Contact US

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

Slab-beam connection?

Slab-beam connection?

Slab-beam connection?


1) I model a beam under the slab in Etabs. What kind of connection does Etabs presume between them, rigid or no connection at all?
2) How can I "tell" Etabs that the beam is under or above slab? I need this info. for exporting the exact model to Safe (or I  can't do this in Etabs, but I can correct the vertical position in Safe).


RE: Slab-beam connection?

You can specify the location of the beam by using the "specity frame insertion point" By default ETABS places the top of the beam at the center of the slab. You can change this by changing your insertion point. And I think ETABS assumes a rigid connection between the beam and slab. I know it assumes composite action in case of a steel beam and concrete slab.

RE: Slab-beam connection?

Remember that ETABS transfers the loads only at the end points of elements.

You need to provide as many segments to beam and slab (meshing) in order to achieve near uniform/accurate mass distribution in the model.I would recommend at least three divisions on each elements.If you do not segment slab and beams load from slab will directly pass to columns, thus you will get a beam under designed.

Connections will be "rigid" (although this is not a connection a tall, the RC structure are monolithic)

hope that helps.

RE: Slab-beam connection?

"ETABS converts the object based model into element based model for analysis and results are reported back on the object based model". If this statement is true, then what is the necessity of doing many segments to beams and slabs?
As per my knowledge ETABS can do this process internally and no need of segments.

RE: Slab-beam connection?

If the slab has been defined as SHELL then meshing it will be necessary for the correct transfer of vertical loads.  A minumum of three segments per side is often enough mesh refinement.  If the slab has been defined as MEMBRANE you won't have to mesh it.  The beams DO NOT need to be segmented in order to achieve correct load transfer.

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


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