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RE:Post-Installed Anchors - again

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Dmitri,

That is fairly huge.  IBC 2009 ain't the law yet here is California, but it makes for useful/interesting stuff to have in your pocket when you're talking to people.

Thanks Very Much,
Mark

--- On Tue, 6/29/10, Dmitri Wright <dmitri(--nospam--at)cascade-structural.com> wrote:

> From: Dmitri Wright <dmitri(--nospam--at)cascade-structural.com>
> Subject: RE:Post-Installed Anchors - again
> To: "Seaint" <seaint(--nospam--at)seaint.org>
> Date: Tuesday, June 29, 2010, 9:40 AM
> Mark,
> 
> Actually, there is a new development on this subject. 
> IBC 2009, Ch 1908.1.9 exempts anchors for nonstructural
> elements from the ductility requirements of ACI D.3.3.4
> & 3.3.5.  Someone finally realized that there was a
> triple penalty on these anchors.  So this effectively
> reduces the safety factor from
> 1.3X2.5X1/0.75X1.4X1/0.65=9.33 to
> 1.3X1/0.75X1.4X1/0.65=3.73
> 
> Dmitri Wright, PE
> Cascade Engineering, Inc.
> 245 SE 4th Ave, Suite B
> Hillsboro, OR  97123-4033
> dmitri(--nospam--at)cascade-structural.com
> 503-846-1131
> 
> 
> 
> 
> From: Mark Johnson <markajohn(--nospam--at)yahoo.com>
> Subject: Post-Installed Anchors - again
> To: seaint(--nospam--at)seaint.org
> 
> I hate to bring this up again, but ....
> 
> If I want to anchor some mechanical and electrical
> equipment to a concrete slab on grade for seismic (SDC E), I
> need to design the anchors for the design force times 1.3
> (ASCE7 - bolts in concrete), 2.5 (ACI App.D for ductility)
> and 1/0.75 (per IBC; Ch. 14.2.2).  In addition, there
> is special inspection.
> 
> Is that all still correct?  Is there any new
> development I'm missing?  (I hope, I hope)
> 
> thanks,
> Mark Johnson
> 
> 
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