NUMERICAL PREDICTION OF THERMAL RESPONSE OF BUILDING COMPONENTS EXPOSED TO LOCALIZED FIRES : FDM thermal analysis of a steel beam

Wakamatsu, Takashi; Pchelintsev, A. V.; Hasemi, Yuji

doi:10.3130/aijs.62.173_2

Cited by 5 publications

(7 citation statements)

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“…For quantifying the local effect of the travelling fire on adjacent structural members, Hasemi's localized fire model 2 is utilized in the ETFM framework. This correlation model was originally developed with a series of laboratory-scale fire tests [41][42][43][44] in Japan, with maximum HRR up to 900 kW. Later, additional model validation tests were conducted in Europe with fire sizes ranging from 2 to 60 MW, for both large compartments and car parks.…”

Section: Near Field: Hasemi's Localized Fire Modelmentioning

confidence: 99%

An extended travelling fire method framework for performance‐based structural design

et al. 2020

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Summary This paper presents the extended travelling fire method (ETFM) framework, which considers both energy and mass conservation for the fire design of large compartments. To identify its capabilities and limitations, the framework is demonstrated in representing the travelling fire scenario in the Veselí Travelling Fire Test. The comparison between the framework and the test is achieved through performing a numerical investigation of the thermal response of the structural elements. The framework provides good characterization of maximum steel temperatures and the relative timing of thermal response curves along the travelling fire trajectory, though it does not currently address a non‐uniform fire spread rate. The test conditions are then generalized for parametric studies, which are used to quantify the impact of other design parameters, including member emissivity, convective heat transfer coefficient, total/radiative heat loss fractions, fire spread rate, fire load density, and various compartment opening dimension parameters. Within the constraints of this study, the inverse opening factor and total heat loss prove to be the most critical parameters for structural fire design.

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Section: Near Field: Hasemi's Localized Fire Modelmentioning

confidence: 99%

An extended travelling fire method framework for performance‐based structural design

et al. 2020

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“…Hasemi's localized fire model [37], for quantifying the local effect of the travelling fire on adjacent structural members, is given by the equations below according to Eurocode 1 [39] when the fire plume is impinging the ceiling: where (W/m 2 ) is the external heat flux, is obtained through equation In implementing Hasemi's localized fire model into the ETFM framework, three key parameters should be decided at each time step: fire origin, fire diameter, (m), and heat release rate, (W) [17]. Fire origin is defined as the midpoint of the distance between the travelling fire burning front edge and back edge along the trajectory.…”

Section: Extended Travelling Fire Methods (Etfm) Frameworkmentioning

confidence: 99%

“…It is based on a mobile version of Hasemi's localized fire model [37], which quantifies the local effect of a fire on adjacent structural members, and is combined with the FIRM zone model [38] for the areas of the compartment away from the fire. This combined fire model enables the analysis to capture both spatial and temporal changes of the thermal field, thus addressing more fire dynamics than Clifton's model and Rein's model.…”

Section: Extended Travelling Fire Methods (Etfm) Frameworkmentioning

confidence: 99%

A critical review of “travelling fire” scenarios for performance-based structural engineering

Dai

Welch

Usmani

2017

Fire Safety Journal

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Many studies of the thermal and structural behaviour for large compartments in fire carried out over the past two decades show that fires in such compartments have a great deal of non-uniformity (e.g. Stern-Gottfried et al. [1]), unlike the homogeneous compartment temperature assumption in the current fire safety engineering practice. Furthermore, some large compartment fires may burn locally and tend to move across entire floor plates over a period of time. This kind of fire scenario is beginning to be idealized as travelling fires in the context of performance-based structural and fire safety engineering. This paper presents a literature review of the travelling fire research topic and its state of the art, including both the experimental and theoretical work for the past twenty years. It is found that the main obstacle of developing the travelling fire knowledge is the lack of understanding of the physical mechanisms behind this kind of fire scenario, which requires more reasonable large scale travelling fire experiments to be set up and carried out. The demonstration of the development of a new travelling fire framework is also presented in this paper, to show how current available experimental data hinder the analytical model development, and the urgent need that the new travelling fire experiments should be conducted.

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“…Details of t he FDM calculation model and discrimination equations are described in Ref. [3]. The net heat transfer to the specimen surface depends upon the surface temperature of the specimen itself.…”

Section: Approximation Of the Smoke Layermentioning

confidence: 99%

“…Subsequently, we have formulated heat flux distribution on every part of the beam as a function of heat release rate and the distance from the fire source to the member. Then we made FEM, FDM and CFD-based numerical calculation models, and the validity of these models was verified by comparing the numerical temperature results with those obtained through the experiment [2,3,4,5,6]. From the results of these studies, we demonstrated the practical feasibility of our FEM and FDM-based mo dels to predict the temperature of members, also proposed a correction method of heat flux data, and developed a heat transfer coefficient for the experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Heating Mechanism Of Unprotect4ed Steel Beam Installed Beneath Ceiling And Exposed To A Localized Fire: Verification Using The Real-scale Experiment And Effects Of The Smoke Layer

Wakamatsu¹,

Hasemi²,

Kagiya³

et al. 2003

Fire Safety Science - Proceedings of the Seventh International

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Measurements of the heating condition of a steel beam installed beneath a ceiling and exposed to a localized fire source are made on a real-scale experiment. The data of thermal response obtained from the experiments are compared with previous small-scale experiments. The effects of the smoke layer which influences upon the heating condition of the beam are investigated through the smoke experiments setting the smoke protection soffits to the same experimental equipment. FDM-based calculation is demonstrated using the average temperature of the smoke layer for the boundary conditions to predict the thermal response of the beam. Applicability of the approximated temperature of the smoke layer is examined by comparing the numerical results of the temperature with those obtained through the experiment.

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NUMERICAL PREDICTION OF THERMAL RESPONSE OF BUILDING COMPONENTS EXPOSED TO LOCALIZED FIRES : FDM thermal analysis of a steel beam

Cited by 5 publications

References 0 publications

An extended travelling fire method framework for performance‐based structural design

An extended travelling fire method framework for performance‐based structural design

A critical review of “travelling fire” scenarios for performance-based structural engineering

Heating Mechanism Of Unprotect4ed Steel Beam Installed Beneath Ceiling And Exposed To A Localized Fire: Verification Using The Real-scale Experiment And Effects Of The Smoke Layer

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