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Re: Basic Anchorage Capacity

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To All,

As long as we are on this subject, the ACI requires an amplifcation factor 
of 2.5 for anchors designed for seismic forces, (as probably everyone knows), 
 unless it can be shown that the anchor is ductile, (see definition on page 
 418 of ACI 318-11). To meet this requirement I have heard of engineers using 
 a smaller diameter anchor bolt in, say, a Simpson HDU product, but this 
just seems counter-intuitive.

Any thoughts on this or other iedeas of avoiding having to amplify the anchor 
 forces by 2.5?

Larry Hauer, S.E.

-----Original Message-----
> From: "Polhemus, William" <wpolhemus(--nospam--at)>
> Sent: Jul 9, 2014 2:54 PM
> To: seaint-seaosc(--nospam--at)
> Subject: Re: [SEAINT-SEAOSC] Basic Anchorage Capacity
> JJ, as long as that's the Building Code that applies to your jurisdiction 
> I don't see why you couldn't.
> However, my opinion (which you didn't solicit): I'd use Profis or Simpson
> Strong-Tie Anchor Designer. They're free, they allow you to have control
> over many of the various conditions you might encounter (for which the IBC 
> chart might not be appropriate) and they also handle post-installed anchors 
> which most of us run into frequently enough.
> As you are still in the Neolithic (😜), I see that Simpson has an ASD
> version and I believe Profis does too.

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