Seismic System designation Question
Seismic System designation Question
(OP)
I am designing a free standing mezzanine with moment connections at the beam to column connections. I plan on leaving the column pinned to the footing to reduce the footing size.
So my question is this: What seismic sytem would this be considered according to the IBC? My initial thought was an inverted pendulum system with ordinary steel moment frames. This yields a very low R value though, so I'm not sure this is correct. Would it still be appropriate to consider it a moment resisting frame and use a higher R value?
I guess the real question is what makes a moment system an inverted pendulum system?(versus a moment resisting frame system)
I've been looking for an explanation, but as yet, have been unsuccessful.
Thanks for the help.
So my question is this: What seismic sytem would this be considered according to the IBC? My initial thought was an inverted pendulum system with ordinary steel moment frames. This yields a very low R value though, so I'm not sure this is correct. Would it still be appropriate to consider it a moment resisting frame and use a higher R value?
I guess the real question is what makes a moment system an inverted pendulum system?(versus a moment resisting frame system)
I've been looking for an explanation, but as yet, have been unsuccessful.
Thanks for the help.






RE: Seismic System designation Question
Look in the definitions for pendulum system in the IBC 2000 in section 1613
RE: Seismic System designation Question
Didn't think to look at those definitions.
RE: Seismic System designation Question
RE: Seismic System designation Question
For a frame, there would be multiple columns or lateral elements carrying vertical and lateral loads.
The higher R value prescribes for less paths to provide stability ( there's only one column) should failure occur in that single element.
I agree with SperlingPE. You describe multiple supports. So you have a frame.