Numerical modeling of external light gauge steel framed wall systems exposed to bushfire flame zone conditions

Abstract

Bushfire-related building losses cause adverse economic impacts to countries prone to bushfires. Building materials and components play a vital role in reducing these impacts. However, due to high costs of experimental studies and lack of numerical studies, the heat transfer behavior of building’s external components in bushfire-prone areas has not been adequately investigated. Often large-scale heat transfer models are developed using Computational Fluid Dynamics (CFD) tools, and the availability of CFD models for heat transfer in building components improves the understanding of the behavior of systems and systems of systems. Therefore, this paper uses a numerical modeling approach to investigate the bushfire/wildfire resistance of external Light gauge Steel Framed (LSF) wall systems. Both full-scale and small-scale heat transfer models were developed for the LSF wall systems. Experimental results of six internal and external LSF wall systems with varying plasterboard thickness and cladding material were used to validate the developed models. The study was then extended to investigate the bushfire resistance of seven external wall systems under two different bushfire flame zone conditions. The results illustrate the significant effects of fire curves, LSF wall components and configuration on the heat transfer across the walls. They have shown 1) the favorable performance of steel cladding and Autoclaved Aerated Concrete (AAC) panels when used on the external side of wall systems and 2) the adequacy of thin-walled steel studs’ load-bearing capacity during bushfire exposures. This study has shown that most of the investigated external LSF walls could be reused with cost-effective retrofitting such as replacing the Fire Side (FS) steel cladding after bushfire exposures. Overall, this study has advanced the understanding of the behavior of external light steel framed walls under bushfire flame zone conditions.

Graphical abstract

Keywords

bushfires / flame zone / external light gauge steel framed walls / heat transfer analyses / numerical models

References

[1] Buechi H, Weber P, Heard S, Cameron D, Plantinga A J. Long-term trends in wildfire damages in California. International Journal of Wildland Fire, 2021, 30(10): 757–762

[2] StandardsAustralia Limited. Methods for Fire Tests on Building Materials, Components and Structures, Part 8.2: Tests on Elements of Construction for Buildings Exposed to Simulated Bushfire Attack––Large Flaming Sources. Sydney: Standards Australia Ltd., 2018

[3] StandardsAustralia Limited. Construction of Buildings in Bushfire-Prone Areas. Sydney: Standards Australia Ltd., 2018

[4] NFPA1144. Standard for Reducing Structure Ignition Hazards from Wildland Fire. Quincy, MA: NFPA, 2013

[5] IWUIC 2018. International Wildland Urban Interface Code. Washington, D.C.: International Code Council, 2018

[6] Jessop D, Abu A, Wade C, Spearpoint M, Gerlich H. Performance of a light timber-framed compartment in natural fire subjected to lateral load. Fire and Materials, 2019, 43(2): 175–188

[7] Jiang J, Lu Y, Dai X, Li G Q, Chen W, Ye J. Disproportionate collapse of steel-framed gravity buildings under travelling fires. Engineering Structures, 2021, 245: 112799

[8] Zhan Q, Xiao Y, Musso F, Zhang L. Assessing the hygrothermal performance of typical lightweight steel-framed wall assemblies in hot-humid climate regions by monitoring and numerical analysis. Building and Environment, 2021, 188: 107512

[9] Ariyanayagam A D, Mahendran M. Numerical modelling of load bearing light gauge steel frame wall systems exposed to realistic design fires. Thin-walled Structures, 2014, 78: 148–170

[10] Ariyanayagam A D, Mahendran M. Experimental study of non-load bearing light gauge steel framed walls in fire. Journal of Constructional Steel Research, 2018, 145: 529–551

[11] Kesawan S, Mahendran M. A review of parameters influencing the fire performance of light gauge steel frame walls. Fire Technology, 2018, 54(1): 3–35

[12] Gnanachelvam S, Ariyanayagam A, Mahendran M. Fire resistance of LSF wall systems lined with different wallboards including bio-pcm mat. Journal of Building Engineering, 2020, 32: 101628

[13] Tao Y, Mahendran M, Ariyanayagam A. Fire tests of cold-formed steel walls made of hollow section studs. Journal of Constructional Steel Research, 2021, 178: 106495

[14] XuQHofmeyerHMaljaarsJvan HerpenR A. Thermomechanical modelling of sandwich panels with connections in fire resistance tests. In: Proceedings of the SiF 2022––The 12th International Conference on Structures in Fire. Hong Kong, China: PolyU, 2022, 703–714

[15] de Boer J, Hofmeyer H, Maljaars J, Van Herpen R. Two-way coupled CFD fire and thermomechanical FE analyses of a self-supporting sandwich panel facade system. Fire Safety Journal, 2019, 105: 154–168

[16] Pancheti J, Mahendran M. Fire resistance of external light gauge steel framed walls clad with autoclaved aerated concrete panels. Thin-walled Structures, 2021, 167: 108201

[17] Hendawitharana S, Ariyanayagam A, Mahendran M, Steau E. Bushfire resistance of external light steel wall systems lined with fibre cement boards. Fire Safety Journal, 2023, 139: 103806

[18] Pancheti J, Mahendran M, Steau E. Fire resistance of external LSF walls with corrugated steel cladding. Journal of Constructional Steel Research, 2022, 188: 107008

[19] Pancheti J, Mahendran M. Fire resistance of external light gauge steel framed walls with brick veneer cladding. Thin-walled Structures, 2023, 182: 110162

[20] Hendawitharana S, Ariyanayagam A, Mahendran M, Steau E. Evaluating the bushfire resistance of a safe room using full-scale experiments. Structures, 2023, 49: 995–1015

[21] Ariyanayagam A D, Mahendran M. Influence of cavity insulation on the fire resistance of light gauge steel framed walls. Construction & Building Materials, 2019, 203: 687–710

[22] Rusthi M, Keerthan P, Mahendran M, Ariyanayagam A. Investigating the fire performance of LSF wall systems using finite element analyses. Journal of Structural Fire Engineering, 2017, 8(4): 354–376

[23] Peiris M, Mahendran M. Advanced numerical modelling of light-gauge steel framed walls subject to eccentric compression. Engineering Structures, 2022, 256: 114063

[24] MaCLuHLiRQuM. One-dimensional finite difference model and numerical simulation for heat transfer of wall in chinese solar greenhouse. Transactions of the Chinese Society of Agricultural Engineering, 2010, 26(6): 231–237 (in Chinese)

[25] MagarabooshanamHAriyanayagamA DMahendranM. Numerical study of double stud LSF walls exposed to fire conditions. In: Proceedings of Cold-Formed Steel Research Consortium Colloquium 2020. Baltimore, MD: JScholarship, 2020

[26] Hadjisophocleous G, Jia Q. Comparison of FDS prediction of smoke movement in a 10-storey building with experimental data. Fire Technology, 2009, 45(2): 163–177

[27] Lázaro D, Puente E, Lázaro M, Lázaro P G, Peña J. Thermal modelling of gypsum plasterboard assemblies exposed to standard fire tests. Fire and Materials, 2016, 40(4): 568–585

[28] Nguyen Q, Ngo T, Tran P, Mendis P, Aye L, Baduge S K. Fire resistance of a prefabricated bushfire bunker using aerated concrete panels. Construction & Building Materials, 2018, 174: 410–420

[29] Zhou J, Zhou X, Cong B, Wang W. Comparison of different CFD-FEM coupling methods in advanced structural fire analysis. International Journal of Thermal Sciences, 2023, 193: 108465

[30] Zhou J, Zhou X, Cong B, Wang W. Numerical study of the convective heat transfer coefficient for steel column surrounded by localized fires. Fire Safety Journal, 2023, 141: 103987

[31] Zhou J, Zhou X, Cong B, Wang W, Gu M. Simulation of steel beam under ceiling jet based on a wind−fire−structure coupling model. Frontiers of Structural and Civil Engineering, 2023, 17(1): 78–98

[32] Glasa J, Valasek L, Weisenpacher P, Halada L. Cinema fire modelling by FDS. Journal of Physics: Conference Series, 2013, 410: 012013

[33] Cicione A, Beshir M, Walls R, Rush D. Full-scale informal settlement dwelling fire experiments and development of numerical models. Fire Technology, 2020, 56(2): 639–672

[34] Hendawitharana S, Ariyanayagam A, Mahendran M, Gonzalez F. Lidar-based computational fluid dynamics heat transfer models for bushfire conditions. International Journal of Disaster Risk Reduction, 2021, 66: 102587

[35] AustralianBuilding Codes Board (ABCB). Bushfire Verification Method Handbook. Canberra: ABCB, 2019

[36] McGrattanKHostikkaSFloydJMcDermottRVanellaMMuellerE. Fire Dynamics Simulator-Technical Reference Guide. Gaithersburg, MD: NIST Special Publication, 2023, 1018–1

[37] Kuzyk A, Skorobagatko T, Yemelyanenko S, Borys O, Dobrostan O. Computer simulation of fire test parameters façade heat insulating system for fire spread in fire dynamics simulator (FDS). Series of Geology and Technical Sciences, 2020, 4(442): 35–44

[38] BlakePPhylaktouHAndrewsG. Validating FDS against a full-scale fire test. In: Proceedings of 2018 Fire and Evacuation Modeling Technical Conference. Gaithersburg, MD: FEMTC, 2018

[39] Li Q, Zhang C, Li G Q. Symmetric modeling of the thermal actions in a structural fire experiment on a long-span composite floor beam in a compartment. Fire Safety Journal, 2021, 120: 103079

[40] HowellJ RMengücM PDaunKSiegelR. Thermal Radiation Heat Transfer. Boca Raton, FL: CRC Press, 2020

[41] McGrattanKMcDermottRVanellaMHostikkaSFloydJ. Fire Dynamics Simulator Technical Reference Guide Volume: 2 Verification. Gaithersburg, MD: NIST Special Publication, 2021, 1018–2

[42] Zehfuß J, Sander L. Gypsum plasterboards under natural fire—Experimental investigations of thermal properties. Civil Engineering Design, 2021, 3(3): 62–72

[43] AriyanayagamAMahendranM. Thermal Finite Element Analysis of Peer Stud Walls Lined with Gypsum Plasterboards––Part 1. Brisbane: Queensland University of Technology, 2016

[44] Jatheeshan V, Mahendran M. Experimental study of cold-formed steel floors made of hollow flange channel section joists under fire conditions. Journal of Structural Engineering, 2016, 142(2): 1409

[45] TaoYMahendranMAriyanayagamA. Load-bearing walls made of cold-formed steel hollow section studs exposed to fire. In: Proceedings of 9th International Conference on Steel and Aluminium Structures: ICSAS19. London: Independent Publishing Network, 2019, 1533–1544

[46] PanchetiJ. Fire Resistance of external light gauge steel framed wall systems. Dissertation for the Doctoral Degree. Brisbane: Queensland University of Technology, 2022

[47] GnanachelvamS. Fire and energy performance of cold-formed steel frame wall systems. Dissertation for the Doctoral Degree. Brisbane: Queensland University of Technology, 2020

[48] McGrattanKMcDermottRVanellaMHostikkaSFloydJ. Fire Dynamics Simulator Technical Reference Guide Volume: 3 Validation. Gaithersburg, MD: NIST Special Publication, 2021, 1018–3

[49] Kolaitis D I, Founti M A. Development of a solid reaction kinetics gypsum dehydration model appropriate for CFD simulation of gypsum plasterboard wall assemblies exposed to fire. Fire Safety Journal, 2013, 58: 151–159

[50] Wakili K G, Hugi E, Karvonen L, Schnewlin P, Winnefeld F. Thermal behaviour of autoclaved aerated concrete exposed to fire. Cement and Concrete Composites, 2015, 62: 52–58

[51] Ariyanayagam A, Mahendran M. Fire performance of load bearing LSF wall systems made of low strength steel studs. Thin-walled Structures, 2018, 130: 487–504

[52] Ariyanayagam A, Mahendran M. Residual capacity of fire exposed light gauge steel frame walls. Thin-walled Structures, 2018, 124: 107–120

[53] Kankanamge N, Mahendran M. Mechanical properties of cold-formed steels at elevated temperatures. Thin-walled Structures, 2011, 49(1): 26–44

[54] Gnanachelvam S, Ariyanayagam A, Mahendran M. Effects of insulation materials and their location on the fire resistance of LSF walls. Journal of Building Engineering, 2021, 44: 103323

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