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RE: IBC Siesmic Loading

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You'd better get yourself a copy of the IBC if you want to use it.

There is a "Seismic Design Category E" based on Seismic Use Group and the
expected ground motion. There is also a Site Class E, based on soil type.
The IBC seismic methodology uses two ground motion values from contour maps
for the U.S. that are included in the code. The first of these is the
percent of g for 5% damping and a 0.2 second spectral response, the other is
for a 1.0 second spectral response, both for Site Class B. Maybe the "S"
values you mention are intended to correspond to these.

To order a copy of the 2000 IBC, check the following website.

http://www.icbo.org/wsnsa.dll/prodcat.html?catid=I-C-IBC&pcats=allICBO,I-Cod
es&stateInfo=dkbpdwdOfbcMlkfj9337|2

-----Original Message-----
From: MJL Engineering Ltd. [mailto:mjleng(--nospam--at)uniserve.com]
Sent: Monday, March 11, 2002 11:53 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: IBC Siesmic Loading


We are working on a project north of Japan .......a modular constructed
building and the siesmic loading is refered to as
IBC   Class E   (don't know what Class E is????)

S = 0.5 G   ( there are two S values .....why????)
S = 1.5 G
I = 1.25   ( I take this as the importance factor to be utilized????)

We need to know what these values are listed and if the IBC has different
formulaes to calculate the Siesmic shear, please advise what they are......I
don't have a copy of the IBC
Thank you for your responses

Jamie Lawson  P.Eng.
MJL Engineering Ltd.


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