I have an application where I need to use a shear key on a base-plate to transfer the shear from a steel column to a mat foundation. Uplift = 91 kips, shear = 33.6 kips. I have used the AISC Design guide in the past but I was told to check out the ACI anchorage section as they have a design procedure for a shear key. I was looking at my ACI-02 and I guess I am blind because I can't seem to see it in there. Does anyone know where this procedure is, or maybe if its in the ACI-05 and not the 02? Thanks for your help.
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ACI Shear Anchorage Question 1
- Thread starter aggman
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VirtualEngineer
Structural
ACI 349-01 section B.11.2 describes breifly how to design for a shear lug bearing toward a free edge.
The design shear strength is 4 phi sqrt f'c acting upon the projected effective area. Phi=0.85
The old ACI 349-85 explains the method more clearly as it similar to the the old method of determining anchor bolt pullout. The reprint is still available from ACI for about $15.00, however the anchor bolt design method has been replaced by the CCD method described in Appendix D of ACI 318-02
The old method is also explained fairly clearly in AISC desing guide #7 and is available as a free download for AISC members.
Regards to all,
JPJ
VirtualEngineer
Structural
Here are the web links to find these articles:
AISC
Go to design guides.
ACI
Search for
Guide to the Design of Anchor Bolts Other Steel Embedments
Regards,
JPJ
AISC
Go to design guides.
ACI
Search for
Guide to the Design of Anchor Bolts Other Steel Embedments
Regards,
JPJ
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Thanks to everyone for there replies. I went back to the AISC method as I had used before. It turns out that since the columns are sitting directly on the mat foundation, the engineer who is stamping the design wanted me to put some rebar around the shear tab to ensure confinment of the concrete. It turned out what he was wanting me to look at was chapter 21 and its discussion of concrete confinement and not shear tab design. Thanks for the help though guys.
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