F_b : Base shear force for simplified modal response spectrum analysis
         W : Total weight of the building
         S_d(T)  : design spectrum normalized by the acceleration of gravity g (Fig. 1)
         T₁ : fundamental period of vibration of the building 

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        α : ratio of the design ground acceleration to the acceleration of gravity

         q : behavior factor

                            q₀ : basic value of the behavior factor from table 1

                            k_D : factor reflecting the ductility class from table 2

                            k_R : factor reflecting the structural regularity in elevation from table 3

                            k_W : factor reflecting the prevailing failure mode in structural systems
                                     with walls from table 4

              S, β₀, T_B, T_C & T_D : values from table 5
              k_d1 & k_d2 : values from table 6