wind and earthquake resistant buildings

huangyhg

wind and earthquake resistant buildings
"wind and earthquake resistant buildings" is a book that i am currently reading.  it is authored by bungale s. taranath.
when i came across page 9 of the book, i found the following example:
f = v x s /d
the formula, is supposed "...to calculate the frequency of the transverse pulsating forces caused by vortex shedding...."
f = frequency of vortex shedding in hz
v = mean windspeed at the top of the building in mph
d = diameter of the building in feet
the following was proposed:
building height: building width = 6:1
natural frequency of vibration for building = 0.16 hz
assume a wind velocity of 60 mph
then "if the wind velocity increases from 0 to 60 mph (27.0 m/s), the frequency of the vortex excitation will rise from 0 to a maximum of 0.16 hz."
but how is this possible?
f = v x s / d = 60 x 0.2 / 110 = 0.11 hz, not 0.16 hz.
the equation tells a different story from what he's saying.
i tried to find the errata for this book, but i can't seem to find it.  could somebody let me know if i'm right or point me to the errata website?
shouldn't it have said 88 mph for v, since 0.88 x 0.2 / 110 = 0.16 hz.
am i overlooking something subtle?  in the book, he did say that "assuming a wind velocity of 60 mph...." for his example, but he never said that it was the mean windspeed at the top of the building.
thanks for your reply in advance!
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60 mph = 88 ft/sec if that helps.  sounds like a units problem.
thanks so much!  can't believe i overlooked that!