×
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

what is the formula in AASHTO for the wind moment on a pole

what is the formula in AASHTO for the wind moment on a pole

what is the formula in AASHTO for the wind moment on a pole

(OP)
I am designing the footing for a light pole in a part. I need to calculate the moment from the wind pressure. I found the following formula online but do not have access to the AASHTO "Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals" to check. Can someone please verify for me if this is correct:

Wind moment = (½ x circumference x wind pressure) x (pole height^2)/2

RE: what is the formula in AASHTO for the wind moment on a pole

There isn't any formula in AASHTO for wind moment. You're assumption is correct although some people use 1/2 diameter instead of 1/2 circumference.

RE: what is the formula in AASHTO for the wind moment on a pole

I don't do AASHTO and it's been many years since I have done hand calculations of wind on poles, but my observation is that the light poles are generally tapered columns of 8, 12, 16, 18 sides, or round shapes. I guess it depends on how tall your pole is because most of the codes I know, have height factors on wind pressure. Back in ancient history, I wrote FORTRAN programs to do pole analysis and design and we broke the pole down into pieces and calculated the shear on each segment (based on its average diameter)and summed up the moments at the base. If the pole has a big wind area at the top from the lights, the wind on the pole shaft may be comparatively small.

If you have a general purpose FE program and model the pole as a step-wise tapered series of sections, you should be able to calculate the pressure on each segment in a spreadsheet. And I agree with bridgebuster that the formula should be based on the pole diameter and not the circumference.

_____________________________________
I have been called "A storehouse of worthless information" many times.

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

Research Report: Augmented Reality for Maintenance, Repair and Overhaul (MRO)
The term Industry 4.0 denotes a cluster of technologies that’s poised to fundamentally reshape manufacturing and bring about a new industrial revolution. These include 3D printing (AM), the Industrial Internet of Things (IIoT), artificial intelligence (AI) and mixed reality technologies, more commonly known as virtual reality (VR) and augmented reality (AR). Download Now
Research Report: The Next Product You Design Might Be a Service Thanks to the IoT
For this report, the editors of engineering.com interviewed companies on the leading edge of implementing products as a service with a view to describing and categorizing the types of products that can be delivered as a service and the technologies that make it possible—one company in high-tech manufacturing, another who helps ensure access to clean water in developing nations, and a third in the mass transportation industry. 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