Wind loading
Wind loading
(OP)
Hi,I did calculations for two vertical vessels on skirt support...one had a tan tan length of 5.2m and other had a tan tan lenght of 23m...in the compress report, for wind, the operating shear and bending moment values shown are different for operating and empty case....while they are same for operating and empty case in case of vessel with 5.2m vertical tan tan lenght... Why is this so??





RE: Wind loading
NEVER blindly accept ANY unusual results from your own spreadsheet, your own program, somebody's else's program, or somebody else's spreadsheet.
But, given that, the 23 meter high tower is substantially taller - further up, wind loads are higher - for the same wind speed - because the ground effect goes away. Thus, your program could be "logicing" itself into reducing the wind force on the shorter PV. There should still be some effect.
Are they the same diameter?
Are they containing the same fluids at the same weights at the same levels, and comparable densities and heights?
RE: Wind loading
RE: Wind loading
RE: Wind loading
For tall slender structures, you can also get a P-delta effect influencing the moment, but it shouldn't influence the base shear, unless, as above, it affects the natural frequency.
RE: Wind loading