Dave Lamoureux, PE, NC CE ‘99                                                                                                
Senior Structural Engineer, Kiewit Engineering Group

Evan Gerbo
ND CEEES Ph.D student

The Arlington Memorial Bridge is a historic structure listed in the National Register of Historic Places for its significant architectural and engineering design as well as its symbolism and place within the Memorial Core of Washington, DC.  The bridge, opened to traffic in 1932, was constructed as a memorial to American patriotism and those who have died in military service to the country, as well as a symbolic representation of the reconciliation between the Union and Confederacy following the Civil War by connecting the Lincoln Memorial with Arlington House, the Robert E. Lee Memorial. The Arlington Memorial Bridge is 2,162 feet long and 94 feet wide.  The bridge consists of ten reinforced concrete arch approach spans and a double leaf bascule at the bridge’s center.  Eight of the ten approach spans convey the Potomac River under the bridge.  Two smaller concrete arches span the George Washington Memorial Parkway (GWMP) and Ohio Drive, SW at each end of the bridge. The double-leaf bascule span consists of riveted steel trusses, supported on riveted steel trunnion posts with the counterweights below the deck.  The bascule trusses support a floorbeam/stringer floor system, concrete filled grid deck, and pressed metal façade.  The main trunnions are spaced 216 feet on center.

In early 2018, the Kiewit/AECOM Design-Build Team was contracted to perform the complete rehabilitation of the bridge, including: immediate repairs on the existing bridge to keep it open to traffic, rehabilitation of all existing approach spans, piers, and abutments, and replacement of the existing bascule span.
A stand-alone shoring system has been developed and designed to facilitate a phased approach to the demolition of the existing bascule span.  This shoring system allows for splitting the span longitudinally and retaining partial traffic access throughout the life of the project.  The bascule replacement will occur concurrently with the eastbound and westbound approach spans to help minimize disruptions to the traveling public. The center piece of the stand-alone shoring system is a custom designed jack-up barge that will support half of the remaining bascule span and three lanes of public traffic.
This presentation will focus on all aspects of the project from conceptual design during estimate / bidding phase, detailed final design following contract award, and implementation of the design.

Dave Lamoureux, P.E. ND Class of 1999. Senior Structural Engineer with Kiewit Engineering Group responsible for construction engineering for some of the most complex construction challenges in North America.

Evan Gerbo, M.S., is a PhD student in the Kinetic Structures Laboratory of the Department of Civil & Environmental Engineering & Earth Sciences at the University of Notre Dame.  He interned with Kiewit Engineering Group Inc. in the Spring of 2017 under the direction of Dave Lamoureux at the Omaha, NE location.  There, he assisted in the bid of the renovation of the Arlington Memorial Bridge by constructing a SAP2000 model of the existing structure.  He is advised by Dr. Ashley Thrall, Myron and Rosemary Noble Associate Professor of Structural Engineering, and is collaborating with Ted Zoli, National Bridge Chief Engineer at HNTB Corporation, on his doctoral research.  Evan has published 4 peer-reviewed journal papers and has presented his research at several conferences.