I am designing a steel braced framed structure to support a rooftop equipment penthouse and exhaust stacks, structure is 65'overall in height in a SDC D. Believe structure will meet inverted pendulum definition. I am trying to decide most appropriate non-building structure type. Considering inverted pendulum R=2 from table ASCE 7-10 15.4-2 and would like to avoid special seismic detailing if possible. Height to width ratio of structure probably 1.5 to 2. Trying to envision how I will satisfy inverted pendulum moment analysis requirement for steel braced structure. More easy for me to envision satisfying this for say a single shaft support water tower but not a braced frame. Perhaps one could someone increase the applied shear using the in a ELF analysis to produce the desired moment envelope? Further complicating...believe I will be forced into modal analysis by a weight irregularity not sure at all how to tackle moment envelope there?
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