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RE: Braced frame + concrete shear wall Dual system[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Braced frame + concrete shear wall Dual system
- From: "Ben Yousefi" <Ben.Yousefi(--nospam--at)SMGOV.NET>
- Date: Tue, 15 Aug 2006 08:34:28 -0700
- Disposition-notification-to: "Ben Yousefi" <Ben.Yousefi(--nospam--at)SMGOV.NET>
The effect of ramp on the distribution of lateral loads is a complex issue. Most people in seismic design use a 3D frame program and include the ramp is their model to get as realistic a distribution as possible.
Combination of braced frame and shear wall is not a dual system. Dual system combines a rigid system (i.e. braced frame) with a more flexible system such as a moment frame. It also requires that the moment frame be able to resist 25% of the lateral load. In your case you are basically combining two different system and you need to use the lower R for your overall system design.
Drift ratio is a unitless number. Therefore, it doesn’t matter if you are using the metric system.
Ben Yousefi, SE
From: Anantha Narayan
I am designing a parking garage for a project in
The job is in Seismic Design category D with Ss = 1.71 g and S1 = 0.68 g. The building is 14.6 m tall. and has plan dimensions of 39 m x 70m.
We are using (thinking of using) chevron braces in addition to concrete shear walls at the ends. Is this dual system uncommon as I did not find any reference to the same in IBC 2003. Will using an R value of 5 (for the SCBF) be very conservative? If not, what is a means to calculate a more realistic R value? Also, can ASCE 7-02 drift table value of 0.02 Hsx be used in metric since there are no metric values mentioned in parantheses.
I am fairly new to seismic design and have mostly been engineering for
wind (work in
ANANTHA NARAYAN, E.I.
Bliss and Nyitray Inc.
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