×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Minimum design wind load

Minimum design wind load

Minimum design wind load

(OP)
Greetings,
As per ASCE7-10 section28.4.4 , the minimum design wind load shall be 0.77 kN/m2 for wall and 0.38 KN/m2 for slab , my question, is the value of P=q *( GCpf - GCpi) shall calculate for each each wind exposed element ( leeward, windward , end zones , side pressure,…….etc) and then compare with the min. Values above and take the max.
For sure there are many values will be lesser than the above min. Values , because of this i feel there is another condition to use the above min. values, please see snap below and advise.



Thank you

RE: Minimum design wind load

I'm not entirely sure what your question is. You are correct that these are the minimum values, as stated in ASCE 7-10. These apply to the wind load you use in the load combinations. In other words, if you run through all of your calculations and determine that the applied wind load would be 13.8psf on the wall, you use 16psf. If you determine it should be 24psf, you use 24psf. So if you're doing ASD, 0.6W=9.6psf for the minimum (which is approximately 10psf as required by earlier editions of the code) or for LRFD 1.0W=16psf for the minimum (which is equal to the 1.6*10psf as required by earlier editions of the code).

What other condition do you feel it's appropriate to use this? It sets a floor for the applied wind loading to ensure buildings aren't under-designed, since the formulas we use can under-predict loading at the low end.

RE: Minimum design wind load

(OP)
I mean, these minimum values shall be applied to all elements , for example if the windward and leeward are both lesser than the minimum i have to increase both of them to be 16psf. I feel the total pressure on the building will be too much especially for steel building.

Thank you

RE: Minimum design wind load

Why would the wind care what the building is made of? If it hits a flat surface, it'll exert a pressure. Sure, a loose sail will likely experience a different loading than a 1" steel plate, but for all practical purposes in structural design the cladding is going to be stiff enough that it doesn't really matter.

The minimum load provisions in chapter 28 are the same as those in 27. The application is explained in the commentary of chapter 27. They even give you a picture.

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

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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