×
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

Special concrete moment frame

Special concrete moment frame

Special concrete moment frame

(OP)
I'm designing a concrete building in SDC D (IBC 2003).  We wanted to use concrete shearwalls alone, but the SDC and height requirements are forcing us to use a dual system of shearwalls and special moment frames.

Does anyone know if it's possible to create frames that meet the "special moment frame" criteria with only using the 2-way slab instead of beams?  We have a 8.5" thick PT slabs and a ton of columns to spread the load to, so it would be attractive, if possible, to not have to add beams.  However, based on my reading of the ACI tie/reinforcing requirements for special moment frames, I don't see that it would be possible without beams.  My boss is convinced he's seen it done in other buildings but I'm wondering if the requirements may have changed.

Can anyone help?

RE: Special concrete moment frame

You can not create an SMRF using 2-way slab system. I had a very similar situation and had asked the same question to ACI a while back and below is their explantion:

As stated in Paulay and Priestly, Seismic Design of Reinforced Concrete and Masonry Buildings, "flat slab systems supported by columns is considered to be unsuitable on its own to provide satisfactory performance under seismic actions because of excessive lateral displacements and the difficulty to providing the adequate and dependable shear transfer between columns and slabs, necessary to sustain lateral forces, in addition to gravity loads."

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