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RE: why the moment frame must be capable to resist at least 25% of lateral loadsØŸ

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The moment frame is intended as a back up system. In case the shear walls or braced frames get substantially compromised, you want to ensure that a moment frame system capable of resisting at least fraction of a load is still working for you.

 

Ben Yousefi, SE

Santa Monica, CA

 


From: Derek Westphal [mailto:westphaldp(--nospam--at)yahoo.com]
Sent: Thursday, May 03, 2007 8:17 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: why the moment frame must be capable to resist at least 25% of lateral loadsØŸ

 

It has to do with the relative stiffness of the two systems. In order to take advantage

of the higher R factors you could just add a mini moment frame and call it a dual

system. The 25% factor is the penalty for taking a shear wall from R=5.5 to R=8.5.

hossein mardanlo <hosein.mardanloo(--nospam--at)gmail.com> wrote:

Hi,

In lateral load bearing system, where two kinds of bracing and moment frames
are cmbined, seismic codes require that the moment frame must be capable to
resist at least 25% of lateral loads. My question is what is the theoritical
point behind this requirement?

Thanks,


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