Civil Engineering Association

Design, Analysis, and Seismic Performance of a Hypothetical Seismically Isolated Bridge on Legacy Highway

In this project, we examine the use of seismic isolation as an alternative to conventional approaches to achieve high seismic performance in typical highway bridges. A highway bridge designed and built in 2006 by the Utah Department of Transportation (UDOT) was chosen as a case study. This three-span, pre-stressed concrete girder bridge is located on State Street in Farmington, Utah, and crosses Legacy Highway. In this report, we present 1) proposed configuration changes to incorporate seismic isolation into the Legacy Bridge; 2) proposed modified designs of the columns and foundation system that provide significant savings in materials and construction costs; and 3) example designs for three different types of isolation devices available in the United States.

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