Wind load for rotating flags
Wind load for rotating flags
(OP)
Hello I am designing a flagpole which has a moving element at the top that allows the flag to rotate 360 degree in the direction of the wind. In this condition, what code do I use as per ASCE ? My manufacturer indicated a reduction of load to 20percent of the total flag size as the flag is a moving element. Can anyone guide me on this code?





RE: Wind load for rotating flags
RE: Wind load for rotating flags
RE: Wind load for rotating flags
RE: Wind load for rotating flags
Many years ago I had to check one of our street light poles for a couple of banners hung on them to advertise something or another. Two small posts cantilevered from the pole and the banner would attach between them. Now, street light poles are pretty flimsy and if the banners stayed attached, it would fail the pole. I came up with the idea of the lower attachment being a snap away clip which would release in about a 30 mph wind. The banner then acted like a flag hung vertically and I could use the free banner equation to calculate the drag on the upper post to see if the pole was overloaded.
_____________________________________
I have been called "A storehouse of worthless information" many times.
RE: Wind load for rotating flags
RE: Wind load for rotating flags
http://www.acmelingo.com/flagpoles/FP1001-07.pdf
The equation for the flag load says something about it being based on tests done by towing flags behind airplanes which is what I remembered from 20 years ago. I think you have already referenced this document and I have not done much reading of it, but I guess I don't get the distinction between a free rotating flag and what you describe as a fixed flag. They both flap in the wind and have some drag applied to the pole.
If you want lots of equations, I found this paper:
http://www.technion.ac.il/~amanela/avshash_files/J...
_____________________________________
I have been called "A storehouse of worthless information" many times.