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[SEAOC] Re: [SEAOC] Re: [SEAOC] RE: [SEAOC] simpson strength values[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: [SEAOC] Re: [SEAOC] Re: [SEAOC] RE: [SEAOC] simpson strength values
- From: BCASE1356(--nospam--at)aol.com
- Date: Sat, 29 Jun 1996 01:55:24 -0400
Sandy, In response to your question about holdowns being mounted several inches above the sill plate on the post, eventhough Simpson designs the holdown to be flush mounted on the sill plate. The primary reason for this is to help remove some of the slip potential which could occur if the bolt holes are oversized in the post. When the nut is tightened down on the anchor bolt cast in the the concrete foundation, this pulls the holdown downward which helps to set the holdown bolts in the post it they happen to be in oversized holes. If the holdown is mounted directly to the sill plate in oversized holes, then the post will slip before the holdown engages. Also, there is no way to tell if the post holes are oversized once the holdown is installed and washer plates are used on the backside of the post unless you observe the hole size before the holdown is installed. I do not see why the holdown deflection would be any greater because the holdown is raised off of the sill plate instead of being installed bearing directly on the sill plate . The bottom plate of the holdown still wants to bend about the anchor bolt head as you pull up on the holdown assembly. Does the holdown bearing on the sill plate help prevent rotation of this bottom plate underneath the anchor bolt head? Michael Cochran Brian L. Cochran Associates Los Angeles, CA ...
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