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RE: question about ETABS

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What the aitch are you doing asking an engineering question in here?


From: Daniel Popp [mailto:drp181(--nospam--at)]
Sent: Tuesday, May 09, 2006 5:50 PM
To: seaint(--nospam--at)
Subject: Re: question about ETABS



The most likely explanation for the discrepancy is the contribution of the raft mass to the base shear.  In the raft model, the base shear will be reported at the base of the raft, meaning that the mass of the raft will be included in the seismic force calculations.  In the fixed model, this mass is not present, and therefore the lowest level story shear and the base shear are the same.

Daniel Popp