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RE: Stability of highrise buildings for seismic loads

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One thing to keep in mind is that not all vibration modes under seismic loading will result in all the seismic mass/inertia moving in the same direction at the same time.  Thus, in many cases, not all the different masses at different levels will move in the same direction resulting in a concerted "mass" effort (pun intended) to over turn the structure.  And with a highrise, there will be a lot of different modes due to the large number of floors.  This does not directly answer your question, but it is something to keep in mind.
Adrian, MI
-----Original Message-----
From: Brijbhushan J. Gupta [mailto:bj_gupta(--nospam--at)]
Sent: Sunday, December 30, 2007 11:29 AM
To: seaint(--nospam--at)
Subject: Stability of highrise buildings for seismic loads

Dear members,
It is well known that actual seismic loads during earthquake can be several times design loads. Is it necessary to check stability of highrise buildings for several times design loads?
(B.J. Gupta)

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