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

Related Articles


Wind load on grills and grates-request for references

Wind load on grills and grates-request for references

Wind load on grills and grates-request for references


Sometimes architects specify louvre kind of cladding. This is less porous than a plane truss, and the idea of solidity ratio comes into mind but I can not be sure, because grates and grills are more flexible and less porous

Any idea will be highly appreciated



RE: Wind load on grills and grates-request for references

I usually ignore the porous,or grated, materials and treat them as solids.  I do this because in the future, the material may change to solid.  Or, a large piece of plastic might blow up against it and create a solid sail.

Or, someone might want to put a banner or sign over it and thus make it solid.

I once had an aerospace engineer friend of mine point out that the guy-wires on a biplane have more drag in the wind than the wings themselves.  With that thought in mind, an "open" grating doesn't sound like it would have all that much less drag on it than a solid surface.

RE: Wind load on grills and grates-request for references

If it is cladding then you should consider worst case of treating it as porous or solid.
For freestanding panels you can take porosity into account by factor Kp=1-(1-d)^2 where d is solidity ratio. e.g. for 25% solid face Kp=0.438. [AS 1170.2 D1.4]

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!


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