Wind Speed-Up Topographic Factor
Wind Speed-Up Topographic Factor
(OP)
My question to all is regarding the Wind Speed-Up Topographic Factor Kzt in the ASCE/SEI 7-05 6.5.7.1 & 6.5.7.2
Is there are simplified way to address this factor? Is this ever just equal to 1 (K1, K2, K3=0)? Is this just applied in specific isolated conditions?
I'm a little confused by how I get the H, Lh, x & z values in Figure 6-4
Thanks for any help!
Is there are simplified way to address this factor? Is this ever just equal to 1 (K1, K2, K3=0)? Is this just applied in specific isolated conditions?
I'm a little confused by how I get the H, Lh, x & z values in Figure 6-4
Thanks for any help!






RE: Wind Speed-Up Topographic Factor
These apply to significant geographical features e.g. sea cliffs, escarpements, steep hills, mountains and deep valleys. If you dont have any of these features nearby then just take it as 1.
If you do, then you will need a topographical map to assess some of the factors.
Check out
http://www.topozone.com/
RE: Wind Speed-Up Topographic Factor
RE: Wind Speed-Up Topographic Factor
ASCE 7-05 section 6.5.7.1 has a list of conditions that determine when you need to use the speed-up factor. No. 3 in particular might answer your question. You need a little bit of topographic information to apply the rules.
RE: Wind Speed-Up Topographic Factor
RE: Wind Speed-Up Topographic Factor
RE: Wind Speed-Up Topographic Factor
RE: Wind Speed-Up Topographic Factor
You probably could do all the substitutions and come up with your equation and then maximize it (take derivatives, set = 0, substitute results and so on, do parametric study). Sounds like a lot of work to me. You would be better off calculating them max than to go on hearsay of what someone said. Then you'll learn something