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RE: Soil Pressure

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Oops!  I overlooked concrete SMRF's (Rw =12).  I don't design them for the
work I do if a simpler system with lower Rw is available.

	-----Original Message-----
	From:	Alex C. Nacionales [SMTP:anacio(--nospam--at)skyinet.net]
	Sent:	Wednesday, January 27, 1999 10:09 PM
	To:	seaint(--nospam--at)seaint.org
	Subject:	RE: Soil Pressure

	Dick,

	I used Rw = 10(Concrete Special Moment Resisting Space Frame) taken
from our
	1992 National Structural Code. The seismic forces  in our code
conforms with
	1988 SEAOC. I recall that this is 12 in UBC 88. I do not think its a
	misprint
	maybe our code writers made some minor changes to be safer.

	C =2.75 (max. value), can be used for any structure regardless of
soil type
	or structure period.

	Base shear formula, V = ZI(C/Rw)W = .40x1x(2.75/10)W=.11W (to be
exact)

	May I ask what is the Rw value in UBC 1994? Maybe the formula is
different.

	Alex C. Nacionales, C.E.
	Iloilo City, Philippines