Q_i : Lateral Seismic Shear of i-th story

Wi : weight above i-th story

C_i : Lateral Seismic Shear Coefficient of i-th story

C₀ : Standard Shear Coefficient

C₀ ≥ 0.2   for allowable stress design against moderate earthquake

C₀ ≥ 1.0   for ultimate lateral shear capacity design against severe earthquake

Z : Seismic Hazard Zoning Coefficient shown in Fig. 1

R_t : Design Spectral Coefficient shown in Fig. 2

T < TC	Rt = 1
TC ≤ T ≤ 2 TC
2TC < T

    where

             T_C : given in Table 1

              T : fundamental natural period (sec.)

A_i : Lateral Shear Distribution Factor of i-th story

α_i : α_{i  = Wi / W}
W : weight above ground level

T_c and Soil classification (see Table 1)

Design Spectral Coefficient (see Fig. 2)

2) Lateral Seismic Shear Force for