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45x
000614
2023-12-29

Stability Factor θx at Level x

θx = ∑i=xnWiRo∑i=xnFi · Δmxhs

ΣWi

Portion of the factored dead plus live load at level x determined from Sent. 4.1.8.11.(7) [3]

ΣFi

Sum of the design lateral seismic forces acting at or above level x

Ro

Overstrength-related modification factor

Δmx

Max inelastic interstory deflection defined in Sent. 4.1.8.13.(3) [3]

hs

Interstory height
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