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RE: Seismic mass

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The seismic "loads" are not loads per se. That is why we refer to them as pseudo-static. The basement structure will essentially move with the ground. The structure above the basement level will have an inertial response to the movement of the ground and basement.

Harold Sprague

From: "Javier Encinas" <asdip(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Seismic mass
Date: Tue, 7 Feb 2006 13:13:39 -0400

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

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