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UBC 1997 - Non building structure - Section 1632.2 for A.bolt design

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Title: UBC 1997 - Non building structure - Section 1632.2 for A.bolt design

Please refer to Lateral force per section 1632 & 1632.2 (UBC 1997).
For equipments supported on concrete pedestals (T.O.C. at grade)
The critical force for the design of Anchor bolt will be per
section 1630.2 / eqn. 32-2 / eqn. 34-1 (depends on flexible or rigid)
In this, for pedestals at grade, hx = 0 in the equation 32-2.
My question is,
What is the minimum height for pedestal T.O.C.(top of concrete) above grade,
so that hx can be taken (or about) 0. For example, if the pedestal TOC is about 2 or 3 or 4' above grade,
(for small heights above grade)
Fp increases almost 4 times than it is at grade(per eqn. 32-2).
The critical force for the A.bolt can be very high.(than it is at grade).
I could not find any reference or example in 'Seismic design manual' . Any guidance in this is
appreciated.
Happy Holidays.

Ravi Vasu, P.E.,

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