Calculation of Total Drift for One Story

δ_{x} = \frac{C_{d} \cdot δ_{xe}}{I_{e}}

δ_x	Total drift of a story [in (mm)]
C_d	Deflection amplification factor according to Table 12.2-1
δ_xe	Deflection at the location required, determined by an elastic analysis [in (mm)]
I_e	Importance factor, defined in Section 11.5.1

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