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Re: equipment anchorage in isolated structures[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: equipment anchorage in isolated structures
- From: David Topete <d.topete73(--nospam--at)gmail.com>
- Date: Sat, 16 Apr 2011 13:55:03 -0700
Thank you for the information, Harold. I ma have seen that section without really interpreting the intent. We are providing engineering for a municipality's IT/data/comm center upgrades that are in an isolated building. Seems very conservative to design for I=1.50 for anchorage of equipment above the isolation plane.
Yes, the force is reduced. Look at Section 188.8.131.52 in ASCE 7-05 and 184.108.40.206 in ASCE 7-10.
Per ASCE 7-10:
220.127.116.11 Components at or above
the Isolation Interface
Elements of seismically isolated structures and
nonstructural components, or portions thereof, that are
at or above the isolation interface shall be designed to
resist a total lateral seismic force equal to the
maximum dynamic response of the element orcomponent under consideration.
The concept is that if you are using a base isolated building, you should be able to capture the in-structure response of the nonstructural component at the point of attachment. But you are free to use the response of a building without base isolation. If the nonstructural component is light in mass, the effort to design the seismic restraint may be more trouble than it is worth. If the nonstructural component requires seismic qualification, you are able to use the reduced demand.
Regards, Harold Sprague
Date: Wed, 13 Apr 2011 17:11:01 -0700
Subject: equipment anchorage in isolated structures
I'm not having much luck in finding what the force demand is on equipment anchorage requirements within an isolated building structure. wouldn't the force be reduced since the response will be (significantly) damped above the isolation plane? I haven't found anything in either the IBC or ASCE 7-05. Thanks in advance.
David Topete, SE
David Topete, SE
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