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Mexico City seismic resistant design provision : issued in 1942, revised in 1957, 1976, 1985, 1987 and 1993.
The latest seismic code is “Reglamento de Construcciones para el Distrito Federal [Construction Regulations for the Federal District (1993)]” and “Normas Tecnicas Complementarias para Diseno por Sismo [Auxiliary Technical Notes for Seismic Design (1987)]”.
These codes excluding seismic coefficients and spectral accelerations are adopted in other states of Mexico as seismic codes.
Horizontal Base Shear


F : Base shear force (Fig. 2)
          W : Total weight of the building
          a  : design response spectrum (Fig. 1) 

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：
：

          T : fundamental period of vibration of the building
          c : seismic coefficient form table 1
          a0, Ta , Tb & γ : values from table 2
         Q’: the value calculated from the followings

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 :

         Q : factor depends on the type and characteristics of the structure with 1.0 to 4.0