×
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!
  • Students Click Here

*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

Jobs

6" 2-way concrete slab to wall connection

6" 2-way concrete slab to wall connection

6" 2-way concrete slab to wall connection

(OP)
A current project has a 6" 2-way concrete slab supported by interior steel posts and 8" masonry walls at all exterior edges.

The contractor is pushing to lay the masonry block up to the bottom of the slab with no bond beam or tie beam.

I would like any input on this as I have not seen it done and would like to see more continuity with the wall (btw, the design works without relying on stiffness from the wall).  Also, I find no limitation in ACI.

Thanks.

RE: 6" 2-way concrete slab to wall connection

I don't see a problem with it.

RE: 6" 2-way concrete slab to wall connection

Normally minimum steel rebar will be enough to ensure continuity enough; it was when wood members, or precast members were used that some perimetral members were truly required to keep geometry as projected along the life of the building. Better ensure that two bars run all along the limits, yet at 6 inch thick it is not uncommon to forfeit embedded members since so small depth makes difficult their proper construction.

The main concern, then (except the dimensions bewteen structural joints are excessive) is proper behaviour of the joint; the slab will rotate at the support and some notional eccentricity is to be accounted when checking the wall.

RE: 6" 2-way concrete slab to wall connection

The slab has a tendency to curl upward at corners.  Some refer to these as "corner-levers".  To prevent that, you should tie all corners down through the block to the foundation.  

The bond beam is not strictly required, but it prevents the slab concrete from flowing down the open cells.  The slab should be tied to the block with nominal vertical bars hooked into the slab at about four foot centers.   

BA

RE: 6" 2-way concrete slab to wall connection

(OP)
I concur with all.  This is obviously for form-saving costs and I intended to at least do what BAretired suggested and require a KO block which will be poured continuous with the slab.  So, in lieu of a tie beam, this will be the method.

Thanks to all for your input!  Cheers.

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!


Resources