Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (1.71 MB bytes)

Title: Super-strength beams laminated from rotary-cut southern pine veneer

Author: Koch, Peter;

Date: 1966

Source: Forest Products Journal Vol. 17(6): 42-48

Publication Series: Miscellaneous Publication


Very strong beams were made by arranging 42 laminae of 1/6-inch rotary-cut southern pine veneer so that the stiffest veneers were on the tension and compression flanges and the most limber in the center. Beams thus fabricated to a 3-inch width and a 100-inch length averaged 13,280 p.s.i. stress in the outer laminae when failed in flexure. Modulus of elasticity averaged 2,330,000 p.s.i.

Similarly arranged beams were further strengthened by having the outer 6 veneers on both tension and compression sides impregnated with polymethylmethacrylate and then irradiated. These beams withstood 15,030 p.s.i. stress and had an MOE of 2,570,000.

When laminae were arranged by stiffness, but not densified or impregnated, 2-inch-wide beams were stronger per inch of width than 3-inch beams; they also were less variable. The reason probably is that the narrowness of the laminae increases the probability of finding very strong pieces. There appear to be possibilities in assembling wide beams from narrow beams of 2 inches or some other standard width. Further tests of these narrow beams might justify an allowable stress of 4,000 p.s.i.

Ultimate horizontal shear stress (transformed seciton) of the stiffness-arranged beams averaged in excess of 550 p.s.i. While this is a very respectable value for wood beams, it does become a design limitation on these exceptionally strong stiff beams.

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • You may send email to to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)



Koch, Peter 1966. Super-strength beams laminated from rotary-cut southern pine veneer. Forest Products Journal Vol. 17(6): 42-48


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.