huangyhg

when to use special seismic load from asce7-02?
the special seismic load of 9.5.2.7.1:
em=omegaqe +- 0.2sdsd
is to be used "where indicated" in the code...
my question is, where do you use this special seismic load, em, besides 9.5.2.6.4.2 (collectors and collector connections)?
do i use em anywhere else besides for collectors? i hunted through the code couldn't find anywhere else besides 9.5.2.6.4.2...
thnaks.
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depending on your slfrs, it will kick in on your detailing requirements in a few places. for example, in aisc 341-02 it is sprinkled out for some of the slfrss, it is also referenced in the
i have sdc d but ordinary concentric braced frames because i am under 35'...
in the 2002 seismic provisions, you are required to design all parts of ocbfs (with the exceptions noted) for the amplified seismic loads. in the 2005 provisions, the "
hey blake989, i see the part in aisc 341-02 that says the columns have to be designed for amplified seismic (sec 8.3 pg 12) but are you saying that the braces themselves (i am using diagonal hss in my ocbf) have to be designed for amplified seismic as well? i thought the braces themselves simply have to be designed for
rho*qe+_0.2sdsd
maybe i'm wrong...can you tell me where i can read about the braces needing to be designed for amplified em? thanks for the help.
in aisc 341-02 section 14 is for ocbf, part 14.2 discusses required strength of
blake989, i think i agree with your interpretation...section 14 on 341-02 calls for all members to be designed for the amplified load, and the glossary defines that as using omega...
the 1997 aisc seismic provisions (yellow book) doesn't require amplified for
structural steel systems not specifically detailed for seismic resistance.....sdc c or less, this will bail you out of the seismic provisions.
you reference the "new one", depending on your building authority, some locations have made the move to the 2006ibc, which incorporates an even "newer one"....341-05
where does it say that sdc c or less doesn't need seismic provisions? that should've been step 1 for me! i am in sdc d but still that is an important section.
i looked at aisc.org and 341-05 takes it back out again for ocbf, so again it's e and not em for ocbf.
thanks.

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