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RE: seismic design of storage tanks, UBC 97

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First of all, please note the following reference corrections per the
errata:

1. In section 1634.4, the reference to 1632 should be to 1634. 

2. In section 1634.5-1., the reference to 1645.2 should be to 1630.2. 

For a flat-bottom tank, equation (34-1) as given in 1634.3 may be used, as
permitted by 1634.4. 

For an elevated tank, equations (30-4) thru (30-7) should be used with an
appropriate R-value (2.9 for bins and hoppers storing granular material);
and equation (34-2) should be applied as a minimum (not reduced by an
R-value). 


William C. Sherman, PE
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com


> -----Original Message-----
> From: s s [mailto:steven1870(--nospam--at)yahoo.com]
> Sent: Tuesday, January 21, 2003 3:37 PM
> To: seaint(--nospam--at)seaint.org
> Subject: seismic design of storage tanks, UBC 97
> 
> 
> 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
> R=2.9?
> 
> Any guidance or suggestions would be greatly
> appreciated, thanks
> Steven Stoppkotte 
 

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