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RE: Seismic mass

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I agree with Paul and Tim,
 
The seismic mass is only considered above the grade for the lateral system of the building.  It is like taking 2 golf balls and glueing one on top of a stick and one at the bottom of the stick.  Assuming the bottom of the stick is on top of the table,  when the stick gets moved the golf ball mass at the top of the stick constributes to the lateral force on the stick and not the one at the bottom of the stick.
 
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From: Javier Encinas [mailto:asdip(--nospam--at)onelinkpr.net]
Sent: Tuesday, February 07, 2006 9:14 AM
To: seaint(--nospam--at)seaint.org
Subject: Seismic mass

Just a conceptual question: If the building has a basement, do you include the basement in the calculation of the seismic mass, or only the portion above ground? Thanks in advance.
 
Javier Encinas, PE