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Pile Cap Restraint

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UBC Section 1807.2 INTERCONNECTION requires that pile caps subject to
seismic loads be interconnected by ties (grade beams), however there is an
EXCEPTION for alternative methods.  One of those alternate methods is to
use passive pressure on the pile cap as shown in Example 55 of the Seismic
Design Manual, Volume I.

My question is, in order to comply with the minimum 10 percent horizontal
force AND if you have seismic lateral load at the pile cap (say from the
reaction of a steel column) would you:

A.)  Include the seismic lateral load in addition to the minimum 10 percent
lateral load

B.)  Use only the minimum 10 percent load as shown in Example 55

C.)  Use the larger of the applied seismic load and the minimum 10 percent
lateral load

D.)  Some other combination or method


Thomas Hunt, S.E.
Duke/Fluor Daniel


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