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vortex shedding

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to Christopher Wright and other vesselmen,

H.Bednar in his PVDH, and as far as I know the paper of Zorrilla and 
Mahajan (and also the ISO 4354) considers the wind load acting only onto 
the upper third of a column while checking vortex shedding instability.

Does any one of you know the justification of this assumption?, because 
wind is phisically acting all along the column.

thanks in advance