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Seismic force on elevated tank foundation

Seismic force on elevated tank foundation

Seismic force on elevated tank foundation

(OP)
I need to calculate the seismic force on an elevated tank foundation (deep concrete caissons/drilled piers).

I am analyzing the 7' diameter x 10' tall hazardous liquid waste tank as a "non-building structure' per ASCE 7-05 chapter 15.

I am assuming that it is rigid and 15.4.2 applies. The actual tank was designed by others.

My problem is that the base shear calculated (eq 15.4-5) is less than that calculated by ASCE chapter 13 (eq 13.3-1), so I am wondering if I made a mistake.

RE: Seismic force on elevated tank foundation

Bednar "handbook of Pressure vessels" has a section on it for elevated vertical tanks, however, his method is not a current one but the results should be closely similar.  
What acceleration value did you get to determine the seismic load.

RE: Seismic force on elevated tank foundation

Can you post your work?

RE: Seismic force on elevated tank foundation

I believe ASCE and IBC describe these as inverted pendulum structures and have very particular requirements.

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