From Section 5.11.1: wind pressure shall be taken from Section 5.2.1.k.
From Section 5.2.1.k: wind pressure shall be 18 * (V/120)^2 on vertical projected areas of cylindrical surfaces and 30 * (V/120)^2 uplift (note the limit set in 5.2.1.k.2).
I apologize for the equation mentioned above, I was typing too fast. The proper equation is:
Wind_Moment = ( 18 * velocity_factor * outside_diameter * height * height / 2 ) + ( wind_uplift * roof_area * outside_diameter / 2 )
As I said in my first post, the wind force or moment depends on what Section of the Code your referring to. The equation you site (Kz.Kzt.Kd.I.G....) is from Section 5.9 and is used for wind girder sizing.
Any verifications you attempt should be performed in Imperial units, I wouldn't trust the SI equations in the Code. Not only are there errors, but they use "soft conversions" - which is another way of saying they rounded to make the numbers look nice, but this means computer software yields different answers depending on which units you use. For example, the velocity factor (V/120)^2 versus (V/190)^2: this implies that 120 mph is equal to 190 km/h. In reality, 120 mph is 193.121 km/h. Maybe a small difference, maybe not - but don't expect TANK to yield the same results as your hand calcs if you use the SI equations. As stated above, TANK uses everything in Imperial units, then converts the input and output to the units you specify in the configuration.
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Regards,
Richard Ay - Consultant