Post subject to wind
Post subject to wind
(OP)
If I have a round post sticking 6m up in the air, how much relative wind pressure will there be on it. I've seen a formulae for a flat surface of 1.38v2 (/m2) but I'm guessing there will be a coeficient to lower this slightly for a round section? Lamp posts seem like they must have quite a reduction over a flat face of the same dimensions.
Digressing slightly, why should there be a different value for whether wind pressure is acting in the country or near the sea, surely a gale is the same speed where ever it is.
Thanks
Digressing slightly, why should there be a different value for whether wind pressure is acting in the country or near the sea, surely a gale is the same speed where ever it is.
Thanks






RE: Post subject to wind
The roughness of the ground surface affects the wind speed greatly in the first 10m or so above the surface. Wind coming off water is not slowed by friction as much as wind blowing across land. Therefore, the coefficients applied to the wind pressure calculations, accommodate these differences.
Wind pressure computations are a bit more complex than one would guess at first glance.
RE: Post subject to wind
Then there is a events called cyclones (hurricanes, typhoons, tornadoes) that normally start in the sea and will travel inland only a small distance (100km or so).
However to help you with your poll problem the code you are using would be helpful.
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: Post subject to wind
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RE: Post subject to wind
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BA
RE: Post subject to wind
I think I know the the natural frequency of my pole but I can't seem to make sense of that Strouhal number. I can't ssem to find a calculation for the frequency of the vortex shedding tying in with anything other than the NF which is known.
It's only a pole !!!
RE: Post subject to wind
BA
RE: Post subject to wind
RE: Post subject to wind