×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

ACI Shear Anchorage Question

ACI Shear Anchorage Question

ACI Shear Anchorage Question

(OP)
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.

RE: ACI Shear Anchorage Question

ACI Anchorage section is Appendix D - but I don't know if it has shear key design in it.

RE: ACI Shear Anchorage Question

(OP)
Thanks JAE,  I know all about Appendix D and there is not anything about shear key design in there.  I guess I meant is there anything in another section that I am missing or maybe in the new ACI-05 code.

RE: ACI Shear Anchorage Question

AISC has a Design Guide #1 for Base Plates.I think you can download the pdf for free. It specifically designs for Shear Lugs or Keys welded on the bottom of the Plate. Good Luck

RE: ACI Shear Anchorage Question


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 The reprint is still available from ACI for about $15.00, however the anchor bolt design method has been replaced by the CCD method described in Appendix D of ACI 318-02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

RE: ACI Shear Anchorage Question

(OP)
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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Engineering as It Should Be - Chapter 2: Document Security
This ebook covers basic tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Chapter 2 covers cybersecurity and answers the question: How do you secure your files and documents? Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close