Pitt River Cable-stayed Bridge: Design and Construction

Date: March 23, 2013

Presenter: Craig Schaper, P.Eng., C.Eng., MIStructE
Senior Bridge Engineer, Associated Engineering (B.C.) Ltd.

The Pitt River Cable Stayed Bridge was one of the first crucial links to be implemented in the Gateway network. As part of a design-build project, this 506 m continuous river bridge included approach spans and a 380 m cable-stayed portion with a 190 m central span. The 40 m wide bridge required a unique stay arrangement of three cable planes. Other design challenges included a continuous lateral system for redistribution of seismic and ship impact loading, a shallow stay-support deck system, a complex response of the 3-plane stay system, and deep foundations.

This presentation touched on conceptual development, design-build value engineering considerations, and design and construction considerations. Key features of the structural system were described, such as the stay-supported shallow steel frame units and precast elements used for efficient balanced cantilever construction of the main spans, and the continuous deck diaphragm and link slabs used for the transfer of lateral loads and accommodation of bridge articulation. Observations were made on economy, schedule, and industry trends.

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