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Re: seismic design of storage tanks, UBC 97

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UBC Sec. 1634 applies to nonbuilding structures that are self-supporting.

UBC Sec. 1632 applies to parts of structures and equipment that is
supported by a structure.

1) Flat Bottom Tanks should be designed in accordance with UBC Sec. 1634.3.
This section allows design either as a rigid structure per Sec 1634.3 (the
reference to Sec. 1632 is errata) using the entire weight of tank and
contents or per a national standard that separately accounts for the weight
and contents.

2) Hopper bottom tanks supported on braced legs should be designed in
accordance with UBC Sec. 1634.5 with an R value of 2.2 taken from Table
16-P.  The base shear should be determined in accordance with equations
30-4 and 30-5 (the reference to Sec. 1645.2 is errata).  Base shear
minimums should be determined with equations 34-2 and 34-3.

Regards,

Rick Drake, SE
Fluor, Aliso Viejo, CA

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                      s s                                                                                                              
                      <steven1870@yahoo.c      To: seaint(--nospam--at)seaint.org                                                                   
                      om>                                                                                                              
                      01/21/03 02:36 PM        cc:                                                                                     
                      Please respond to                                                                                                
                      seaint                   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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