Fire Resistance of Circular Steel Columns Filled with Fiber-Reinforced Concrete

Kodur, Venkatesh; Lie, T. T.

doi:10.1061/(asce)0733-9445(1996)122:7(776)

Cited by 81 publications

(64 citation statements)

References 3 publications

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“…All the columns in Table 1 are of fixed end conditions. Full results of the fire tests on all columns, filled with PC, RC and FC, can be found in Lie and Chabot (1992), , Kodur and Lie (1996a), Kodur and Lie (1996b). Table 1 compares the predicted column resistance to axial compression with the.…”

Section: Discussionmentioning

confidence: 99%

“…The fire resistance of the column is the standard fire exposure time at which the column load carrying capacity decreases to the level of -tlie appliea]oi!d. These calculations may be performed at different levels of complexity ranging from detailed finite element analysis (Kodur and Lie 1996a, Lie and Chabot 1990, Wang and Moore 1995, to give a complete history for the stress, strain and deflection in the column, to a design procedure in which only the column load carrying ｾｰ｡｣ｩｴ is calculated (CEN 1994). Some of the recent studies (Lie and Kodur 1996) have focused on developing simple design equations for evaluating the fire resistance of concrete filled steel columns.…”

Section: Introductionmentioning

confidence: 99%

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An approach for calculating the failure loads of unprotected concrete filled steel columns exposed to fire

Wang¹,

Kodur²

1999

Structural Engineering and Mechanics

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur.Structural Engineering and Mechanics, 7, 2, pp. 127-145, 1999-02-01 An approach for calculating the failure loads of unprotected concrete filled steel columns exposed to fire Wang, Y. C.; Kodur, V. K. R. Structural Engineering and Mechanics, 7, (2), February, pp. 127-145, February 01, 1999 The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 .... . .&2Srructural Engineering and Mechanic.., Vol. 7. No.2 (1999) [127][128][129][130][131][132][133][134][135][136][137][138][139][140][141][142][143][144][145] An approach for calculating the failure loads of unprotected concrete filled steel columns exposed to fire Abstract. This paper deals with the development of an approach for evaluating the squash load and rigidity of unprotected concrete filled steel columns at elevated temperatures. The current approach of evaluating these properties is reviewe!!. It is shown that with a non-uniform temperature distribution, over the composite cross-section, the calculations for the squash load and rigidity are tedious in the current method. A simplified approach is proposed to evaluate the temperature distribution, squash load, and rigidity of composite columns. This approach is based on the model in Eurocode 4 and can conveniently be used to calculate the resistance to axial compression of a concrete filled steel column for any fire resistance time. The accuraey of the proposed approach is assessed by comparing the predicted strengths against the results of fire tests on concrete filled circular and square steel columns. The applicability of the proposed approach to a design situation is iIlustra:ed thrOUgh a numerical example.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An approach for calculating the failure loads of unprotected concrete filled steel columns exposed to fire

Wang¹,

Kodur²

1999

Structural Engineering and Mechanics

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“…When modeling the specimens filled with steel fiber reinforced normal strength concrete, the thermal properties at high temperatures developed by Lie and Kodur [19] [20] were used.…”

Section: B) Steel Fiber Reinforced Concretementioning

confidence: 99%

Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

Ibáñez

Aguado

Romero

et al. 2015

Fire Safety Journal

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Ibañez C, Aguado JV, Romero ML, Espinos A, Hospitaler A. Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section. Fire Safety Journal. 2015; 78:10-23. doi: 10.1016/j.firesaf.2015 ABSTRACTIn this work, a method for a realistic cross-sectional temperature prediction and a simplified fire design method for circular concrete filled tubular columns under axial load are presented. The generalized lack of simple proposals for computing the crosssectional temperature field of CFT columns when their fire resistance is evaluated is evident. Even Eurocode 4 Part 1-2, which provides one of the most used fire design methods for composite columns, does not give any indications to the designers for computing the cross-sectional temperatures. Given the clear necessity of having an available method for that purpose, in this paper a set of equations for computing the temperature distribution of circular CFT columns filled with normal strength concrete is provided. First, a finite differences thermal model is presented and satisfactorily validated against experimental results for any type of concrete infill. This model considers the gap at steel-concrete interface, the moisture content in concrete and the Ibañez C, Aguado JV, Romero ML, Espinos A, Hospitaler A. Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section. Fire Safety Journal. 2015; 78:10-23. doi: 10.1016/j.firesaf.2015 2 temperature dependent properties of both materials. Using this model, a thermal parametric analysis is executed and from the corresponding statistical analysis of the data generated, the practical expressions are derived. The second part of the paper deals with the development of a fire design method for axially loaded CFT columns based on the general rules stablished in Eurocode 4 Part 1-1 and employing the concept of room temperature equivalent concrete core cross-section. In order to propose simple equations, a multiple nonlinear regression analysis is made with the numerical results generated through a thermo-mechanical parametric analysis. Once more, predicted results are compared to experimental values giving a reasonable accuracy and slightly safe results.

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“…이 를 해결하기 위한 방법으로 충전용 콘크리트에 강섬유 또는 철근을 보강하는 방법이 소개되었다. 구조적 측면에서 내부 [8], [9], [10], [11], [12], [13] 연구자는 강섬유 콘크리트 …”

Section: 서 론unclassified

An Experimental Study of Improving Fire Performance with Steel-fibers for Internally Anchored Square Composite Columns

Kim¹,

Yom²,

Kim

et al. 2014

Journal of Korean Society of Steel Construction

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-This study focuses on mixing steel fiber in the concrete to improve the ductility and toughness of the columns. The purpose of the study is to evaluate the load capacity and deformation capacity associated with the amount of steel fiber and loading condition and to analyze the interplay between the steel fiber reinforced concrete and the welding built-up square tube in terms of structure and fire resistance performance. Reinforcement of concrete with steel fiber(Vf=0.375%), when cross-section shape and boundary condition (load ratio) remained unchanged, improved fire resistance performance by 1.1~1.3 times. It is deemed that the area resisting thermal load increased and fire resistance performance was improved since the concrete reinforced with steel fiber restrained cracking. In addition, the fact that the cross-sections of the concrete were barely damaged indicates that load share capacity was greatly improved. Keywords -Steel-fiber, Fire-Performance, Internally anchored square column, Mixing ratio, Thermal stress

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Fire Resistance of Circular Steel Columns Filled with Fiber-Reinforced Concrete

Cited by 81 publications

References 3 publications

An approach for calculating the failure loads of unprotected concrete filled steel columns exposed to fire

An approach for calculating the failure loads of unprotected concrete filled steel columns exposed to fire

Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

An Experimental Study of Improving Fire Performance with Steel-fibers for Internally Anchored Square Composite Columns

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