• Tahir AKGÜL Sakarya Üniversitesi Teknoloji Fakültesi, Turkey
  • Arijit Sinha Oregon State University


Arrhenius activation energy, Douglas-fir, kinetics model, regression


Wood to sheathing connections is crucial to lateral force resisting system of the wood-frame structure. Engineers are often faced with the challenge of predicting strength of a partially damaged structure after it has been exposed to elevated temperature during a fire. Numerical simulations to predict the residual strength need thermal degradation data and models for the material as well as the connections. Therefore, it is important to categorize connection response when exposed to elevated temperatures for a sustained period of time. This study addresses this issue by developing models to predict lateral yield strength degradation of wood to Oriented Strandboard (OSB) connection after exposure to elevated temperature. A total of 394 Douglas-fir to OSB connections were tested laterally as a function of 8 different temperatures and 8 exposure times within each temperature regime. Yield strength of the connection decreased as a function of temperature and exposure time. Rate of degradation was higher at higher temperatures. A regression-based statistical model was developed. Additionally, these results were fit to a 2-step simple kinetics model, based on the assumption of degradation kinetics following an Arrhenius activation energy model. The kinetics-based model was preferred over regression model as it fit the data better with one less parameter and predictions consistently matched the observed values for an independent data set.

Author Biographies

Tahir AKGÜL, Sakarya Üniversitesi Teknoloji Fakültesi, Turkey

Department of the Civil Engineering

Currently, Visiting Scientist, Oregon State University

Arijit Sinha, Oregon State University

Assistant Profesor

Dept. of Wood Science and Engineering


AFPA (2005) General dowel equations for calculating lateral connection values. Technical Report 12. American Forest and Paper Association. Washington, D.C.

ANSI/AWC (2015) National design specification® for wood construction. American Wood Council. Washington, D.C.

ASTM (2007a) F 1575 Standard test method for determining bending yield moment of nails. American Society for Testing and Materials, West Conshohocken, PA.

Aune P, Patton-Mallory M (1986b) Lateral load-bearing capacity of nailed joints based on the yield theory: Experimental verification. Research Paper FPL 470. USDA, Forest Serv. Forest Prod. Lab. Madison, WI.

Aune P, Patton-Mallory M (1986a) Lateral load bearing capacity of nailed joints based on the yield theory: Theoretical development. Research Paper FPL 469. USDA, Forest Serv. Forest Prod. Lab. Madison, WI.

Buchanan AH (2002) Structural design for fire safety. John Wiley and Sons, West Sussex, England.

Foschi RO, Bonac T (1977) Load-slip characteristics for connections with common nails. Wood Science, 9(3): 118-123.

Foschi, R.O. (1974). “Load-slip characteristics of nails.” Journal of Wood Science, 7(1), 69-76.

FPL (2010) Wood handbook—Wood as an engineering material. Gen Tech Rep FPL-GTR-190. USDA For Serv Forest Products Laboratory, Madison, WI. 508 pp.

Frangi, A., Schleifer, V., Fontana, M. and Hugi, E. (2010). “Experimental and Numerical Analysis of Gypsum Plasterboards in Fire.” Fire Technology, 46(1), 149-167.

Fuller, J.J. (1990). “Predicting the thermo-mechanical behavior of a gypsum-to-wood nailed connection.” MS Thesis, Oregon State University, Corvallis, OR

Gao, M., Sun, C.Y. & Wang, C.X. (2006). Thermal degradation of wood treated with flame retardants. Journal of Thermal Analysis and Calorimetry, 85(3),765-769.

Kent SM, Leichti RJ, Rosowsky DV, Morrell JJ (2004) Effect of wood decay by Postia Placenta on the lateral capacity of nailed oriented strandboard sheathing and douglas-fir framing members. Wood Fiber Sci. 36(4): 560-572.

Kuenzi EW (1955) Theoretical design of a nailed or bolted joint under lateral load. Rep. No. Dl951. US Dept of Agriculture, Forest Products Laboratory, Madison, WI.

Lebow PK, Winandy JE (1999) Verification of a kinetics-based model for long-term effects of fire retardants on bending strength at elevated temperatures. Wood and Fiber Science 31(1): 49-61.

McLain TE (1975) Curvilinear load-slip relations in laterally loaded nail joints. PhD Thesis, Colorado State University, Fort Collins, Colorado, USA.

Nishiyama N, Ando N (2003) Analysis of load-slip characteristics of nailed wood joints: application of a two-dimensional geometric nonlinear analysis. J. Wood Science (49): 505-512.

Noren J (1996) Load-bearing capacity of nailed joints exposed to fire. Fire Material (20): 133-143.

Pellicane PJ (1991) Application of the European yield model to nailed joints in southern hardwoods. J. Testing Eval 19(5): 385-393.

Peyer SM, Cramer SM (1999) Behavior of nailed connection at elevated temperature. Wood Fiber Sci 31(3): 264-276.

Price EW, Gromala DS (1980) Racking strength of walls sheathed with structural flakeboards made from southern species. Forest Products Journal 30(12): 19-23.

Ramsey FL, Schafer DW (2002) The Statistical Sleuth: A Course in Methods of Data Analysis. Duxbury/Thompson Learning, Pacific Grove, California, USA.

Shrestha D, Cramer S, White R (1995) Simplified models for the properties of dimension lumber and metal- plate connections at elevated temperatures. Forest Products Journal 45(7/8): 35-42.

Sinha A (2013) Thermal Degradation Modeling of Flexural Behavior of Wood after exposure to elevated temperature. Wood Material Science and Engineering 8(2): 111-118.

Sinha A, Avila DG (2014) Lateral load carrying connection properties and withdrawal capacity of hybrid poplar. Wood and Fiber Science 46(1): 97-108.

Sinha A, Gupta R (2009) Strain distribution in OSB and GWB in wood-frame shear walls. Journal of Structural Engineering 135(6): 666-675

Sinha A, Gupta R, Nairn JA (2011a) Thermal Degradation of the bending properties of structural wood and wood-based composites. Holzforschung 65: 221-229.

Sinha A, Gupta R, Nairn JA (2011b) Thermal degradation of lateral yield strength of nailed wood connections. J Mat Civil Engr 23(6): 812-822.

Sinha A, Nairn JA, Gupta R (2011c) Thermal Degradation of the bending strength of plywood and oriented Strand Board: A Kinetics approach. Wood Science and Technology 45: 315-330.

Smith I, Craft ST, Quenneville P (2001) Design capacities of joints with laterally loaded nails. Can. J. Civil Engineering 28: 282-290.

Theilen RD, Bender DA, Pllock DG, Winistorfer SG (1998) Lateral Resistance of ring-shank nail connections in Southern Pine lumber. Trans ASAE 41(2): 465-472.

Winandy JE, Lebow PK (1996) Kinetics models for thermal degradation of strength of fire-retardant treated wood. Wood and Fiber Science 28(1): 39-52.

Winandy JE, Levan SL, Ross RJ, Hoffman SP, McIntyre CR (1991) Thermal degradation of fire-retardant-treated plywood: Development and evaluation of test protocol. Research Paper FPL-RP 501 US Department of Agriculture, Forest Service, Forest Products Laboratory. Madison, WI.

Winandy JE, Levan SL, Schaffer EL, Lee PW (1988) Effect of fire-retardant treatment and redrying on the mechanical properties of Douglas-fir and aspen plywood. Research Paper FPL-RP 485 US Department of Agriculture, Forest Service, Forest Products Laboratory. Madison, WI.

Young SA and Clancy P (2001) Structural modeling of light-timber framed walls in fire. Fire Saf. J. 36: 241–268.






Research Contributions