Seismic Load Effects
Seismic Load Effects
(OP)
In the Seismic Load Effects equation (ASCE 7-02 eq. 9.5.2.7-1)
E = rho Q(sub E) + .2 S(sub DS) D
From a number crunching standpoint, for a steel frame building (standard AISC double angle connections for typical beam to column connections) with X-bracing located symmetrically around the perimeter of the structure, can the HORIZONTAL component of the Seismic force (rho Q(sub E))generate a vertical load in an interior column which supports only gravity loads and is not part of any of the braced frames?
I would think NO.
All of the examples that I have access to however, calculate a vertical load from the horizontal seismic force but they always utilize moment frames in the example.
Any thoughts would be appreciated.
E = rho Q(sub E) + .2 S(sub DS) D
From a number crunching standpoint, for a steel frame building (standard AISC double angle connections for typical beam to column connections) with X-bracing located symmetrically around the perimeter of the structure, can the HORIZONTAL component of the Seismic force (rho Q(sub E))generate a vertical load in an interior column which supports only gravity loads and is not part of any of the braced frames?
I would think NO.
All of the examples that I have access to however, calculate a vertical load from the horizontal seismic force but they always utilize moment frames in the example.
Any thoughts would be appreciated.






RE: Seismic Load Effects
I'm with you. It shouldn't give you a vertical component if it's not vertically braced. I could be wrong. Wouldn't be the first time.
Chip
RE: Seismic Load Effects
It is not a code issue but an analysis one.
RE: Seismic Load Effects
Because you are seeing vertical reactions in the moment frame examples? Not sure why you posted the question.