Page 148 - Dynamic Loading and Design of Structures
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Figure 4.6 Development of the design spectrum on the basis of seismic hazard analysis for PGA
(EERI, 1989).
corresponding magnitude M , from an attenuation relationship (see Figure 4.6, top right) and
i
then obtain the annual frequency Ni of earthquake with magnitude ≥Mi by substituting Mi, in
the magnitude frequency eqn (4.7). The calculated value of Ni, is then substituted in equation
(4.8) to find the corresponding
