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RE: Seismic mass

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That has to be the most unusual analogy for seismic mass I have come across.


Couldn’t have come up with that one in a hundred years…!



BTW, aren’t you still employed by the British Secret Service?





David L. Fisher SE PE

Senior Principal



372 West Ontario

Chicago 60610



312.573.1726 fax


312.622.0409 mobile


From: mbr [mailto:seaint-list(--nospam--at)]
Sent: Tuesday, February 07, 2006 12:41 PM
To: seaint(--nospam--at)
Subject: RE: Seismic mass


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.




From: Javier Encinas [mailto:asdip(--nospam--at)]
Sent: Tuesday, February 07, 2006 9:14 AM
To: seaint(--nospam--at)
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