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Re: Moments in wood structures[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Moments in wood structures
- From: BCainse(--nospam--at)aol.com
- Date: Tue, 9 May 2006 00:54:41 EDT
I see the bolted type of post bases often used in this area for 6' high fences in spite of Simpson's cautions. They usually start leaning pretty quickly.
One observation I've made is that the bolt holes are usually over drilled causing a sloppiness in the connection (since the distance between the bolt holes is only 3" and the distance from center of rotation (halfway between the bolt holes) and the top of the post is about 7.5', the deflection at the top of an 8 foot post with a hole 1/16" over the bolt size would be plus or minus 3.7 inches under little if any load (ignoring the initial friction from tightening the bolts which goes away with shrinkage). The holes are usually over drilled by more than 1/16" making it even worse). That would probably not set well with the homeowner.
The CBQ type would be less sloppy since there is no oversize to the SDS screw holes but it would probably be difficult to get them to figure either.
In a message dated 5/8/2006 4:10:10 P.M. Pacific Daylight Time, njineer(--nospam--at)att.net writes:
Bill Cain, S.E.
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