×
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

long span curved roof + wind upflift: Your experience?
2

long span curved roof + wind upflift: Your experience?

long span curved roof + wind upflift: Your experience?

(OP)
Pals

ASCE code says there will be a serious uplift on a large part of curved roofs(wind pressure coeffs of about 0.8 to 0.9).

These roofs are usually lightly clad and uplift is usually there.

What is your experience? Simply to share with us. What are we to watch out for?

respects IJR

RE: long span curved roof + wind upflift: Your experience?

What is your roof construction?  curved girders, straight purlins/OWSJ, segmented deck/rolled curved deck?  All should be appropriately designed (lateral support) and fastened...
also, the type of roofing over the deck(?)?

Dik

RE: long span curved roof + wind upflift: Your experience?

(OP)
Thanks dik

it is curved girders and the roof is clad with just glass

respects
ijr

RE: long span curved roof + wind upflift: Your experience?

ASCE 7 has design criteria for arched roofs.  I don't know if this is what you are looking for or not.

RE: long span curved roof + wind upflift: Your experience?

Purlin members are likely laterally unsupported due to flexible fasteners for glazing; the Lu may be the full purlin length.  The curved girders can be laterally supported by the purlins. I'd be a bit concerned about the flexible attachment of the glazing with rain and wind loads; the curve can act as an 'airfoil' and produce significant uplift forces.  One of the old NBC of Canada had a publication with various loadings. These were predicated on earlier loadings prepared by the University of Bern in Switzerland.  The publication has whiskers, but is still applicable for some odd loading cases.

Dik

RE: long span curved roof + wind upflift: Your experience?

(OP)
Thanks dik

simply put great input

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