×
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

Diaphragm Options

Diaphragm Options

Diaphragm Options

(OP)
I have a simple rectangular building with roof system consisting of deep long span trusses.  The building was originally designed with 1.5" steel deck as the roof diaphragm.  The owner wants to delete the deck and go with a standing seam roof on purlins, so I'm trying to come up with other options for tranferring the diaphragm load.  Several options include diagonal cable bracing or straps.  Any other ideas?

RE: Diaphragm Options

In the past, I attached the lighter gage standing seam deck on top of 1.5" B deck diaphragm.

RE: Diaphragm Options

I haven't done much work with standing seam roofing.  However, what I have seen is so light that it would have trouble spanning between purlins.  I've always had to use a metal or plywood deck below the roofing for structural support.

RE: Diaphragm Options

We have used plenty of standing seam roofing in the apst, mostly on pre-engineered rigid frame buildings. We always use moment frames or x-bracing, and the purlins are normally at 2'-0" or so spacing maximum.

RE: Diaphragm Options

The standing seam may not be able to provide the bracing required for your truss top chords.  That is something to watch for in the truss design.  Also, with the standing seam on top of purlins, you may have a hard time transferring the lateral shear to and from the standing seam.  The idea of having the 1.5" deck with standing seam over it is a good one IMO.  Then the standing seam is not structural.

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