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RE: ACI 318-02 Appendix D

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Title: ACI 318-02 Appendix D
I always have to rely on Draft 8, ASCE Substation Structure Design Guide for documentation of the method you use, that is checking that the failure plane leaves enough ld on the bar above the anchor head to transfer forces to the footing below.  I can't see anything in ACI that provides for this either.
Bob G.
-----Original Message-----
From: Bruce Holcomb [mailto:bholcomb(--nospam--at)]
Sent: Friday, November 19, 2004 2:52 PM
To: seaint(--nospam--at)
Subject: ACI 318-02 Appendix D

I have been asked to verify an anchor bolt design based on IBC 2003 which has either the ASD table in section 1912 or the strength design approach of section 1913 which basically just references ACI 318-02 Appendix D I typically design anchor bolts and base plates in accordance with AISC Design Guides 1 & 7, so I need to get up to speed quickly on Appendix D of ACI 318-02. 

My main question is, how does Appendix D account for the vertical reinforcing in a concrete pedestal?

Long story short... I have a reinforced concrete pedestal on an individual column footing for a fixed-base column.  My anchor bolts are 1¼" diameter by 30" embedment, which puts the nut at the bottom of the anchor bolt below the bottom of the pedestal and in the footing.  I can draw failure planes and explain that I am using the tensile strength of the rebar to transfer the load into the footing, but I am being asked by a plan reviewer to verify by Appendix D.

I remember reading somewhere that 12*AB diameter embedment in 3000 psi concrete provides strength = anchor bolt yield.  Of course, this is for the case where the anchor bolt is not near an edge of concrete.  I think this was in an AISC publication... can anybody help me find this?


Bruce D. Holcomb, P.E., S.E.

Structural Engineer

Butler, Rosenbury & Partners

300 S. Jefferson, Suite 505

Springfield, MO 65806

ph. 417-865-6100

fax 417-865-6102

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