6/5 Beam Column Capacity
6/5 Beam Column Capacity
(OP)
Hi,
If I have two beams framing into a concrete column for a special moment frame, one beam is part of the special moment frame and the other is a cantilever beam, do both beam capacities need to be considered when computing the requirements for strong column-weak beam, or only the special moment frame beam?
Thanks.
If I have two beams framing into a concrete column for a special moment frame, one beam is part of the special moment frame and the other is a cantilever beam, do both beam capacities need to be considered when computing the requirements for strong column-weak beam, or only the special moment frame beam?
Thanks.






RE: 6/5 Beam Column Capacity
It's about protecting the column, making sure it's not the weak link in the system. So everything has to fail before the column, including non-lateral elements like slab rebar and PT.
RE: 6/5 Beam Column Capacity
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RE: 6/5 Beam Column Capacity
For cantilever I would say no, with a caveat. If the cantilever reinforcement is heavier or in addition to the special moment frame beam reinforcement and developed past the column then I would make sure to count that in your beam capacity that the column has to be designed for.
RE: 6/5 Beam Column Capacity
Column strength > 6/5 x (SMF Beam Strength + Cantilever Gravity Moment Present @ EQ)
That cantilever moment will be present and drawing on the column capacity when the SMF beam hinges.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: 6/5 Beam Column Capacity
Is it 1.2*DL + 1.6*LL
or, is it (1.2+0.2*Sds)*DL + 1.6*LL?
Or, some reduced factor for LL (1.0 or lower)
RE: 6/5 Beam Column Capacity