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Cd = Deflection amplification factor
Ie= Seismic importance factor
R = Response modification coefficient
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Modal Response Parameters
The value for each seismic force-related design parameter of interest, including story driftsparameters, such as story drift values, support forces, and individual member forces for each mode of response , is computed using the properties of are calculated using each mode's properties and the response spectra defined in either Section 11.4.6 or 21.2 divided by the quantity R ∕ Ie. The value for displacement and drift quantities is multiplied by the quantity Cd ∕ Ie.
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The design response spectrum is simulated of linear elastic structures. Division of The inelastic behavior of the structure is explained by dividing the spectral ordinates coordinates by the response modification coefficient, R, accounts for inelastic behavior, and multiplication of spectral ordinates . Multiplying the spectral coordinates by the Importance Factor, IeIe, provides the additional strength power needed to improve the performance of important structures. The displacements that are computed calculated using the response spectrum must be amplified by Cd and reduced by Ie to produce the expected inelastic displacements.
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