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RE: Steel SMRF on Conc. shearwall

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Wouldn’t this qualify as a “Vertical Combination”?  See CBC 1630.4.2 


David A. Topete, SE

Structural Engineer


GFDS Engineers

543 Howard St., First Floor

San Francisco, CA 94105

v : (415) 512-1301 x21

f : (415) 512-1302



From: Casey K. Hemmatyar [mailto:khemmatyar(--nospam--at)]
Sent: Monday, February 12, 2007 3:04 PM
To: seaint(--nospam--at)
Subject: Steel SMRF on Conc. shearwall


I'm doing a project in high-end residential project in southern California, where I have a steel SMRF that is supported on the top of a 14 inch concrete Shearwall.

The question I have is that, does this concrete shearwall  need to be designed as an element supporting discontinuous system? (per 1630.8.2 & Table 16-L)

My own response to this is yes, however I'd appreciate second opinion.

Casey (Khashayar) Hemmatyar
Private email <k(--nospam--at)>