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Code Name Regulations for Earthquake-Resistant Buildings 1988
Issued by Comision de Normas Industriales
Revision 1982, 1988
Horizontal Base Shear

The base shear force V0 is determined following the expression:

Ad = ordinate of the design spectrum defined in Section 1
W = the weight of the building including the permanent and variable loads given in  Sections 2
µ = the greatest of the values given by:

   

N = number of levels
T = fundamental period
T* = period given in Table 1
In any event the value shall not be below the minimum seismic coefficient given in Section 3

Ductility Factor
The maximum values of the ductility factor D for the different types of structures and design levels are given in Fig. 2.