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Tall Tower Overturning Moment - Wind & Seismic

Tall Tower Overturning Moment - Wind & Seismic

Tall Tower Overturning Moment - Wind & Seismic

(OP)
I have to design a base ring for a tower which is 100" diameter x 50ft. tall. Out of the top center of the tower is a 24" diameter duct that elbows to the side of the tower and then down the side of the tower. How do I account for the projection of the 24" duct above the top of the tower in the overturning moment calculations for wind and seismic scenarios?

Thanks.

RE: Tall Tower Overturning Moment - Wind & Seismic

It's just extra area to pick up wind and extra mass to whip around in an earthquake right? Or am I missing something important?

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RE: Tall Tower Overturning Moment - Wind & Seismic

Check wind moment in two directions, one with the duct at right angles to the wind (pick up extra wind area and moment), one with the duct downwind (with eccentric weight) and see which controls. Check seismic moment with additional mass from the duct and eccentric loading from the duct.

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