Alignment Special Structures for Vancouver's ALRTby Brian E. Garrett, ABAM Engineers Inc, WA, USA,
Bruce I. Ostbo, ABAM Engineers Inc, WA, USA,
Abstract: This paper describes the special long-span structures, offset columns, and bent structures used in situations where the standardized guideway components used in over 90 percent of the guideway were inappropriate. The long-span structure consists of a three-span structure arranged so that the precast center span beams are cantilivered over the interior columns and are post-tensioned together in a cast-in-place crosshead. Offset column design solutions are presented for column centerline to guideway beam centerline offsets up to 5 meters, utilizing post-tensioned columns and crossheads. Bent structures, which span a roadway or other obstruction to support the guideway, are post-tensioned to optimize the section depth of the bent girder.
Subject Headings: Rail transportation | Guideways | Alignment | Bents (structural) | Concrete structures | Beam columns | Tension | Beams | North America | British Columbia | Canada | Vancouver
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