×
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

Calculating Wind Speedup Kzt Factor from ASCE 7

Calculating Wind Speedup Kzt Factor from ASCE 7

Calculating Wind Speedup Kzt Factor from ASCE 7

(OP)
I was wondering if anyone had any insight on the requirements for Kzt. ASCE 7 give some requirements for when it applies, and all have to met, and I'm not sure what some of them refer to. The first requirement states it is "isolated and unobstructed upwind by other similar topographic features of comparable height for 100 times the height....or 2 miles." What is considered a comparable height?

The second requirement is the most confusing one. It says:

2) The hill, ridge, or escarpment protrudes above the height of upwind terrain features within a 2 mile radius in any quadrant by a factor of two or more.

Protrude from what? what is the base elevation to be used? Surely not sea level. Do you figure an average elevation over the entire area of the 2 mile radius? Cause I could have a hill top that is at an elevation of 1000' and the base is 500' and there is a nob in the hill that is at 900'. So the hill is 500' and the nob is 400', which isn't a factor of 2, but what should really be used as the base elevation?

The other question is the H - height of hill relative to upwind terrain. It's easy is you have a single hill in the middle of a plain, but if you're in the middle of a mountain range, what is the elevation of the upwind terrain? Once again, do you assume some average over the 2 mile distance?

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