Dual System Seismic Drift 25% IMF
Dual System Seismic Drift 25% IMF
(OP)
I am using a "Dual System with Intermediate moment frames..." and "Special Steel Concentrically Braced Frames". The building is a two story classroom building classified in seismic design category D. There is a large base shear of 682K. Also, W8 columns are to be used to "fit" within the cmu partitions. W14x82 columns are located at the braced frames which are along the perimeter of the building.
While designing my moment frames for the 25% of my design seismic forces I cannot accommodate my inelastic drift limit. Though, based upon strength I have an adequate design.
ASCE7-05 is somewhat vague in it's Dual System Requirements - "IMF shall be capable of resisting at least 25% of the design seismic forces." Finally, does this statement include the drift limits of 12.12.1.1?
While designing my moment frames for the 25% of my design seismic forces I cannot accommodate my inelastic drift limit. Though, based upon strength I have an adequate design.
ASCE7-05 is somewhat vague in it's Dual System Requirements - "IMF shall be capable of resisting at least 25% of the design seismic forces." Finally, does this statement include the drift limits of 12.12.1.1?






RE: Dual System Seismic Drift 25% IMF
In short, that I see seismic drift control an issue for the whole structure, specially when diaphragm action is warranted enough; if not the IMF could work somewhat independently and then logically should keep ward off themselves of their otherwise uncontrolled seismic drift.
RE: Dual System Seismic Drift 25% IMF
RE: Dual System Seismic Drift 25% IMF
How are you modeling for 25 % lateral loads
by taking dead weight multiplier to 0.25 ??
RE: Dual System Seismic Drift 25% IMF