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seismic design of storage tanks, UBC 97

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Which are the appropriate equations in UBC 97 for base
shear in:
1) a bolted steel tank (flat bottom, anchored to
foundation), and 
2) a bolted steel tank (hopper bottom supported on
braced legs), both storing granular material?

1) flat bottom tank on concrete - is this covered by
section 1634.5 Other Nonbuilding Structures, with
V=0.56CaIW (equ 34-2)?  If so, two more questions:  is
equ 34-2 used instead of equ 30-4 thru equ 30-7 or in
addition to them, and is it appropriate to reduce V by
R=2.9 as mentioned in section 1634.1.2?

2) hopper bottom tank supported on braced legs - is
this covered by section 1634.4, which refers back to
section 1632, so that base shear would be Fp=4.0CaIpWp
(equ 32-1)?  And again, is it appropriate to reduce by

Any guidance or suggestions would be greatly
appreciated, thanks
Steven Stoppkotte 

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