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Site Factors


See FHWA-HRT-06-032, Seismic Retrofitting Manual for Highway Structures, Part 1-Bridges, Jan 2006.

a. Fa is determined by the site class and the short-period spectral acceleration (Ss) for the upper level earthquake.

b. Fv is determined by the site class and the long-period spectral acceleration (S1) for the upper level earthquake.

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