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RE: Re[3]: Expansion Anchors in Masonry

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	Thanks, Rick, for your post.  A little more on this subject- the
seismic criteria for AC 58 (Adhesive Anchors) is complete, and several
manufacturers (including Hilti) have completed testing, and have
supplements removing the seismic restriction from their anchoring
system. (See ICBO report #5193, Evaluation Report Supplement #1.)

	The criteria for AC 1 (mechnical anchors), is not quire
finalized although we are anxiously awaiting the last details so that we
can submit data. 

	Chris Gill
	Hilti, Inc.

> ----------
> From:
> Rick.Drake(--nospam--at)[SMTP:Rick.Drake(--nospam--at)]
> Sent: 	Friday, October 31, 1997 5:25 AM
> To: 	FredT5(--nospam--at); seaoc(--nospam--at)
> Subject: 	Re[3]: Expansion Anchors in Masonry
>      Fred Turner said  <<Some expansion anchors have slipped right out
> of 
>      their holes in past earthquakes. Paying attention to proper 
>      installation procedures is one aspect of the problem, but there
> are 
>      other aspects to some expansion anchor designs that warrant
> testing. 
>      ATC and SEAOSC have recommended two somewhat different cyclic
> testing 
>      protocols, but still very different protocols may be needed to
>      address long, large pulses in near source shaking. Suffice to say
> that 
>      there is not a uniform standard yet for cyclic test protocols. I
> am 
>      glad to see ICBO adopt a go slow approach on approving building 
>      systems such as these which appear to be quite sensitive to
> cyclic     
>      loading. They have learned their lessons from the Northridge
> Earthquake.
>  >>
> _________________________
> I believe that ICBO has developed two Acceptance Criteria (AC)
> documents, 
> AC-1 
> and AC-58, to define dynamic testing for mechanical and adhesive 
> post-installed 
> anchors respectively.  The anchor manufacturers are currently testing
> their 
> product line in accordance with these criteria (At least Hilti is).
> The 
> results
> should be reflected in the next round of ICBO approvals.  This should
> result 
> in 
> the removal of the disclaimers "Use of the anchors in resisting windd
> and 
> seismic forces is beyond the scope of this report." that appeared in
> the 
> reports after the Northridge Earthquake.
> Rick Drake, SE
> Fluor Daniel, Irvine
> ______________________________ Reply Separator 
> _________________________________
> Subject: Re:  Re: Expansion Anchors in Masonry
> Author:  FredT5@aol.com_at_-FDInternet at FDINET
> Date:    10/30/97 4:54 PM
> Fred Turner
> Staff Structural Engineer
> Ca. Seismic Safety Commission
> 1900 K St. #100 Sacramento, CA 95814 
> 916-327-1606 916-322-9476 Fax
> FredT5(--nospam--at)