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RE: Seismic Zones in Texas

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Also, the peak ground accelerations corresponding to these two periods can
be used to construct a site-specific response spectrum similar to the
generalized one at the end of Chapter 16 in UBC.  The flat part of the
spectrum is defined by Sa = 2.5*PGA@0.2sec <mailto:2.5*PGA@0.2sec> , and the
curved part by Sa = PGA@1.0sec/T.

	-----Original Message-----
	From:	Harold Sprague [SMTP:harold.sprague(--nospam--at)neenan.com]
	Sent:	Tuesday, January 12, 1999 8:33 AM
	To:	'seaint(--nospam--at)seaint.org'
	Subject:	RE: Seismic Zones in Texas

	James,

	The 0.2 and 1.0 second are the defined short period events and long
period
	events.  In the IBC and 1997 NEHRP both events must be evaluated.
Some
	structures will be more susceptible to short period events and some
will be
	more susceptible to long period events.

	And you are correct in your inference that earthquakes will not
necessarily
	have these frequencies.  The intent is the 0.2 and the 1.0 second
are the
	representative design events.

	Regards,
	Harold Sprague
	The Neenan Company
	harold.sprague(--nospam--at)neenan.com


	-----Original Message-----
	From: james korff [mailto:jgkorff(--nospam--at)yahoo.com]
	Sent: Saturday, January 09, 1999 3:23 PM
	To: seaint(--nospam--at)seaint.org
	Subject: RE: Seismic Zones in Texas



	Clarification requested:

	0.2 and 1.0 periods in the maps.
	What do they refer to?
	What about periods in between?

	jgk