United States Department of Transportation
[PDF-12.13 MB]
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Abstract:This manual is an interim revision of the Federal Highway Administration (FHWA) publication "Seismic Retrofitting Guidelines for Highway Bridges", which was published in 1983 as report number FHWA/RD-83/007. It describes an evaluation procedure for retrofitting seismically deficient highway bridges and outlines various measures to upgrade these structures. The guidance provided in this manual is comprehensive in nature and nationally applicable to bridges in different seismic zones. It includes a revised preliminary screening procedure; two methods of detailed evaluation (which include the capacity/demand ratio method and the lateral strength method); and expanded sections on retrofit measures for bearings, columns, footings, foundations, and soils. A new section on the application of seismic isolation to bridge retrofit is also included. These recommendations are generally compatible with those for the seismic design of new bridges contained in Division I-A of the American Association of State Highway and Transportation Officials (AASHTO) "Standard Specifications for Highway Bridges" and should be used in conjunction with these specifications. The manual is termed an interim revision because the subject matter is still evolving at this time. It is expected to be reissued when the results of on-going research studies are known and have been tested in field applications and demonstration projects.
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