(For the serviceability limit state)
                      
                    

          (For the ultimate limit state)
                   
                   

The C value for the ultimate limit state shall not be taken as less than 0.025.

C_b : Basic seismic acceleration coefficients. These values shall be appropriate to the site subsoil
       category (a), (b) or (c) as defined in Table 1, and as given in parts (a), (b) and (c) respectively of
       Fig.1 and Table 2.

T₁ : The fundamental translational period on the direction under consideration

μ: Structural ductiltiy factor (See table 3)

R : Risk factor for a structure (See table 4)

Z : Zone factor (See Fig.2)

Ls : Limit state factor for the serviceability limit state (See Table.6)

Ls : Limit state factor for the ultimate limit state (See table 6)