New Yield Model for Wood Dowel Connections
Publication: Journal of Structural Engineering
Volume 136, Issue 10
Abstract
The current National Design Specification (NDS) for Wood Construction design methods for dowel-type connectors are based on four-yield modes for connections in double shear. These yield modes were formulated for use with steel dowels as fasteners. Hence design with nonferrous fasteners, such as wood pegs, common in timber frame joinery, is not addressed. Wood pegs, while large in diameter, are considerably more flexible than steel dowels of the same size. A fifth failure mode is proposed for use with wood pegs. This new failure mode, called Mode V yielding, which is an effective cross-grain dowel failure, has been observed in physical testing as well as numerical modeling. The objective of this paper is to establish a design procedure for the Mode V yielding of pegs. The procedure is calibrated to the level of performance (reliability) expected from the other yield modes. A regression equation to relate the effective cross-grain yield capacity of pegs to specific gravity is also developed for use with the Mode V design equation. A reliability analysis indicates that the proposed Mode V design equation can be used in conjunction with existing NDS yield equations for design of wood doweled connections.
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References
American Forest and Paper Association (AF&PA). (2005). National design specification (NDS) for wood construction, Washington, D.C.
Armstrong, J. P., Skaar, C., and deZeeuw, C. (1984). “The effect of specific gravity on several mechanical properties of some world woods.” Wood Sci. Technol., 18, 137–146.
ASTM. (2007). Annual book of ASTM standards, Vol. 4.10, West Conshohocken, PA.
Brungraber, R. L. (1985). “Traditional timber joinery: A modern analysis.” Ph.D. thesis, Stanford Univ., Palo Alto, CA.
Bulleit, W. M. (2006). “Reliability of steel doweled wood connections designed to ASCE 16-95.” J. Struct. Eng., 132(3), 441–448.
Bulleit, W. M., Sandberg, L. B., Drewek, M. W., and O’Bryant, T. L. (1999). “Behavior and modeling of wood-pegged timber frames.” J. Struct. Eng., 125(1), 3–9.
Ellingwood, B. R. (1999). “A comparison of general design and load requirements in building codes in Canada, Mexico, and the United States.” Eng. J., 26(2), 67–71.
Erikson, R. G. (2003). “Behavior of traditional timber frame structures subjected to lateral load.” Ph.D. thesis, Univ. of Wyoming, Laramie, WY.
Forest Products Laboratory (FPL). (1999). Wood handbook—FPL-GTR-113, Madison, Wis.
Miller, J. F., and Schmidt, R. J. (2004). “Capacity of pegged mortise and tenon joints.” Research Rep., Univ. of Wyoming, Laramie, WY, ⟨http://wwweng.uwyo.edu/civil/publications/thesis/MillerJoe.pdf⟩ (July 15, 2009).
Reid, E. H. (1997). “Behavior of wood pegs in traditional timber frame connections.” MS thesis, Michigan Technological Univ., Houghton, MI.
Sandberg, L. B., Bulleit, W. M., and Reid, E. H. (2000). “Strength and stiffness of oak pegs in traditional timber-frame joints.” J. Struct. Eng., 126(6), 717–723.
Schmidt, R. J., and Daniels, C. E. (1999). “Design considerations for mortise and tenon connections.” Research Rep., Univ. of Wyoming, Laramie, WY.
Schmidt, R. J., and MacKay, R. B. (1997). “Timber frame tension joinery.” Research Rep., Univ. of Wyoming, Laramie, WY.
Schmidt, R. J., and Miller, J. F. (2009). “Supplemental data analysis and modeling for TFEC 1–07.” Research Rep., Timber Frame Engineering Council, Beckett, MA.
Schmidt, R. J., and Scholl, G. F. (2000). “Load duration and seasoning effects on mortise and tenon joints.” Research Rep., Univ. of Wyoming, Laramie, WY.
Soltis, L. A., and Wilkinson, T. L. (1991). “United States adaptation of European yield model to large-diameter dowel fastener specification.” Proc. 1991 Int. Timber Engineering Conf., Vol. 3, TRADA, London, 3.43–3.49.
Timber Frame Engineering Council (TFEC). (2007). Standard for design of timber frame structures and commentary, Beckett, MA.
Wilkinson, T. L. (1991). “Dowel bearing strength.” Research Paper FPL-RP-505, USDA Forest Service, Forest Products Laboratory, Madison, WI.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 136 • Issue 10 • October 2010
Pages: 1255 - 1261
Copyright
© 2010 ASCE.
History
Received: Aug 4, 2009
Accepted: Mar 28, 2010
Published online: Apr 8, 2010
Published in print: Oct 2010
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