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RE: Bow String Truss

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Summerbell, a company that built bowstring trusses in the first half of the 20th century made its trusses with a 30 degree slope at the rising from the support.  By their table, a truss with 120-ft span had a truss height of 17’-3-3/8”, and a camber of 8”.


Nels Roselund, SE

South San Gabriel, CA


From: Rich Lewis [mailto:seaint03(--nospam--at)]
Sent: Wednesday, May 17, 2006 11:33 AM
To: seaint(--nospam--at)
Subject: Bow String Truss


Is there a standard rise to run ratio that most bow string trusses would use?  I can’t find anything regarding this in my text books.  I have a hanger with a 120 ft. clear span.  I eyeball the truss height at 15-16 feet.  It would take rental of a lift to verify it.  I want to check the wind load on the building and would like to find a good approximation of the height.  The truss is fabricated from pipe.


Thanks for any insight you may be able to give.