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Splicing heavy timber truss tension members

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You might check into timber rivets. Here's a link to a recent article in
Structure Magazine about them:

The author would probably be able to advise you as well.



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: Jim Wilson <wilsonengineers(--nospam--at)>
Subject: Splicing heavy timber trusse tension members
To: seaint(--nospam--at)

I need to recommend a heavy duty splice to strengthen the lower chord of a
timber truss. The design tensile force is about 30kips with full snow load.
The existing 12x12 member has a simple 12" long lap splice with one or maybe
two 1" diameter through bolts holding the whole truss together. (Yikes!)
Adding steel splice plates with bolts into the wood will meet the load
criteria, but I am worried about adding so many holes to the existing - (35)
5 1/2" long 5/8"dia lag bolts each side of the splice. Through bolts would
be stronger, but they are more awkward to install because of confinment
issues with the in service condition.
Does anybody have any recommendations from experience with old members like
Jim Wilson, PE
Stroudsburg, PA

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