Temperatures and thermal boundary conditions in reverse channel connections to concrete filled steel sections during standard and natural fire tests

Tomas Jana; Yong C Wang; Frantisek Wald; Kamila Horova

doi:10.1016/j.firesaf.2015.08.002

Temperatures and thermal boundary conditions in reverse channel connections to concrete filled steel sections during standard and natural fire tests

Tomas Jana, Yong C Wang, Frantisek Wald, Kamila Horova

Research output: Contribution to journal › Article › peer-review

Abstract

The paper presents fire testandnumericalsimulationresultsoftemperaturedistributionsinreverse channel connections to concrete-filled tubular columns during standard and natural fire tests.The experiments included a furnace fire test with the composite frame subjected to increasing fire temperature according to the ISO834 standard time–temperature curve and two natural fire tests in a full-scale structure including a cooling phase. These fire tests examined the effects of fire protection,different connection locations and different connection dimensions.Temperatures at different connection components were recorded.The recorded connection component temperatures were simulated by using the SAFIR fire engineering software to calibrate the thermal boundary conditions in different connection components. From the numerical simulation results,it has been concluded that radiation to the inner surfaces of the reverse channel and the adjacent part of the column tube is only from the gas volume bounded by these surfaces. A lower flame emissivity value than the standard value should be used. For simplicity,a value of εf=0.1 is proposed. Also a lower value of the convective heat transfer coefficient of 10W/m2K can be used in the connection area.

Original language	English
Pages (from-to)	55-70
Number of pages	15
Journal	Fire Safety Journal
Volume	78
DOIs	https://doi.org/10.1016/j.firesaf.2015.08.002
Publication status	Published - 2015

Keywords

Reverse channel connection Concrete filled tube Heat transfer Fire test Temperature calculation Flame emissivity Numerical model SAFIR

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10.1016/j.firesaf.2015.08.002

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@article{ffc568408ef44308beaa0a173d5676e3,

title = "Temperatures and thermal boundary conditions in reverse channel connections to concrete filled steel sections during standard and natural fire tests",

abstract = "The paper presents fire testandnumericalsimulationresultsoftemperaturedistributionsinreverse channel connections to concrete-filled tubular columns during standard and natural fire tests.The experiments included a furnace fire test with the composite frame subjected to increasing fire temperature according to the ISO834 standard time–temperature curve and two natural fire tests in a full-scale structure including a cooling phase. These fire tests examined the effects of fire protection,different connection locations and different connection dimensions.Temperatures at different connection components were recorded.The recorded connection component temperatures were simulated by using the SAFIR fire engineering software to calibrate the thermal boundary conditions in different connection components. From the numerical simulation results,it has been concluded that radiation to the inner surfaces of the reverse channel and the adjacent part of the column tube is only from the gas volume bounded by these surfaces. A lower flame emissivity value than the standard value should be used. For simplicity,a value of εf=0.1 is proposed. Also a lower value of the convective heat transfer coefficient of 10W/m2K can be used in the connection area.",

keywords = "Reverse channel connection Concrete filled tube Heat transfer Fire test Temperature calculation Flame emissivity Numerical model SAFIR",

author = "Tomas Jana and Wang, {Yong C} and Frantisek Wald and Kamila Horova",

note = "The research was supported by funding from the European Community{\textquoteright}s Research Fund for Coal and Steel(RFCS) under the Grant agreement no.RFSR-CT-2009-00021(COMPFIRE) and the European Social Fund within the framework of realizing the project “Support of Inter-sectoral Mobility and Quality Enhancement of Research Teams at the Czech Technical University in Prague”, CZ.1.07/2.3.00/30.0034,period of the project's realization1/12/ 2012–30/6/2015.",

year = "2015",

doi = "10.1016/j.firesaf.2015.08.002",

language = "English",

volume = "78",

pages = "55--70",

journal = "Fire Safety Journal",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Temperatures and thermal boundary conditions in reverse channel connections to concrete filled steel sections during standard and natural fire tests

AU - Jana, Tomas

AU - Wang, Yong C

AU - Wald, Frantisek

AU - Horova, Kamila

N1 - The research was supported by funding from the European Community’s Research Fund for Coal and Steel(RFCS) under the Grant agreement no.RFSR-CT-2009-00021(COMPFIRE) and the European Social Fund within the framework of realizing the project “Support of Inter-sectoral Mobility and Quality Enhancement of Research Teams at the Czech Technical University in Prague”, CZ.1.07/2.3.00/30.0034,period of the project's realization1/12/ 2012–30/6/2015.

PY - 2015

Y1 - 2015

N2 - The paper presents fire testandnumericalsimulationresultsoftemperaturedistributionsinreverse channel connections to concrete-filled tubular columns during standard and natural fire tests.The experiments included a furnace fire test with the composite frame subjected to increasing fire temperature according to the ISO834 standard time–temperature curve and two natural fire tests in a full-scale structure including a cooling phase. These fire tests examined the effects of fire protection,different connection locations and different connection dimensions.Temperatures at different connection components were recorded.The recorded connection component temperatures were simulated by using the SAFIR fire engineering software to calibrate the thermal boundary conditions in different connection components. From the numerical simulation results,it has been concluded that radiation to the inner surfaces of the reverse channel and the adjacent part of the column tube is only from the gas volume bounded by these surfaces. A lower flame emissivity value than the standard value should be used. For simplicity,a value of εf=0.1 is proposed. Also a lower value of the convective heat transfer coefficient of 10W/m2K can be used in the connection area.

AB - The paper presents fire testandnumericalsimulationresultsoftemperaturedistributionsinreverse channel connections to concrete-filled tubular columns during standard and natural fire tests.The experiments included a furnace fire test with the composite frame subjected to increasing fire temperature according to the ISO834 standard time–temperature curve and two natural fire tests in a full-scale structure including a cooling phase. These fire tests examined the effects of fire protection,different connection locations and different connection dimensions.Temperatures at different connection components were recorded.The recorded connection component temperatures were simulated by using the SAFIR fire engineering software to calibrate the thermal boundary conditions in different connection components. From the numerical simulation results,it has been concluded that radiation to the inner surfaces of the reverse channel and the adjacent part of the column tube is only from the gas volume bounded by these surfaces. A lower flame emissivity value than the standard value should be used. For simplicity,a value of εf=0.1 is proposed. Also a lower value of the convective heat transfer coefficient of 10W/m2K can be used in the connection area.

KW - Reverse channel connection Concrete filled tube Heat transfer Fire test Temperature calculation Flame emissivity Numerical model SAFIR

U2 - 10.1016/j.firesaf.2015.08.002

DO - 10.1016/j.firesaf.2015.08.002

M3 - Article

VL - 78

SP - 55

EP - 70

JO - Fire Safety Journal

JF - Fire Safety Journal

ER -

Temperatures and thermal boundary conditions in reverse channel connections to concrete filled steel sections during standard and natural fire tests

Abstract

Keywords

UN SDGs

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