The Angus L. Macdonald Bridge, a major suspension bridge that crosses Halifax Harbour in Halifax,
Nova Scotia, opened to traffic in 1955. The bridge deck has reached the end of its service life, and
the design of the new bridge superstructure and its replacement sequence were completed in
2014. The entire suspended structure and hangers are now being replaced sequentially during
night and weekend closures while the bridge is opened for traffic during the daytime. The erection
sequence is supported by sophisticated automated erection analysis models which take into
account the geometry of the existing bridge, positioning of the erection equipment on the deck,
and hanger and strand jack adjustments that are required during construction. Significant wind
tunnel testing and analysis have been performed to ensure aerodynamic stability of the bridge
during erection and in its final condition.