Seismic Analysis and Retrofit of the Amoskeag Bridges

by Jeffrey J. Long,
Robert H. Durfee, P.E., (A.M.ASCE),

Document Type: Proceeding Paper

Part of: Structures 2001: A Structural Engineering Odyssey


In 1983 AASHTO first offered the design guide for seismic analysis of bridges, which ultimately became a permanent part of the AASHTO Bridge Design Manual in 1990. Prior to this time, thousands of bridges had been designed and constructed without consideration of seismic forces, and the belief that a major seismic event occurring anywhere in the country other than the west coast was unlikely. Northern New England has now been identified as having a high probability for a major seismic event. The Amoskeag Bridges Rehabilitation project successfully rehabilitated an existing bridge to resist seismic forces at a fraction of the cost of a new replacement bridge. retrofit a forty year old bridge to meet current requirements.

Subject Headings: Seismic tests | Bridge design | Seismic design | Rehabilitation | Seismic effects | Bridge management | Maintenance and operation | Probability | New England | United States

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