As a subconsultant on the Arlington Memorial Bridge design-build team, H&H led the bridge engineering services for the bascule span removal and its replacement with a fixed span. Services provided included: Stage I – Bridge Inspections, Preliminary Rehabilitation Design; Stage II – Load Ratings, Final Rehabilitation Design; Stage III – Construction Support; Additional Services; Seismic Analysis, Geotechnical Engineering, Emergency Repairs.
Arlington Memorial Bridge, located in the heart of our nation’s capital, is listed on the National Register of Historic Places. Since its opening in 1932, the bridge has only undergone minor rehabilitation. The bridge was load posted in 2015 to a 10-ton limit, indicating its deterioration. This project was the first major rehabilitation, increasing the service life by 100 years.
The new steel multi-girder fixed span bridge is comprised of three spans, two 29-foot approach spans, and a 214ft long center span. The bridge has sidewalks on each side measuring 13’-9” each, and the roadway measures 60 feet from curb to curb, providing six 10-foot-wide vehicle travel lanes. Four cast-in-place deck arch spans are on each approach leading up to the new center span. The arch approach spans range from 166 feet to 180 feet from springline to springline.
Prior to removal, the double-leaf bascule span consisted of riveted steel trusses supported on riveted steel trunnion posts with counterweights below the deck. The bascule trusses supported a floorbeam/stringer floor system and concrete-filled grid deck. At the time of original construction, the bascule span was one of the heaviest built. The main trunnions were spaced 214 feet on center, with a 29ft long deck over a counterweight fixed span at the bascule pier.