The 2008 Edition of ASCE Manual 113, Substation Structure Design Guide, devotes several sections to criteria and procedures for the seismic design of structures and components of electric substations. This paper describes concepts that interpret and supplement the seismic provisions of Manual 113. Among the issues discussed are: definition of seismic design spectra, simultaneous occurrence of ground motion in three mutually perpendicular directions, incorporation of soil-structure interaction effects and estimation of deflections under seismic loading. Numerical examples are presented to illustrate some concepts, and recommendations are given to implement them in practice.
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