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Seismic deflection of tall towers

Seismic deflection of tall towers

Seismic deflection of tall towers

(OP)
I have a tall tower and seismic controls. Someone wanted to know what the maximum deflection was. As it turns out, the software I use gives me the wind deflection but not the seismic deflection. I'm sure it's due to the seismic calc being complicated. But I was wondering if there was someway to get an approximation of the deflection?

RE: Seismic deflection of tall towers

Not unusual to not calculate seismic deflection. Would tht be a quasi-static or dynamic deflection?

Deflection of towers is a concern from a process perspective as the liquid sloshing around on the trays can cause the distillation to not work as intended. Most folks, however, agree that a 1 minute seismic event over the life of the vessel will not substantially impact product quality.

Wind events can be far more frequent and so deflection is a bit more commonly a concern.

I'd ask why seismic deflection is an issue... See if you get a process argument or a P-Delta argument.

jt

RE: Seismic deflection of tall towers

The formula for the deflexion is the same as a cantilevered beam use the developemented Moment in the first or 3rd mode
 

JustoleJim

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