TECHNICAL PAPERS
Sep 1, 1986

Design of Wood Members Under Combined Load

Publication: Journal of Structural Engineering
Volume 112, Issue 9

Abstract

A new design criterion for wood members under combined axial and bending loads is proposed. The new equation covers biaxial bending, axial load, and water ponding. It employs Ylinen's column formula for beam or column buckling, and replaces the linear interaction equation with more accurate equations based on recent test data and results of elastic stability analysis. Despite its simplicity, the proposed criterion is more general, more rational and more accurate than the existing design criterion.

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References

1.
Buchanan, A. H., “Strength Model and Design Methods for Bending and Axial Load Interaction in Timber Members,” thesis presented to the University of British Columbia, at Vancouver, B.C., Canada, in 1984, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
2.
Galambos, T. V., “Beam‐Columns,” Structural Members and Frames, Prentice‐Hall, Inc., Englewood Cliffs, N.J., 1968, pp. 246–249.
3.
Johns, K. C., and Buchanan, A. H., “Strength of Timber Members in Combined Bending and Axial Loading,” Proceedings of the International Union of Forestry Research Organizations, Wood Engineering Group S5.02, May, 1982, pp. 343–368.
4.
Malhotra, S. K., “Analysis and Design of Timber Beam‐Columns,” Preprint 3621, ASCE Annual Convention, Atlanta, Ga., Oct. 23–25, 1979.
5.
Malhotra, S. K., “Buckling Strength of Solid Timber Columns,” thesis presented to Nova Scotia Technical College, at Halifax, N.S., Canada, in 1969, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
6.
Malhotra, S. K., “A Rational Approach to the Design of Solid Timber Columns,” Applications of Solid Mechanics, Study No. 7, Univ. of Waterloo, Waterloo, Ontario, Canada, 1972.
7.
National Forest Products Association, “National Design Specification for Wood Construction,” NFPA, Washington, D.C., 1982.
8.
Neubauer, L. W., “Full‐Size Stud Tests Confirm Superior Strength of Squareend Columns,” Transactions of the American Society of Agricultural Engineers, Vol. 15, No. 2, 1972, pp. 346–349.
9.
Neubauer, L. W., “Proposed CRG Generalized Column Formula for Studs and Poles,” Transactions of the American Society of Agricultural Engineers, Vol. 12, No. 5, 1969, pp. 624–630.
10.
Newliri, J. A., and Gahagan, J. M., “Test of Large Timber Columns and Presentation of the Forest Products Laboratory Column Formula,” Technical Bulletin No. 167, Forest Products Laboratory, U.S. Department of Agriculture, Washington, D.C., 1930.
11.
Newlin, J. A., and Trayer, G. W., “Stresses in Wood Members Subjected to Combined Column and Beam Action,” Forest Products Laboratory Report No. 1311, Madison, Wis., 1941.
12.
Ylinen, A., “A Method of Determining the Buckling Stress and the Required Cross‐sectional Area for Centrally Loaded Straight Columns in Elastic and Inelastic Range,” Publications of the International Association for Bridge and Structural Engineering, Vol. 16, 1956, Zurich, Switzerland, pp. 529–550.
13.
Zahn, J. J., “A Combined‐Load Stability Criterion for Elastic Beam‐Columns.”
14.
Zahn, J. J., “Strength of Lumber Under Combined Bending and Compression,” Research Paper FPL 391, Forest Products Laboratory, U.S. Department of Agriculture, Madison, Wis., 1982.
15.
Zahn, J. J., “Strength of Southern Pine 2×4 Beam‐Columns,” National Technical Information Service, 1984.

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Go to Journal of Structural Engineering
Journal of Structural Engineering
Volume 112Issue 9September 1986
Pages: 2109 - 2126

History

Published online: Sep 1, 1986
Published in print: Sep 1986

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Authors

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John J. Zahn, M. ASCE
Research General Engr., U.S. Dept. of Agr., Forest Serv., Forest Products Lab., 1 Gifford Pinchot Dr., Madison, WI 53705‐2398

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