ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.
Issue link: http://www.aspiremagazinebyengineers.com/i/306849
Hampton Roads Transit (HRT) in Hampton, Va., has been planning a new-start light rail system known as The Tide since the late 1990s. In late 2006, the General Engineering Consultant (GEC) contract was awarded to the team of Parsons Brinckerhoff (PB) and URS. The team proceeded with final design of track alignments, aerial structures, trackwork, stations, a yard-and-shop building, and a variety of other components comprising this multi-discipline project. In the fall of 2007, HRT executed a Full Funding Grant Agreement with the Federal Transit Administration, which provided necessary federal funds to begin construction activities. Construction began in late 2007 and passenger revenue operations are expected to begin in 2010. The estimated total cost for the project is $288 million and the estimated ridership is 6000 to 12,000 riders per day. The Tide light rail line will extend 7.4 miles on a west-east alignment from the East Virginia Medical Center through downtown Norfolk, continuing along a former Norfolk Southern Railroad right-of- way, roughly parallel to I-264, to the city line at Newtown Road. Eleven stations will be constructed along the route with four park-and-ride locations that provide access to major areas such as Sentara Norfolk General Hospital, MacArthur Center, City Hall, Harbor Park, Tidewater Community College (Norfolk Campus), and Norfolk State University. The 7.4-mile system was divided into several different construction contracts. The first contract was awarded in late 2007. This article focuses on the precast, prestressed concrete design details that helped to produce a cost-effective structure for this section of The Tide, which is an aerial structure identified as the Lamberts/ Brambleton (L/B) Viaduct. General Viaduct Configuration The L/B Viaduct is 3011 ft long measured from abutment-to-abutment and carries eastbound and westbound tracks. The horizontal alignment is comprised of a combination of circular curves, spiral curves, and tangent sections. The sharpest curve located on-structure is profile LAMBERTS/BRAMBLETON VIADUCT / NORFOLK, VIRGINIA BRIDGE DESIGN ENGINEER: PB Americas Inc., Norfolk, Va. PILE-BENT DESIGNER FOR OPEN DECK SPANS: Simpson Engineers & Associates Inc., Cary, N.C. PRIME CONTRACTOR: Bryant Contracting Inc., Toano, Va. PRECASTER: Bayshore Concrete Products Corporation, Cape Charles, Va., a PCI-certified producer Lamberts/brambLeton viaduct Norfolk lIGHT rAIl TrANSIT ProJECT by Jason R. Doughty, PB Chorded girder layout and diaphragms in typical open deck spans. Photo: HRT. 30 | ASPIRE , Summer 2009 ASPIRE_Summer09.indb 30 6/5/09 1:54:51 PM