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IBC Seismic

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As a former UBC’r, I’m being baptized into the structology of QsubE, Sds, and an Esubm that has no “subm” in ASCE 7, because confusion is apparently sacred. 


For a “structural steel system not specifically detailed for seismic resistance (R = 3), I am enlightened that vertical seismic effects can be roughly ½ of horizontal effects (ref Eq


Does that sound right?


How did the UBC ASD method survive without this?  How could they be so naïve and ASCE 7 be so righteous?


Ed Tornberg

Tornberg Consulting, LLC