstract

A performance indicator for structures under natural fire

Cited by 63 publications

References 18 publications

Mechanical properties of lightweight concrete after fire exposure

Mechanical properties of lightweight concrete after fire exposure

A Method for Measuring the Sensitivity of Building Structural Members to Fire Decay Phases

SENSITIVITY OF STRUCTURES TO FIRE DECAY PHASES, Quantitative comparison of structural components made of different materials

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