Analysis of Fire Resistance of Concrete Structural Members Based on Different Fire Models: An Illustrative Example of the Slab Panel Assessment

Abstract:

The paper deals with the analysis of fire resistance of concrete structural members exposed to fire based on different fire models. An illustrative example of the assessment of a slab panel is presented. Several fire models are employed in order to predict the evolution of temperature in a selected fire compartment. Some of these fire models, namely the ISO fire curve and the parametric fire curve, are implemented in an in-house MATLAB code. For the more comprehensive fire models, external scientific software tools are used, namely the CFAST software for the zone model and the FDS software for the CFD (computational fluid dynamics) model. By employing the results of the fire simulations, the fire resistance of the slab panel is assessed. It is performed by a one-way coupled numerical procedure based on a well-known heat transfer finite element model and iterative sectional mechanical analysis. The procedure is implemented in an in-house MATLAB code. It is shown that (i) the numerical procedure can be employed in connection with different fire models and (ii) the fire resistance prediction can be strongly influenced by the type of selected fire model.

• Periodical: Solid State Phenomena (Volume 292)
• Pages: 173-182
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.292.173
• Online since: June 2019
• Authors: Martin Benýšek, Radek Štefan*, Jaroslav Procházka
• Keywords: CFAST, Concrete, FDS, Fire Model, Fire Resistance, MATLAB, Slab Panel

References

[1] Ytong - An overview of material characteristics and products. [online]. (in Czech).

[2] PyroSim User Manual. Thunderhead Engineering, (2018).

[3] M. Adelzadeh, H. Hajiloo, and M. F. Green. Numerical Study of FRP Reinforced Concrete Slabs at Elevated Temperature. Polymers, 6(2):408-422, (2014).

DOI: 10.3390/polym6020408

[4] S. M. Allam, H. M. F. Elbakry, and A. G. Rabeai. Behavior of one-way reinforced concrete slabs subjected to fire. Alexandria Engineering Journal, 52(4):749-761, (2013).

DOI: 10.1016/j.aej.2013.09.004

[5] A. Balaji, P. Nagarajan, and T. M. M. Pillai. Predicting the response of reinforced concrete slab exposed to fire and validation with IS456 (2000) and Eurocode 2 (2004) provisions. Alexandria Engineering Journal, 55(3):2699-2707, (2016).

DOI: 10.1016/j.aej.2016.06.005

[6] M. Benýšek and R. Štefan. FMC - Fire Models Calculator. CTU in Prague, (2015).

[7] A. H. Buchanan. Structural Design for Fire Safety. Wiley, (2002).

[8] S. Chen, Y. Zhang, and A. Ren. A simple method for combining fire and structural models and its application to fire safety evaluation. Automation in Construction, 87:39-48, (2018).

DOI: 10.1016/j.autcon.2017.12.015

[9] K. Chudyba and S. Serega. Structural fire design methods for reinforced concrete members. Technical Transactions Civil Engineering, 110(1-B):15-36, (2013).

[10] M. Cvetkovska, M. Knezevic, Q. Xu, C. Chifliganec, M. Lazarevska, and A. T. Gavriloska. Fire scenario influence on fire resistance of reinforced concrete frame structure. Procedia Engineering, 211:28-35, (2018).

DOI: 10.1016/j.proeng.2017.12.134

[11] M. S. Dimia, M. Geunfoud, T. Gernay, and J.-M. Franssen. Collapse of concrete columns during and after the cooling phase of a fire. Journal of Fire Protection Engineering, 21(4):245-263, (2011).

DOI: 10.1177/1042391511423451

[12] EN 1991-1-2. Eurocode 1: Actions on structures - Part 1-2: General actions - Actions on structures exposed to fire. CEN, (2002).

DOI: 10.1002/9783433601570.oth1

[13] EN 1992-1-1. Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings. CEN, (2004).

[14] EN 1992-1-2. Eurocode 2: Design of concrete structures - Part 1-2: General rules - Structural fire design. CEN, (2004).

[15] G. P. Forney. Smokeview, A Tool for Visualizing Fire Dynamics Simulation Data, Volume I: User's Guide. NIST Special Publication 1017-1, Sixth Edition, (2018).

DOI: 10.6028/nist.sp.1017-3

[16] K. Hertz. Documentation for Calculations of Standard Fire Resistance of Slabs and Walls of Concrete with Expanded Clay Aggregate. Report BYG DTU R-048, (2002).

[17] T. Lánský. Assessment of Fire Resistance of Concrete Structures with the Use of Different Fire Models. Student project, CTU in Prague, 2018. (in Czech).

[18] A. Levesque. Fire Performance of Reinforced Concrete Slabs. Master's thesis, Worcester Polytechnic Institute, 2006.[19] MATLAB. Version 8.6.0 (R2015b). The MathWorks, Inc., Natick, Massachusetts, United States, (2015).

[20] K. McGrattan, S. Hostikka, R. McDermott, J. Floyd, and M. Vanella. Fire Dynamics Simulator User's Guide. NIST Special Publication 1019, Sixth Edition, (2018).

[21] E. Nigro, G. Cefarelli, A. Bilotta, G. Manfredi, and E. Cosenza. Guidelines for flexural resistance of FRP reinforced concrete slabs and beams in fire. Composites Part B: Engineering, 58:103-112, (2014).

DOI: 10.1016/j.compositesb.2013.10.007

[22] R. D. Peacock, P. A. Reneke, and G. P. Forney. CFAST - Consolidated Model of Fire Growth and Smoke Transport (Version 7), Volume 2: User's Guide. NIST Technical Note 1889v2, (2017).

DOI: 10.6028/nist.tn.1889v1

[23] F. Pesavento, M. Pachera, P. Brunello, and B. A. Schrefler. Concrete exposed to fire: From fire scenario to structural response. In Concrete under Severe Conditions - Environment and Loading, volume 711 of Key Engineering Materials, pages 556-563. Trans Tech Publications, (2016).

DOI: 10.4028/www.scientific.net/kem.711.556

[24] L. T. Phan, T. P. McAllister, J. L. Gross, and M. J. Hurley. Best Practice Guidelines for Structural Fire Resistance Design of Concrete and Steel Buildings. NIST Technical Note 1681, (2010).

DOI: 10.6028/nist.tn.1681

[25] J. A. Purkiss. Fire safety engineering, Design of structures. Elsevier. Butterworth-Heinemann, 2nd edition, (2007).

[26] J. Rigberth. Simplified Design of Fire Exposed Concrete Beams and Columns. An Evaluation of Eurocode and Swedish Building Code Against Advanced Computer Models. Department of Fire Safety Engineering Lund University, Sweden, (2000).

[27] A. Sadaoui, A. Khennane, and M. Fafard. Fire resistance analysis of RC elements with restrained thermal elongation in a natural fire. In Computational Modelling of Concrete Structures, pages 603-608. CRC Press, (2014).

DOI: 10.1201/b16645-68

[28] R. Štefan. Transport Processes in Concrete at High Temperatures. Mathematical Modelling and Engineering Applications with Focus on Concrete Spalling. PhD thesis, CTU in Prague, (2015).

[29] R. Štefan and M. Benýšek. DataPlot - Tool for visualization of csv data. CTU in Prague, (2017).

[30] R. Štefan and J. Procházka. TempAnalysis - Computer program for temperature analysis of cross-sections exposed to fire. CTU in Prague., (2009).

[31] R. Štefan, J. Procházka, J. Novák, J. Fládr, F. Wald, A. Kohoutková, L. Scheinherrová, and M. Čáchová. Heat transfer in hybrid fibre reinforced concrete-steel composite column exposed to a gas-fired radiant heater. IOP Conference Series: Materials Science and Engineering, 246(1):012050, (2017).

DOI: 10.1088/1757-899x/246/1/012050

[32] R. Štefan, J. Sura, J. Procházka, A. Kohoutková, and F. Wald. Numerical investigation of slender reinforced concrete and steel-concrete composite columns at normal and high temperatures using sectional analysis and moment-curvature approach. Submitted.

DOI: 10.1016/j.engstruct.2019.03.071

[33] H. F. B. Xavier. Analysis of Reinforced Concrete Frames Exposed to Fire. Based on Advanced Calculation Methods . Master's thesis, University of Porto, FEUP, (2009).