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Highways for LIFE

Arrow Precast Bent System for Use in High Seismic Regions - Webinar

August 18, 2011
2:30 – 4:00 PM

Accelerated Bridge Construction (ABC) techniques have the potential for saving significant time during construction of bridges, and this is particularly important in areas with high traffic volumes. Around the country, numerous projects utilizing ABC have demonstrated that such construction techniques can be valuable tools in the construction or replacement of bridges. The use of ABC in moderate to high seismic regions, however, has been limited because the requirements for seismic design of bridges and the approaches used for ABC may conflict with one another. This is because typical ABC techniques use Prefabricated Bridge Elements and Systems (PBES) and these elements are typically connected at locations where the highest seismic demands are placed on a bridge during an earthquake.

This project is deploying a precast bent or pier system that can be used in high seismic regions to connect PBES and still deliver the seismic performance that is expected and required of modern bridges. The bent system uses precast column and cap beam (crossbeam) elements that are joined into an integral unit using newly developed connection details that ensure that the seismic performance is adequate and that the service performance of the bridge is also adequate.

This session will provide a brief overview of the bent system, the testing done to validate the overall performance of the system, the design, specification and construction of a demonstration project using the bent system. The demonstration project is a replacement bridge over Interstate 5 in Washington State. The session will also provide open discussion with the developers and designers of this bent system.


  • Lee Marsh, Senior Project Manager, BergerABAM, Federal Way, WA
  • John Stanton, Professor of Civil Engineering, University of Washington, Seattle, WA
  • Bijan Khaleghi, State Bridge Design Engineer , Washington State Department of Transportation, Bridge and Structures Office, Olympia, WA

Register for Webinar:



Scott Wolf
Center for Accelerating Innovation

Updated: 07/28/2011

United States Department of Transportation - Federal Highway Administration