question about 1997 ubc

huangyhg

question about 1997 ubc
i am trying to calculate a non-structural component seismic anchorage. the 1997 ubc says "forces shall be applied in the horizontal directions". does it mean the fp needs to apply to both x and y directions or should i just pick one worst case, like smaller dimension direction?
i appreciate your help.
hong
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seismic is in all horizontal directions.  in most cases, you can select the two primary (x and y) directions, but you cannot ignore any if they might control the design.
thank you jae for your response.
i guess the answer is to apply fp(calculated from formula 32-1) to any direction that will result worst condition for anchors.  it might be more correct to combine fp in two orthogonal directions on a srss basis.  but i see no one does that. the code did say to use 100% of force in one direction and 30% of force in the other direction, but i don't know if it applies to non-structural component calculations.
i would think you would see plenty of engineers combining accellerations in two directions. maybe looking the wrong direction. i think the basis of some of the load combinations consider 3 directions.
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