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Re: UBC CODE INTERPRETATION (ZONE 4)

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Vinod,

I assume that the equipment is anchored to the foundation.  In that case,
the connection of the equipment to the foundation needs to be checked for
shear and overturning at the top of the foundation.  Then the
foundation/equipment assembly needs to be checked for sliding and
overturning at the soil/foundation interface.

Can you imagine a foundation that is so small that it is not capable of
providing stability for the equipment Anchored to it?  How, then, would you
determine the foundation increased dimensions and mass required for
stability?  I think, by an analysis of the shear and overturning at the
soil/foundation interface.

I believe that you are correct in your safety factor criteria, with this
added observation:  Section 1629.1 of the UBC allows that working stress
analysis may be used for evaluation of sliding or overturning at the
soil/foundation interface.  Thus, if you've determined your forces based on
the strength rules of Chapter 16, the forces at the base of the foundation
may be reduced by a factor of 1.4.

Nels Roselund
Structural Engineer

Original Message  From: Vinod Sahni <SAHNIVK(--nospam--at)nv.doe.gov>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Tuesday, December 05, 2000 7:19 AM
Subject: UBC CODE INTERPRETATION (ZONE 4)