I am using 1997 UBC for the first time. I am a little confused with this
My understanding from reading the code, the E and Em factors here are to be
used in the load combination equations of Section 1612. I guess the first
question is, what are these values? Are these values I use to design
individual members, or values I use to do my frame analysis with? Do I take
my base shear calculated in equation 30-4 and multiply it by these factors to
use in my frame analysis?
It appears to me that equation 30-1 combines a ratio of the horizontal and
vertical load to a maximum seismic load. For a frame analysis, is this a
maximum horizontal load? Equation 30-2 combines a seismic amplification
factor with a horizontal load. Is this also a maximum horizontal load?
Thanks for your help in understanding this.
Richard Lewis, P.E.
Missionary TECH Team
The service mission like-minded Christian organizations
may turn to for technical assistance and know-how.