United States Department of Transportation
[PDF-3.36 MB]
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Edition:Final report
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Abstract:This document contains guidelines for the seismic retrofitting of highway bridges. The guidelines are the recommendations of a team of nationally recognized experts, which includes consulting engineers, academicians, state highway engineers, and federal agency representatives from throughout the United States. The guidelines are comprehensive in nature and embody several new concepts. An extensive commentary documenting the basis for the guidelines and a worked example problem illustrating their use are included. The guidelines include a preliminary screening procedure, methods for evaluating an existing bridge in detail, and potential retrofitting measures for the most common seismic deficiencies. The preliminary screening procedures are used to identify bridges that are the most likely candidates for retrofitting. The methods for evaluating an existing bridge in detail involve the calculation of seismic capacity/demand ratios for each potentially vulnerable bridge component, overall assessment of the consequences of a design earthquake at the bridge site, and selection of the most appropriate retrofitting scheme for the bridge. Retrofitting schemes may be selected from among those presented and discussed in the guidelines. These guidelines utilize many of the concepts presented in the "Seismic Design Guidelines for Highway Bridges" (Report No. FHWA/RD-81/081) and are intended to be used in conjunction with that document.
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