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Start with UBC Section 1634.  UBC Section 1634.1.6 (weight of drums compared to structure) will determine whether you use Fp for just the drums or V formulas for the combined drum and structure.  Then review UBC Section 1634.2 to determine whether your combined system is "similar to buildings"; this will lead you to the applicable "R" factor.  If the contents of your drums are considered hazardous then a typical importance factor using Fp would be 1.5 and 1.25 if using V.  See UBC Table 16-K item 2.

Thomas Hunt, S.E.

"Stefan Reumers" <Reumers.S(--nospam--at)>
02/15/2006 07:57 AM
Please respond to seaint
        To:        <seaint(--nospam--at)>


        Subject:        UBC 97 - SEISMIC DESIGN GRANULAR SILOS


I have to design 24 aluminium silos 720 m3 each for the storage of granular Polyethyleen.
These silos are mounted on a 20 m high concrete structure.
Prescribed earthquake code is UBC ’97.
Does Section 1632 apply or can I use Sections 1634 together with Section 1630 ?
This makes quite some difference in the total lateral force.
In addition, our customer asks for an importance factor of 1,50 as to my opinion granular storage silos would only require an importance factor of 1,0.
Any help would be much appreciated
Stefan Reumers
Engineering Silo Dept.
Ellimetal nv

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