I would like to start a new thread on the Redundancy Factor, Rho, of the 1997
I have a 2 story concrete framed building. Total base shear is 46.2 kips.
Worst case shear in a frame line is 12.2 kips, with 4 columns. Ground floor
area is 2312 SF. Now for a multi bay frame I use 70% of 2 columns to
calculate Rho. I get
ri=0.7*(12.2*(2/4)/46.3 = 0.092 (from paragraph in 1630.1)
Rho = 2-20/(0.092*sqrt(2312)) = -2.5 (eq. 30-3)
Now this Rho is less than 1.0 so Rho min = 1.0 (paragraph in 1630.1)
My question is, did I do this right? Can I calculate a Rho value less than
Richard Lewis, P.E.
Missionary TECH Team
The service mission like-minded Christian organizations
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