×
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

Modelling Floor Diaphragms on Computer

Modelling Floor Diaphragms on Computer

Modelling Floor Diaphragms on Computer

(OP)
Hey there!

I hope someone out there can shed some light on this one: is there a simple ("quick & dirty") way to account for floor diaphragm stiffness when computer modelling a multi-story building? I have a concrete slab on standard bar joists, but that seems awfully time-consuming to model accurately by parts. Is there a conservative and reliable way to account for this without detailed modelling to the nth degree?

Thanks,

David

RE: Modelling Floor Diaphragms on Computer

Most programs have built-in options to model concrete slabs as rigid diaphragms.  The nodes at each floor level are slaved together so that they translate and rotate as a rigid body.  This is the quickest method and gives reasonable results for load distribution.  The drawback is that diaphragm strut and chord forces are not automatically calculated and need to be done by hand.  If you want to more accurately account for the actual stiffness of the diaphragm, you can use shell elements.

RE: Modelling Floor Diaphragms on Computer

I know this is late; but better late than never.
I use ATAAD pro and I model diaphragm as plate element. Provide proper properties (thickness, strength, possion ratio, etc as required by your software). I found this to give good and reasonable results even with corrugated steel roof deck.

I hope this helps

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


Resources

White Paper - A Guide to 3D Printing Materials
When it comes to using an FDM 3D printer effectively and efficiently, choosing the right material at the right time is essential. This 3D Printing Materials Guide will help give you and your team a basic understanding of some FDM 3D printing polymers and composites, their strengths and weaknesses, and when to use them. Download Now

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