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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 31166

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Energy Based Temperature Profile for Heat Transfer Analysis of Concrete Section Exposed to Fire on One Side
For fire safety purposes, the fire resistance and the structural behavior of reinforced concrete members are assessed to satisfy specific fire performance criteria. The available prescribed provisions are based on standard fire load. Under various fire scenarios, engineers are in need of both heat transfer analysis and structural analysis. For heat transfer analysis, the study proposed a modified finite difference method to evaluate the temperature profile within a cross section. The research conducted is limited to concrete sections exposed to a fire on their one side. The method is based on the energy conservation principle and a pre-determined power function of the temperature profile. The power value of 2.7 is found to be a suitable value for concrete sections. The temperature profiles of the proposed method are only slightly deviate from those of the experiment, the FEM and the FDM for various fire loads such as ASTM E 119, ASTM 1529, BS EN 1991-1-2 and 550 oC. The proposed method is useful to avoid incontinence of the large matrix system of the typical finite difference method to solve the temperature profile. Furthermore, design engineers can simply apply the proposed method in regular spreadsheet software.
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[1] O. M.A. Youssef, M. Moftah, "General stress-strain relationship for concrete at elevated temperatures", Eng. Struct., 29(10), 2007, 2618- 2634.
[2] AS 3600, Concrete structures. Australia: Committee BD-002, 2001.
[3] BS EN 1991-1-2, Actions on structures: Part 1-2 General actionsÔÇö structures exposed to fire. Brussels (Belgium): European Committee for Standardization, 2002.
[4] ACI 216.1-07, Standard method for determining fire resistance of concrete and masonry construction assemblies. Detroit: American Concrete Institute; 2007.
[5] ASTM E 119, Standard methods of fire test of building construction and materials, Test Method E119a -08. American Society for Testing and Materials, West Conshohocken, PA, 2008.
[6] ISO 834, Fire-resistance testsÔÇöelements of building constructionÔÇöPart 1: General requirements. International Standard, Geneva, 1999.
[7] S. Bratina, M. Saje, I. Planinc, "The effects of different strain contributions on the response of RC beams in fire", Eng. Struct., 29(3), 2007, 418-430.
[8] A. Law, J. Stern-Gottfried, M. Gillie, G. Rein, "The influence of travelling fires on a concrete frame", Eng. Struct., 33, 2011, 1635-1642.
[9] T.T. Lie, Structural fire protection. ASCE Manuals and Reports on Engineering Practice, No. 78, New York, NY, USA, 1992.
[10] V.R. Kodur, T.C. Wang, F.P. Cheng, "Predicting the fire resistance behaviour of high strength concrete columns", Cem. Concr. Compos., 26, 2004, 141-153.
[11] V.K.R. Kodur, M. Dwaikat, "A numerical model for predicting the fire resistance of reinforced concrete beams", Cem. Concr. Compos., 30, 2008, 431-443.
[12] S.F. El-Fitiany, M.A. Youssef, "Assessing the flexural and axial behaviour of reinforced concrete members at elevated temperatures using sectional analysis", Fire Saf. J., 44, 2009, 691-703.
[13] K. V. Wong, Intermediate Heat Transfer. New York: Marcel Dekker, INC., 2003, ch. 5.
[14] ANSYS, ANSYS multiphysics. Version 11.0 SP1. ANSYS Inc., Canonsburg (PA), 2007.
[15] BS EN 1992-1-2, Design of concrete structures. General rules. Structural fire design. Brussels (Belgium): European Committee for Standardization, 2004.
[16] ASTM E 1529, Standard Test Methods for Determining Effects of Large Hydrocarbon Pool Fires on Structural Members and Assemblies. ASTM Intl., West Conshohocken, PA., 2000.
[17] C.G. Bailey, E. Ellobody, "Fire tests on bonded post-tensioned concrete slabs", Eng. Struct., 31, 2009, 686-696.
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