[TowerTalk] Comparing Structural Standards

[k6ll@juno.com]

On Fri, 29 May 1998 22:13:42 -0700 "Kurt Andress"
<NI6W@yagistress.minden.nv.us> writes:
>Hi All,
>This is a followup to the "Formula" thread.

>Wind pressure in Lb/SqFt @ 70 Mph fastest mile basic wind speed.
>
>Standard	Height = 33'	Height=100'
>
>EIA 222-C	20		20
>EIA 222-D/E	19		24
>UBC		17		21
>CP3		22		24
>ASCE		17		20


I just saw an article on CNN yesterday, where hurricane
researchers were quite surprised to see an unexpectedly
high wind gradient in the first few hundred feet above
ground level. They found this gradient by dropping GPS
receivers into the storms, and mapping velocity vs.
height. Perhaps the standards will soon be rewritten
to incorporate this data.

Dave Hachadorian, K6LL
Yuma, AZ
K6LL@juno.com



















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