Estimating the Concomitance of Lumber Strength Properties

Authors

  • Richard A. Johnson
  • William L. Galligan

Keywords:

Proofload, strength properties, correlation, cofunctioning, concomitance

Abstract

Although lumber bending and tensile strength properties have been extensively studied, their co-functioning—so important to the performance of structures—is not well understood. A novel application of proofloading is now available to wood scientists who need to estimate the cofunctioning of two strength properties. This technique and a statistical analysis of the data developed from the proofload experiments are presented.

References

American Society for Testing and Materials. 1970. Standard methods of static tests of timbers in structural sizes. ASTM Stand. Des. D 198-67. Philadelphia. PA.nFreas, A. D., and M. L. Selbo. 1954. Fabrication and design of glued laminated wood structural members. USDA Tech. Bull. No. 1069. Supt. Doc., Gov. Printing Office, Washington, DC.nGalligan, W. L., R. J. Hoyle, R. F. Pellerin, J. H. Haskell, and J. M. Taylor. 1982. Characterizing the properties of 2-inch softwood dimension lumber with regression and stochastic distribution. To be published. For. Prod. Lab., Madison, WI.nGalligan, W. L., R. A. Johnson, and J. R. Taylor. 1980. Examination of the concomitant properties of lumber. Proc. Conf. Performance Metal Plate Wood Truss. For. Prod. Res. Soc, Madison, WI.nJohnson, R. A. 1980. Current statistical methods for estimating lumber properties by proof loading. For. Prod. J.30(1):14-22.nNational Forest Products Association. 1977. National design specification. NFPA, Washington, DC.nRiberholt, H., and P. H. Madsen. 1979. Measured variation of the cross sectional strength of structural lumber. Rep. No. 114. Structural Research Laboratory, Tech. Univ. of Denmark. Copenhagen.nSenft. J. F. 1973. Further studies in combined bending and tension strength of structural 2 by 4 lumber. For. Prod. J.23(10):36-41.nSenft. J. F., and S. K. Suddarth. 1970. Strength of structural lumber under combined bending and tension loading. For. Prod. J.20(7):17-21.nZahn, J. J. 1981. Strength of lumber under combined bending and compression. USDA For. Serv. Res. Pap. FPL 391. For. Prod. Lab., Madison, WI.n

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Published

2007-06-27

Issue

Number 3 / July 1983

Section

Research Contributions

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