DESIGN AND CONSTRUCTION OF ST. PATRICK'S PEDESTRIAN BRIDGE IN CALGARY

摘要

St. Patrick’s Bridge crossing the Bow River in Calgary is currently under construction and will be reachingcompletion at the time of the conference. The bridge is the result of an open international competition wonby a joint venture between RFR architects and engineers, and Halsall, now part of the Parsons Brinckerhoffgroup.The footbridge is a three-span, 182 metre long network arch structure spanning over the Bow River at thetip of St. Patrick’s Island in Calgary. The inherently efficient scheme with generous span to depth ratios wasoptimized parametrically with respect to member geometry and sizes. The slender arches and slim deckhave minimal contact with the river banks thereby responding to the openness and the natural qualities ofthe site.Several challenges were encountered during the course of the construction, the most significant of whichwas the unprecedented flooding of June 2013 that washed out critical deck falsework, and caused extensivedamage to the bridge deck and steelwork. Finally, the design itself presented certain constructionchallenges such as the sequencing of installation operations and hanger cable tensioning so that the archesand deck work together as a network arch.