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Re: 1630.9.1 Determination for Delta subS
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 Subject: Re: 1630.9.1 Determination for Delta subS
 From: "Simon" <shchao(nospamat)umich.edu>
 Date: Thu, 8 Jul 2004 22:48:44 0400
Dennis: It is clearly in Sec. 1630.9.1 that the
subs is calculated from a static, elastic analysis or dynamic analysis.
Assuming you already have a building designed based on 1630.2, then apply the
seismic force specified in 1630.2.1 to this building. > Obtaining all the
story drifts (Delta subs) using elastic analysis (by any program). >
Calculate maximum possible drift (including inelastic drift) during a major
earthquake by delta subm = 0.7*R*Delta subs. > Make sure Delta subm
is less than 2.5% (2%) story drift, which is the story drift limitation. If not,
increase the stiffness.
The code mentions ASD simply because the design
force combo. Also, I personally think the 0.3 inches in the design manual comes
from the elastic analysis not from 0.025H.
Simon

 References:
 1630.9.1 Determination for Delta subS
 From: Dennis Wish
 1630.9.1 Determination for Delta subS
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