Localized Tensile Strength and Modulus of Elasticity of E-Related Laminating Grades of Lumber

Authors

  • Brent A. Richburg
  • Donald A. Bender

Keywords:

MOE (modulus of elasticity), tensile strength, lumber, glulam, simulation, reliability

Abstract

Localized modulus of elasticity (MOE) and tensile strength (T) of six E-rated grades and two visual grades of 2 by 6 Douglas-fir laminating lumber were measured over a test span of 2 ft. The E-rated laminating grades studied were C14, 2.3E-1/6, 2.3E-1/3, 2.0E-1/6, 2.0E-1/3, and 1.7E-1/4. The visual laminating grades were L2 and L3, which consisted of lumber not qualifying for the E-rated grades. Multivariate statistical parameters and probability distributions were fit to the localized MOE and T data. These parameters can be used to simulate lumber properties needed to predict the reliability of glued-laminated timber beams. Localized MOE and T data were simulated using a multivariate approach to determine whether the statistical properties of the original MOE and T data were preserved in the simulated data. The original statistical properties (i.e., probability distributions and correlations) were preserved in the simulated data for all lumber grades studied.

References

American Institute of Timber Construction (AITC). 1984. Lumber grading for glued-laminated timber. Inspection Bureau Memorandum No. 3. AITC, Vancouver, WA.nAmerican Institute of Timber Construction (AITC). 1988. Manufacturing—Standard specifications for structural glued-laminated timber of softwood species. AITC 117-88. AITC, Vancouver, WA.nAmerican Society for Testing and Materials (ASTM). 1990a. Static tests of timber in structural sizes. ASTM standard D198-84. ASTM, Philadelphia, PA.nAmerican Society for Testing and Materials (ASTM). 1990b. Standard test methods for mechanical properties of lumber and wood-based structural material. ASTM standard D4761-88. ASTM, Philadelphia, PA.nEhlbeck, J., F. Colling, and R. Gorlacher. 1985a. Influence of finger-jointed lamellae on the bending strength of glulam beams: Development of a computer model. Holz Roh Werkst. 43(8):333-337.nEhlbeck, J., F. Colling, and R. Gorlacher. 1985b. Influence of finger-jointed lamellae on the bending strength of glulam beams: Input data for the computer model. Holz Roh Werkst. 43(9):369-373.nFoschi, R. O., and J. D. Barrett. 1980. Glued-laminated beam strength: A model. J. Struc. Div. ASCE 106(ST8):1735-1754.nHan, M. B., D. A. Bender, and S. E. Taylor. 1991. Computer generation of highly-skewed correlated random variables. Transactions of the ASAE 34(5):2279-2281.nHernandez, R., D. A. Bender, B. A. Richburg, and K. S. Kline. 1991. Probabilistic modeling of glued-laminated timber beams. Wood Fiber Sci (in press).nHooper, J. A., and D. A. Bender. 1988. Modeling finger joint tensile strength and MOE for E-rated laminating lumber. ASAE Technical Paper No. 88-4514. American Society of Agricultural Engineers, St. Joseph, MI.nLam, F., and E. Varoglu. 1990. Effect of length on the tensile strength of lumber. Forest Prod. J. 40(5):37-42.nRichburg, B. A. 1989. Modeling localized properties of E-rated laminating lumber. M.S. thesis, Department of Agricultural Engineering, Texas A&M University, College Station, TX.nShowalter, K. L., F. E. Woeste, and B. A. Bendtsen. 1987. Effect of length on tensile strength in structural lumber. USDA Forest Service Research Paper FPL-482. U.S. Forest Products Laboratory, Madison, WI.nTaylor, S. E. 1988. Modeling spatial variability of localized lumber properties. Ph.D. dissertation, Agricultural Engineering Department, Texas A&M University, College Station, TX.nTaylor, S. E., and D. A. Bender. 1991. Stochastic model for localized tensile strength and modulus of elasticity properties in lumber. Wood Fiber Sci. 23(4):501-519.nTaylor, S. E., D. A. Bender., D. E. Kline, and K. S. Kline. 1992. Comparing length effect models for lumber tensile strength. Forest Prod. J. 42(2):23-30.nZhao, W., and F. E. Woeste. 1991. Influence of correlation on tensile strength prediction of lumber. Forest Prod. J. 41(2)45-48.n

Downloads

Published

2007-06-28

Issue

Number 2 / April 1992

Section

Research Contributions

License

The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:

1. All proprietary rights other than copyright, such as patent rights.

2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.

3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.