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RE: ACI 318 Appendix D

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Through-bolts with bearing plate at footing bottom and embedded anchors in footing are different in the way that through-bolts are externally applied load from the underside of the footing and cast-in- anchors are internally exerting forces inside the concrete footing. 

For example the transfer of load from a steel column base plate on top of an elevated concrete slab I don’t believe we need to go through Appendix D to justify that the connection is ok as long as punch shear is checked and ok.  Also if a heavy chandelier is supported by a tension rod through this elevated concrete slab with a bearing plate secured on the top of this slab, I don’t believe we need to justify the connection with Appendix D.

So I don’t think it is a loophole in the code, basically only the eight types of embedded anchors indicated in Appendix D are included.

 

From: SGE Structural [mailto:sgordin(--nospam--at)sgeconsulting.com]
Sent: Thursday, April 16, 2009 3:05 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: ACI 318 Appendix D

 

We start resembling lawyers looking for loopholes.  >From the structural standpoint, the thru bolts in pullout are essentially the same thing as the cast-in bolts.  

So, I will not be surprised to see them included in the next edition or some errata.

 

V. Steve Gordin, SE
Irvine CA

    

----- Original Message -----

Sent: Thursday, April 16, 2009 14:08

Subject: RE: ACI 318 Appendix D

 

In our office, we through-bolt all our concrete anchors and avoid Appendix D entirely.

 

One engineer in our office has a detail where he attaches the heads of his anchor bolts to chains which are in turn fastened to large chunks of Iron dropped in the bottom of the concrete pour, all to avoid Appendix D.

 

"We don't need no stinkin' Appendix D".

 


From: Bill Allen [mailto:t.w.allen(--nospam--at)cox.net]
Sent: Thursday, April 16, 2009 1:26 PM
To: Seaint
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.

ALLEN DESIGNS

Consulting Structural Engineers
 
V (949) 248-8588 F(949) 209-2509