Improving the Fire Performance of LSF Wall and Floor Systems Using External Insulation
Publication: Journal of Architectural Engineering
Volume 23, Issue 4
Abstract
The load-bearing light-gauge steel-framed (LSF) wall systems used in buildings are protected against fire by attaching fire-resistant gypsum plasterboard layers on both sides. They are also provided with cavity insulation to improve the thermal comfort of buildings during severe hot and cold weather conditions. However, recent research studies have shown that cavity insulation reduces the fire performance of load-bearing LSF walls. Therefore, researchers at the Queensland University of Technology proposed the use of externally insulated LSF walls and floors where insulation is sandwiched between the inner and outer layers of plasterboard instead of being placed inside the cavity. This article reviews and evaluates the results from the small- and full-scale fire tests and numerical studies performed on such externally insulated wall and floor systems exposed to standard and code-prescribed parametric fire curves. Comparison of the fire-resistance ratings and time–temperature profiles of the cavity-insulated and externally insulated wall and floor systems confirmed the superior fire performance of externally insulated load-bearing LSF walls and floors compared with cavity-insulated systems. The reasons for the superior fire performance are discussed in this article. This research also found that placing the plasterboard joints along the studs had minimum detrimental effects on the fire performance of externally insulated LSF wall systems. Overall, this research recommends the use of externally insulated wall and floor systems instead of cavity-insulated systems because of their thermal comfort and superior fire performance. This article includes the details of an efficient LSF wall construction process based on the use of composite panels consisting of two plasterboard layers with insulation sandwiched between them.
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Acknowledgments
The authors thank QUT for providing the full-scale fire testing and high-performance computing facilities and thank QUT and the Australian Research Council for providing the financial support to conduct this research project.
References
ABCB (Australian Building Codes Board). (2015). National construction code (NCC). Building code of Australia, Canberra, Australia.
Alfawakhiri, F., Sultan, M. A., and MacKinnon, D. H. (1999). “Fire resistance of load-bearing steel-stud walls protected with gypsum board: A review.” Fire Technol., 35(4), 308–335.
Ariyanayagam, A. D., Kesawan, S., and Mahendran, M. (2016). “Detrimental effects of plasterboard joints on the fire resistance of light gauge steel frame walls.” Thin Walled Struct., 107, 597–611.
Ariyanayagam, A. D., and Mahendran, M. (2014a). “Development of realistic design fire time-temperature curves for the testing of cold-formed steel wall systems.” Front. Struct. Civ. Eng. J., 8(4), 427–447.
Ariyanayagam, A. D., and Mahendran, M. (2014b). “Experimental study of load-bearing cold-formed steel walls exposed to realistic design fires.” J. Struct. Fire Eng., 5(4), 291–330.
Ariyanayagam, A. D., and Mahendran, M. (2014c). “Numerical modelling of load bearing light gauge steel frame wall systems exposed to realistic design fires.” Thin Walled Struct., 78, 148–170.
Ariyanayagam, A. D., and Mahendran, M. (2015). “Fire design rules for load bearing cold-formed steel frame walls exposed to realistic design fire curves.” Fire Saf. Journal, 77, 1–20.
Baleshan, B., and Mahendran, M. (2016). “Numerical study of high strength LSF floor systems in fire.” Thin Walled Struct., 101, 85–99.
Baleshan, B., and Mahendran, M. (2017). “Experimental study of light gauge steel framing floor systems under fire conditions.” Adv. Struct. Eng., 20(3), 426–445.
CEN (European Committee for Standardization). (2002). “Actions on structures. Part 1-2: General actions—Actions on structures exposed to fire.” EN 1991-1-2, Eurocode 1, Brussels, Belgium.
Chen, W., and Ye, J. (2014). “Fire resistance prediction of load bearing cold-formed steel walls lined with gypsum composite panels.” Proc., 22nd Int. Specialty Conf. on Cold-Formed Steel Structures, Missouri Univ. of Science and Technology, Rolla, MO, 541–555.
Chen, W., Ye, J., Bai, Y., and Zhao, X.-L. (2012). “Full-scale fire experiments on load-bearing cold-formed steel walls lined with different panels.” J. Constr. Steel Res., 79, 242–254.
Chen, W., Ye, J., Bai, Y., and Zhao, X.-L. (2013). “Improved fire resistant performance of load bearing cold-formed steel interior and exterior wall systems.” Thin Walled Struct., 73, 145–157.
Feng, M., and Wang, Y. C. (2005). “An experimental study of loaded full-scale cold-formed thin-walled steel structural panels under fire conditions.” Fire Saf. J., 40(1), 43–63.
Feng, M., Wang, Y. C., and Davies, J. M. (2003). “Thermal performance of cold-formed thin-walled steel panel systems in fire.” Fire Saf. J., 38(4), 365–394.
Gunalan, S., Kolarkar, P., and Mahendran, M. (2013). “Experimental study of load bearing cold-formed steel wall systems under fire conditions.” Thin Walled Struct., 65, 72–92.
Gunalan, S., and Mahendran, M. (2013). “Finite element modelling of load bearing cold-formed steel wall systems under fire conditions.” Eng. Struct., 56, 1007–1027.
ISO. (1999). “Fire resistance tests—Elements of building construction. Part 1: General requirements.” ISO 834-1:1999, Geneva, Switzerland.
Jones, B. H. (2001). “Performance of gypsum plasterboard assemblies exposed to real building fires.” M.S. thesis, Dept. of Civil Engineering, Univ. of Canterbury, Christchurch, New Zealand.
Kankanamge, N. D., and Mahendran, M. (2011). “Mechanical properties of cold-formed steels at elevated temperatures.” Thin Walled Struct., 49(1), 26–44.
Keerthan, P., and Mahendran, M. (2013). “Thermal performance of composite panels under fire conditions using numerical studies: Plasterboards, rockwool, glass fibre and cellulose insulations.” Fire Technol., 49(2), 329–356.
Keerthan, P., and Mahendran, M. (2014). “Thermal performance of load-bearing cold-formed steel walls under fire conditions using numerical studies.” J. Struct. Fire Eng., 5(3), 261–289.
Kesawan, S., Jatheeshan, V., and Mahendran, M. (2015). “Elevated temperature mechanical properties of hollow channel flange sections.” Constr. Build. Mater., 87, 86–99.
Kesawan, S., and Mahendran, M. (2015a). “Fire tests of load-bearing LSF walls made of hollow flange channel sections.” J. Constr. Steel Res., 155, 191–205.
Kesawan, S., and Mahendran, M. (2015b). “Thermal performance of load-bearing walls made of cold-formed hollow flange channel sections in fire.” Fire Mater., 40(5), 704–730.
Kesawan, S., and Mahendran, M. (2016a). “Fire design rules for LSF walls made of hollow flange channel sections.” Thin Walled Struct., 107, 300–314.
Kesawan, S., and Mahendran, M. (2016b). “Predicting the performance of LSF walls made of hollow flange sections in fire.” Thin Walled Struct., 98(Part A), 111–126.
Kodur, V. K. R., and Sultan, M. A. (2006). “Factors influencing fire resistance of load-bearing steel stud walls.” Fire Technol., 42(1), 5–26.
Kolarkar, P. N., and Mahendran, M. (2008). “Thermal performance of plasterboard lined steel stud walls.” Proc. 19th Int. Specialty Conf. on Cold Formed Steel Structures, Missouri Univ. of Science and Technology, Rolla, MO, 517–530.
Kolarkar, P. N., and Mahendran, M. (2014). “Experimental studies of gypsum plasterboards and composite panels under fire conditions.” Fire Mater., 38(1), 13–35.
Lennon, T., and Moore, D. (2003). “The natural fire safety concept—Full-scale tests at Cardington.” Fire Saf. J., 38(7), 623–643.
SA (Standards Australia). (2005). “Methods for fire tests on building materials, components and structures, fire-resistance tests of elements of building construction.” AS 1530.4–2005,North Sydney, NSW, Australia.
Shahbazian, A., and Wang, Y. C. (2013). “A simplified approach for calculating temperatures in axially loaded cold-formed thin-walled steel studs in wall panel assemblies exposed to fire from one side.” Thin Walled Struct., 64, 60–72.
Zhao, B., et al. (2005). “Calculation rules of lightweight steel sections in fire situations.” Technical steel research, European Commission, Brussels, Belgium.
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© 2017 American Society of Civil Engineers.
History
Received: Sep 26, 2016
Accepted: May 2, 2017
Published online: Aug 24, 2017
Published in print: Dec 1, 2017
Discussion open until: Jan 24, 2018
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