Antenna Deflection Requirement
Antenna Deflection Requirement
(OP)
Hello-
I wonder if some of you RISA Tower users or other experts can help me understand a requirement. The requirement states "maximum sway of 0.4 degrees from the top or 2% of the height, whichever is less". I can certainly calculate the deflection due to wind and compare to 2% of height. I am asking about the meaning of sway in degrees from the top. Is that the calculated slope of the deflected shape? I see that RISA calculates a "tilt", but I don't know physically what that means (not a user). Perhaps it's the same thing?
Thanks
rd78
I wonder if some of you RISA Tower users or other experts can help me understand a requirement. The requirement states "maximum sway of 0.4 degrees from the top or 2% of the height, whichever is less". I can certainly calculate the deflection due to wind and compare to 2% of height. I am asking about the meaning of sway in degrees from the top. Is that the calculated slope of the deflected shape? I see that RISA calculates a "tilt", but I don't know physically what that means (not a user). Perhaps it's the same thing?
Thanks
rd78






RE: Antenna Deflection Requirement
RE: Antenna Deflection Requirement
The 0.4 degrees would be a sway limit, but the 2% would be a deflection limit.
According to the RISA TOWER manual, they call sway "tilt".