×
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

Two-Way Slab Edge Support
4

Two-Way Slab Edge Support

Two-Way Slab Edge Support

(OP)
In the design of a two-way flat slab, would it be appropriate to consider that a "column strip" exists along the perimeter of a building that has a continuous 10" thick concrete foundation wall.  If the slab is connected to the wall with dowels, would there not be a region of negative moment that is present in the slab adjacent to the wall?  Or is it more practical to consider that the concrete foundation wall is much more rigid than the slab, therefore, the concrete foundation wall will resist the negative slab moment in this region.

RE: Two-Way Slab Edge Support

I believe there is still a column strip parallel to the edge beam. You still must consider the stiffness of the wall beam in determining the moments in the slab column strip.

RE: Two-Way Slab Edge Support

Is important to consider the moment acting in the concrete foundation wall for the slab loads reactions, to prevent future problems on the concrete foundation wall.

RE: Two-Way Slab Edge Support

Mike7177,

If the wall is acting as a support, then the slab moment in the area of the wall will be similar to the middle strip moment, so I would continue the 25% of the top reinforcement that has been placed in the middle strip parallel to the wall to the wall. The remainder of the reinforcement that would have been placed in the column strip is replaced by the wall.

RE: Two-Way Slab Edge Support

No columns, no column strip.

RE: Two-Way Slab Edge Support

if it's a continuous support, there's nothing to worry about.  throw some minimum steel if you want.  in the orthogonal direction, there will be some negative moment.  chapter 13 should have all of the factions by which to factor Mo in that condition.  

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