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RE: Pile Cap Restraint

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Tom,

I have always assumed the 10% as the default minimum.  If calculated applied
forces are greater, the calculated applied forces have been used in lieu of
the 10%.

Therefor "C".

Regards,
Harold Sprague


> -----Original Message-----
> From:	Tom.Hunt(--nospam--at)d-fd.com [SMTP:Tom.Hunt(--nospam--at)d-fd.com]
> Sent:	Friday, August 11, 2000 4:01 PM
> To:	SEAINT(--nospam--at)seaint.org
> Subject:	Pile Cap Restraint
> 
> 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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