Question regarding seismic component requirements.
Question regarding seismic component requirements.
(OP)
Equation 13.3-1 in ASCE7-05 (p.144) gives the horizontal seismic load for a component. But something I have never been quite clear on is just where this is applicable (Or: how far does it go?). Chapter 13 says that this applies for nonstructural components “for their supports and attachments”. So does this apply to the supporting steel? Just the primary support members? Or should you take the overturning force (et al) all the way to the girders?
And if you do take this force all the way to the girders, aren't you kind of "double dipping" [that is if you (of course) included the dead load of the equipment in your seismic dead load for the equivalent lateral force procedure for the whole building]?
And if you do take this force all the way to the girders, aren't you kind of "double dipping" [that is if you (of course) included the dead load of the equipment in your seismic dead load for the equivalent lateral force procedure for the whole building]?






RE: Question regarding seismic component requirements.
This includes the full load path into the main body of the building frame. Once in the main building frame, you don't have to necessarily check every beam, column, brace, etc. through to the ground.
RE: Question regarding seismic component requirements.
RE: Question regarding seismic component requirements.
RE: Question regarding seismic component requirements.
The component design is strictly for the attachment of the component as an individual load combination. This "set" of calculations uses the Fp and verifies that the component is adequately attached to the structure (i.e. the beams and girders that support it).
Once this has been accomplished, it is essentially put aside and not used in any fashion with the overall lateral force resisting system design for seismic. The calculation of base shear and the application of the main frame seismic forces WILL include the component weight in the mass of the whole building, but not the Fp as that is a separate design effort.