Stability Coefficient θ

θ = \frac{P_{x} \cdot Δ \cdot I_{e}}{V_{x} \cdot h_{sx} \cdot C_{d}}

P_x	Total vertical design load at and above level x with all load factors equal to or less than 1.0
Δ	Design story drift defined in Sec. 12.8.6 [1] occurring with V_x
I_e	Importance Factor from Sec. 11.5.1 [1]
V_x	Seismic shear force between levels x and x-1
h_sx	Story height below the level x
C_d	Deflection amplification factor given in Table 12.2-1 [1]

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