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RE: UBC97 - Earthquake

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Is the skid mounted to a foundation able to resist the sliding forces?
If not, you may have a structure that is "base isolated" to a degree as
it may tend to slide at a load lower than the Code equipment loading (or
even the base shear force if you are in a near fault area).

Bill Cain, SE
Oakland, CA

	-----Original Message-----
	From:	Studio Negrini [SMTP:stn(--nospam--at)]
	Sent:	Tuesday, February 16, 1999 12:58 PM
	To:	seaoc(--nospam--at)
	Subject:	UBC97 - Earthquake 
	Importance:	High

	I have a package ( Piping and vessel on a skid ).
	To define the horizontal force due to earthquake, in the past,
	I have used the formula :   F = Z*I*Cp*Wp  

	Now, I do not understand what is the correct section for the
	 ( plane framed steel structure ) and for the piping.
	Skid is a non-building structure and than I think that I must
refer to 
	section 1634.
	Is is correct ?
	Or I must refer to section 1632 ?

	Many thanks in advance for Your help.

	Giammarco Negrini
	Studio Negrini sas di G.Negrini e C.
	Lainate ( MI ) - Italia
	e-mail  : stn(--nospam--at)