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ASCE 7 Cl. 12.4.2 & 12.5.4

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hveng77

hveng77

Structural
Joined
Oct 4, 2012
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GB
I am designing a steel structure in Seismic Design category E using Equivalent Lateral Force procedure. As per Cl. 12.5.4, I should consider 100% seismic load in one direction + 30% seismic load in perpendicular direction.
As per Eq. 12.4.1/12.4.2, I should also consider Ev+-Eh.
Should I apply 30% Ev while combining it with Eh, i.e. 100%Ehx + 30% Ehz + 30% Ev? Or should I consider full effect of vertical seismic load, i.e. 100%Ehx + 30% Ehz + 100% Ev?

 
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My first thought would be to use 100%Ehx + 30% Ehz + 100% Ev but I'm not near the code right now.

 
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Thanks JAE.
When you have a moment, could you pleae look into the code and let me know your views.
 
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100%. Code actually handles vertical seismic load by using a fraction of the dead load and dumping it in with dead load in the combinations (see 12.4.2.3), so should always be 100% Ev barring either of the exceptions listed in 12.4.2.2, whether you have orthogonal loading or not.
 
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Thanks MarkHirschi for your response.

Regards
H
 
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