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Re: ACI 318 Appendix D

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IIRC, the Boston case was that of an installation defect. You cannot make anything fool proof, just because fools are so ingenious. 
I asked HILTI and SST specialists, they could not come up with any one case of failure.
And these factors - 2.5 or 1.3, on top of 1.33 (0.75) for our conditions, and on top of all other CYA factors - are plainly outrageous.
V. Steve Gordin, SE
Irvine CA
----- Original Message -----
Sent: Thursday, April 16, 2009 14:36
Subject: RE: ACI 318 Appendix D

I would not go so far as to say 100% absence of failures, the Boston tunnel comes to mind, but I agree wholeheartedly that the Appendix D provisions are overly conservative and not very realistic.  I guess we just have to stop applying anything that is post-installed, like that's a realistic choice.
Paul Feather PE, SE

From: SGE Structural [mailto:sgordin(--nospam--at)]
Sent: Thursday, April 16, 2009 2:31 PM
To: seaint(--nospam--at)
Subject: Re: ACI 318 Appendix D

Assuming concrete is cracked, you are absolutely correct.
All this happens on the background of the 100% absence of any reported failures.
What a joke.
V. Steve Gordin, SE
Irvine CA
----- Original Message -----
From: Bill Allen
To: Seaint
Sent: Thursday, April 16, 2009 13:25
Subject: ACI 318 Appendix D

O.K., I've beaten my head against the wall long enough. I've decided that a post-installed anchor won't work in tension for anything I design.


I feel better now.



T. William (Bill) Allen, S.E.


Consulting Structural Engineers
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