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Re: Steel SMRF on Conc. shearwall

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It's not discontinuous.

What you do is design the portion above the shearwall using the appropriate R factor. Then you get your reactions from the above structure, scale them by the relative Rtop/Rbot ratios and design the lower portion using the R for the lower system.

It's like treated them as two separate structures where you transfer the reactions from above to below.

It's not a soft story or anything like a vertical irregularity. In tall structures it's something to monitor and examine the combined stiffness effects and drift issues.


On 2/12/07, Casey K. Hemmatyar <khemmatyar(--nospam--at)> wrote:

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)>