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?
Eng-Tips is the largest engineering community on the Internet
Intelligent Work Forums for Engineering Professionals
-
Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Seismic deflection of tall towers
- Thread starter Bobfromoh
- Start date
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
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
Justolejim
Industrial
The formula for the deflexion is the same as a cantilevered beam use the developemented Moment in the first or 3rd mode
JustoleJim
JustoleJim
- Status
Similar threads
- Locked
- Question
- Locked
- Question
- Locked
- Question
- Locked
- Question