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Re: Reinforcing for Anchor Bolt Breakout

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Careful, Scott's going to give you a severe tongue lashing if you start another round of ACI bashing again. 

Which reminds me, how come getting annual updates of the MCP on CD ROM are nearly the full price of the annual cost? Does it really change so much in a year that $385* for one year or $900* for three years (paid in advance) seems like bargain? I mean, they're going to publish it anyway, right? And a CD costs less than a's not like I'm asking for a 20lb delivery of dead tree. Besides, most of the content is just "fixing" what they were wrong about in the last publication, right? (I mean, if they'd done the research properly in the first place, they wouldn't need to fix it, would they.)**

*member price. I joined for this year so I could replenish my 10 year old ACI standards. Seems like there should be some super-secret membership co-op for those of us with small offices who do "everything" just so we can afford all the paper, and CD-ROMS, we need to function.

**I'm kidding. They can charge anything they want. Its a free market.***

***I'm still kidding.

Joe Grill wrote:

And for the low low price of $265.00.


Joseph R. Grill, P.E. (Structural)

Shephard - Wesnitzer, Inc.

Civil Engineering and Surveying

P.O. Box 3924

Sedona, AZ  86340

PHONE (928) 282-1061

FAX (928) 282-2058



-----Original Message-----
From: Smith, Edgar [mailto:eesmith(--nospam--at)]
Sent: Thursday, April 20, 2006 9:20 AM
To: seaint(--nospam--at)
Subject: RE: Reinforcing for Anchor Bolt Breakout


The "PIP STE05121 Anchor Bolt Design Guide" uses hairpins or additional straight rebar next to the anchor bolts to do this.  PIP stands for Process Industry Practices.  The guide is based on App D 318-02.


From: Haan, Scott M POA [mailto:Scott.M.Haan(--nospam--at)]
Sent: Wednesday, April 19, 2006 6:15 PM
To: seaint(--nospam--at)
Subject: RE: Reinforcing for Anchor Bolt Breakout

I thought ACI appendix D is meant for unreinforced concrete.  It seems logical that if the concrete has to pop out past horizontal reinforcement that the shear friction the horizontal reinforcement produces could be used to resist the pop out and that if the pop-out happens adjacent to vertical reinforcement that you could count on the strength of the steel developed above and below the pop-out to resist the pop-out. 


I have not seen this is a design guide but I have seen engineers do it.


From: Rich Lewis [mailto:seaint03(--nospam--at)]
Sent: Wednesday, April 19, 2006 12:46 PM
To: seaint(--nospam--at)
Subject: Reinforcing for Anchor Bolt Breakout

Are there any practical ways to reinforce a footing for concrete breakout of anchor bolts as defined in ACI appendix D, section 5.2?  If Break Out is the controlling factor in the design of the anchor, and I don’t want to design the footing thickness based on anchor bolts, what would be a reinforcing configuration to strengthen the breakout capacity?


Thanks for any insight.




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