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[SEAOC] Re: [SEAOC] simpson strength values[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: [SEAOC] Re: [SEAOC] simpson strength values
- From: TFHSE(--nospam--at)aol.com
- Date: Fri, 28 Jun 1996 11:34:40 -0400
Note that Simpson Hold-Down values require the engineer to check net section of the timber post. If you include the eccentricity between anchor bolt and cl of post, design values can be significantly less than the Simpson catalog. The post experiences combined tensile and bending stresses at the bolt hole net section which can severely limit the capacity. It's hard to get a 4x4 to figure for more than about 2300 lbs tension, irrespective of wether you attach a HD-2A or HD-15. The plywood and edge nailing may resist some of the eccentric moment. It's probably not a real problem for hold down forces under say 5 to 7 kips. However for large forces, you may want to eliminate the eccentricity by: using a U strap; or 2 HD's, one on each side of the post; or use a threaded rod system. Thomas F. Heausler, S.E. Kansas City ...
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