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RE: GL beam strengthening

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I believe the truss industry is looking at this wrt built-up truss girder
design. TPI or WTCA might have more info on that. IIRC, load sharing is
proportional to stiffness, but I don't think it's been quantified yet.

Also, there is an ASTM standard, D6555 Guideline for Evaluating System
Effects in Repetitive-Member Wood Assemblies, which defines the individual
effects responsible for enhanced repetitive-member performance and provides
general information on the variables that should be considered in the
evaluation of the magnitude of such performance.



John "Buddy" Showalter, P.E. 
Director, Technical Media 
AF&PA/American Wood Council 
1111 19th Street, NW, Suite 800 
Washington, DC 20036 
P: 202-463-2769 
F: 202-463-2791 

The American Wood Council (AWC) is the wood products division of the
American Forest & Paper Association (AF&PA). AWC develops internationally
recognized standards for wood design and construction. Its efforts with
building codes and standards, engineering and research, and technology
transfer ensure proper application for engineered and traditional wood

The guidance provided herein is not a formal interpretation of any AF&PA
standard.  Interpretations of AF&PA standards are only available through a
formal process outlined in AF&PA's standards development procedures.


From: "Bill Allen" <T.W.Allen(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: RE: GL beam strengthening
Buddy -
Are you familiar with any testing which demonstrates that the load is =
proportional to the relative stiffnesses of the original beam and new,
sistered beam(s) which may be a different grade, species, etc. and may =
may not run to the same supports as the original beam?
T. William (Bill) Allen, S.E.
Consulting Structural Engineers

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