United States Department of Transportation
i
Design, analysis, and seismic performance of a hypothetical seismically isolated bridge on legacy highway.
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2011-01-01
[PDF-3.52 MB]
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Edition:Final report; 11/2007 - 01/2011.
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Abstract:The need to maintain the functionality of critical transportation lifelines after a large seismic event motivates the
strategy to design certain bridges for performance standards beyond the minimum required by bridge design codes.
To design a bridge to remain operational, one may stiffen and strengthen the load carrying members to increase the
capacity, or alternatively use response modification devices such as seismic isolators to shift the dynamic
characteristics of the bridge, henceforth reducing the seismic demands. Seismic isolation systems are attractive
because they are directly conducive to accelerated bridge construction techniques. The two strategies are compared
for a typical Utah highway bridge, using a three-span, pre-stressed concrete girder bridge that crosses Legacy
Highway as a case study example. The existing Legacy Bridge, which was designed as a Standard bridge for a 2500-
year return period earthquake, is evaluated as an Essential bridge for a 1000-year return period earthquake.
Subsequently, this bridge is redesigned and evaluated as a seismically isolated bridge. Configuration changes needed
to accommodate a seismic isolation system are discussed, and reductions to column and foundation elements are
proposed. Example seismic isolator designs are provided for several different types of isolation systems commonly
used in the United States. Inspection and maintenance practices for seismically isolated bridges are discussed.
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