Termal analysis of reinforced concrete beams subjected to localized fire using CFD-FEM models
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The versatility and high load capacity of reinforced concrete are the main reasons for its massive use in various infrastructures such as buildings, bridges, among others. Outside of normal operating loads, these structures can be subjected to accidental loads such as those generated by localized fires. Current regulations offer some options for analyzing this type of phenomena. Models based on Computational Fluid Dynamics (CFD) are the most suitable; However, given its complexity, its use is not widespread, opting for simplified methodologies. This work shows a methodology that couples CFD models for fire simulation and thermal models in Finite Elements (EF), to obtain the temperature field of a reinforced concrete beam subjected to a localized fire scenario. The analysis was carried out with a sequentially coupled unidirectional model in which, after extracting the heat transfer coefficients and adiabatic surface temperatures from the CFD model, these values are included (after manipulation using a FORTRAN program) in the EF model, to obtain the temperature fields. With the results obtained, it is concluded that the use of this methodology allows the temperatures in the beam to be adequately estimated for the case considered, making it possible to use them in a subsequent thermo-mechanical analysis.
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References
Alos, J., Paya, I., Hospitaler, A., & Rinaudo, P. (2017). Valencia bridge fire tests: Experimental study of a composite bridge under fire. Journal of Constructional Steel Research, 138, 538–54. https://doi.org/10.1016/j.jcsr.2017.08.008.
Balaji A., Luquman, K., Nagarajan, P., & Madhavan, T. (2016). Studies on the behavior of Reinforced Concrete Short Column subjected to fire. Alexandria Engineering Journal, 55,475–86. https://doi.org/10.1016/j.aej.2015.12.022.
Buttignol, T. (2022). Analytical and numerical analyses of RC beams exposed to fire adopting a LITS trilinear constitutive law for concrete. Case Studies in Construction Materials, 17: e01619. https://doi.org/10.1016/j.cscm.2022.e01619.
European Committee for Standardization (1992). EN 1992-1-2: Eurocode 2: Design of concrete structures - Part 1-2: General rules - Structural fire design. https://www.phd.eng.br/wp-content/uploads/2015/12/en.1992.1.2.2004.pdf.
European Committee for Standardization. (2002). EN 1991-1-2: Eurocode 1: Actions on structures - Part 1-2: General actions - Actions on structures exposed to fire. British Standards Institution. https://www.phd.eng.br/wp-content/uploads/2015/12/en.1991.1.2.2002.pdf.
European Committee for Standardization. (2005). EN 1993-1-2: Eurocode 3: Design of steel structures - Part 1-2: General rules - Structural fire design. British Standards Institution. https://library.um.edu.mo/dissertation/b21618677.pdf.
Feenstra, J., Hofmeyer, H., Van Herpen, R., &, Mahendran M. (2018). Automated two-way coupling of CFD fire simulations to thermomechanical FE analyses at the overall structural level. Fire Saf J , 96:165–75. https://doi.org/10.1016/j.firesaf.2017.11.007.
Hurley, M., Gottuk, D., Hall, J., Harada, K., Kuligowski, E., Puchovsky, M., et al. SFPE handbook of fire protection engineering, fifth edition. 2016. https://doi.org/10.1007/978-1-4939-2565-0.
Manco, M., Vaz, M., Cyrino, J., Landesmann, A. (2013). Behavior of stiffened panels exposed to fire. In: Romanoff J, Guedes Soares C, editors. Analysis and Design of Marine Structures, CRC Press; 101–8. https://doi.org/10.1201/b15120-16.
Manco, M., Vaz, M., Cyrino, J., & Landesmann, A. (2018). Ellipsoidal Solid Flame Model for Structures Under Localized Fire. Fire Technology, 54:1505–1532. https://doi.org/10.1007/s10694-018-0750-y.
Manco, M., Vaz, M., Cyrino, J., Landesmann, A. (2020). Evaluation of localized pool fire models to predict the thermal field in offshore topside structures. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 42:613. https://doi.org/10.1007/s40430-020-02694-8.
Manco, M., Vaz, M., Cyrino J., & Landesmann A. (2021a). Thermomechanical performance of offshore topside steel structure exposed to localised fire conditions. Marine Structures, 76:102924.https://doi.org/10.1016/j.marstruc.2020.102924.
Manco, M., Vaz, M., Cyrino, J., & Landesmann A. (2021b). A study on the use of fireproof protection in offshore topside steel structures subject to localised fires. Marine Systems & Ocean Technology, 16, 55 – 68 (2021). https://doi.org/10.1007/s40868-021-00102-x.
McGrattan, K., Hostikka, S., McDermott, R., Floyd, J., Weinschenk, C., & Overholt, K. (2013). Fire Dynamics Simulator, Technical Reference Guide, vol 1: Mathematical Model https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.1018e6.pdf.
McGrattan, K., Hostikka, S., McDermott, R., Floyd, J., Weinschenk, C., & Overholt, K. (2013). Fire Dynamics Simulator, User’s Guide. https://doi.org/http://dx.doi.org/10.6028/NIST.SP.1019.
Payá, I., & Garlock, M. (2012). A numerical investigation on the fire response of a steel girder bridge. Journal of Constructional Steel Research, 75:93–103. https://doi.org/10.1016/j.jcsr.2012.03.012.
Quintiere, J. (2006). Fundamentals of Fire Phenomena. https://doi.org/10.1002/0470091150.
Ryu, M., He, K., Lee, D., Park, S., Thomas, G., & Paik, J. (2021). Finite element modeling for the progressive collapse analysis of steel stiffened-plate structures in fires. Thin-Walled Structures, 159, 107262. https://doi.org/10.1016/j.tws.2020.107262.
Silva, J., Landesmann, A., & Ribeiro, F. (2016). Fire-thermomechanical interface model for performance-based analysis of structures exposed to fire. Fire Safety Journal, 83:66–78. https://doi.org/10.1016/j.firesaf.2016.04.007.
Simulia, D (2012). Abaqus 6.12 documentation. Providence, Rhode Island, US 2012:6. https://doi.org/10.1097/TP.0b013e31822ca79b.
Sjöström, J., Byström, A., Lange, D., & Wickström, U. (2012). Thermal exposure to a steel column from localized fires. SP Technical Research Institute of Sweden https://www.researchgate.net/publication/259357457_Thermal_exposure_to_a_steel_column_from_localized_fires.
Song, Y., Fu, C., Liang, S., Yin, A., & Dang, L. (2019). Fire Resistance Investigation of Simple Supported RC Beams with Varying Reinforcement Configurations. Advances in Civil Engineering, 8625360. https://doi.org/10.1155/2019/8625360.
Wasson, R., Nahid, M., Lattimer, B., & Diller, T. (2016). Influence of a Ceiling on Fire Plume Velocity and Temperature. Fire Technology, 52, 1863–1886. https://doi.org/10.1007/s10694-015-0529-3.
Wickström, U. (2011). The adiabatic surface temperature and the plate thermometer. Fire Safety Science, 10, 1001–11. https://doi.org/10.3801/IAFSS.FSS.10-1001.
Wickström, U., Hunt, S., Lattimer, B., Barnett, J., & Beyler, C. (2018). Technical comment-Ten fundamental principles on defining and expressing thermal exposure as boundary conditions in fire safety engineering. Fire Mater, 42, 985–988. https://doi.org/10.1002/fam.2660.
Wickström, U., Anderson, J., & Sjöström, J. (2019). Measuring incident heat flux and adiabatic surface temperature with plate thermometers in ambient and high temperatures. Fire Mater 43, 51–56. https://doi.org/10.1002/fam.2667.
Xu, Q., Li, G., & Wang, Y. (2021). A simplified method for calculating non-uniform temperature distributions in thin-walled steel members protected by intumescent coatings under localized fires. Thin-Walled Structures, 162, 107580. https://doi.org/10.1016/j.tws.2021.107580.
Zhang, C., Li, G., & Usmani, A. (2013). Simulating the behaviour of restrained steel beams to flame impingement from localized fires. Journal of Constructional Steel Research, 83, 156–65. https://doi.org/10.1016/j.jcsr.2013.02.001.
Zhang, C., Silva, J., Weinschenk, C., Kamikawa, D., & Hasemi, Y. (2016). Simulation Methodology for Coupled Fire-Structure Analysis: Modelling Localized Fire Tests on a Steel Column. Fire Technology, 52, 239–62. https://doi.org/10.1007/s10694-015-0495-9.
Zhang, C., Zhang, Z., & Li, G. (2016). Simple vs. sophisticated fire models to predict performance of SHS column in localized fire. Journal of Constructional Steel Research, 120,62–9. https://doi.org/10.1016/j.jcsr.2015.12.026.
Zhou, J., Zhou, X., Cong, B., & Wang, W. (2023). Comparison of different CFD-FEM coupling methods in advanced structural fire analysis. International Journal of Thermal Sciences, 193, 108465. https://doi.org/10.1016/j.ijthermalsci.2023.108465.