×
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

Modeling Roof Decks in SAP2000
3

Modeling Roof Decks in SAP2000

RE: Modeling Roof Decks in SAP2000

I don't use SAP; however, when I model roof decks I treat them in two separate ways...for non-diaphragm, I model them as flat plates, just transferring wind load.  If diaphragm, I model them as closely spaced beams using the properties of the decking (12" wide beams on 12" centers")

RE: Modeling Roof Decks in SAP2000

(OP)
That's kind of what I'm doing right now... still, there has got to be a way to model a standard roof deck, otherwise it seems like a useless feature of SAP.

KZ

RE: Modeling Roof Decks in SAP2000

If you want zero diaphragm action and only need the deck to transfer forces from gravity and wind, then I would set the f11,f12 and f22 modifiers to very small values. I would model the deck as a membrane so that it will have no out-of-plane bending stiffness.

But remember that the roof deck will act as a diaphragm albeit, a flexible one.

RE: Modeling Roof Decks in SAP2000

(OP)
I'll give that a whirl, thanks slickdeals.

RE: Modeling Roof Decks in SAP2000

2
You can set the thickness or modulus of elasticity of the deck to give you equivalent diaphragm response (gravity response shouldn't matter much).  If you calculate the in plane stiffness of the deck from the manufacturer's literature, you can calculate an equivalent thickness of steel to give the the same stiffness, and then model the diaphragm as a flat plate.  

The only problem is that beams connected to the deck may act as a Tee beam, composite with the decking.

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