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

Reinforced Concrete Design - Structural holes

Reinforced Concrete Design - Structural holes

RE: Reinforced Concrete Design - Structural holes

Obviously it isn't ideal, but I don't see the issue with it provided you do the appropriate punching shear checks taking into account the affect of the hole. The effect on punching shear isn't just the reduction of the hole width on the failure surface, but the projected width of the hole at the punching shear perimeter. The further you can keep any holes away from the column, the less of an impact they have on the total failure surface.

RE: Reinforced Concrete Design - Structural holes

I design pretty much every interior column punching zone assuming that there will be one 6" penetration right beside the column. Coordinating the placement of integrity top bars around the penetration often warrants some careful attention.

RE: Reinforced Concrete Design - Structural holes

Thank you very much guys!

RE: Reinforced Concrete Design - Structural holes


Is there a rule of thumb in placing holes?

You generally try to have openings in the "middle" strips (where possible). See Sect. 13.4 of ACI 318-11 for some guidelines.

What you are talking about can be done (with the checks performed).

RE: Reinforced Concrete Design - Structural holes

WARose is correct for the most common case of flat plate/flat slab floors.

Note that in the less common case of two-way beam-supported slabs, the ideal location is in the intersection of column strips (but not in the beam). Depending on your floor, some shear and deflection checks may still be required, but these are generally easy to solve.

just call me Lo.

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


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