Bridge Within a Bridge

by George A. Gessner, Marketing Representative; Steinman Boynton Gronquist & Birdsall, part of the Parsons Transportation Group, Pasadena, CA,
Jos� Jardim, P.E., Sr. Proj. Engr. and the Lisbon Site Engr.,

Serial Information: Civil Engineering—ASCE, 1998, Vol. 68, Issue 10, Pg. 44-47

Document Type: Feature article


A multinational consortium retrofitted the Tagus River suspension bridge in Lisbon, Portugal. The retrofit included widening the roadway deck from five to six lanes, installing a railroad deck between and along the lower chords of the stiffening trusses that would carry both commuter and freight trains, reinforcing the existing structure and repairing and repainting the entire bridge, all without interrupting traffic flow. The Tagus River Bridge is scheduled to open to rail traffic in early 1999.

Subject Headings: Railroad bridges | Suspension bridges | Rehabilitation | Rail transportation | Bridge decks | Traffic flow | Structure reinforcement

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