e-mosty June 2018 American Bridges American Bridges | Page 48

For environmental and safety reasons, an in-stream
support pier was not an option. This meant the bridge
would need to comprise a single 126-metre-long
span.
Due to the challenging design criteria of a long span,
wide bridge deck, and low structural depth, structural
steel was chosen for its high strength-to-weight ratio.
The bridge structure is symmetrical along the center
of the deck section, with the two identical halves
connected at the top and bottom chords.
The site is also beneath the flight path of Calgary’s
downtown heliport. Flight path restrictions, in
combination with limitations due to the Bow River’s
100-year flood levels, squeezed the allowed structural
depth of the bridge to a maximum of only 5.85
meters.
This symmetry and repetition in design elements
allowed the bridge to be prefabricated in numerous
manufacturing facilities and assembled in a single on-
site shop.
BURGOYNE BRIDGE
The Burgoyne Bridge is a vital link in the city of St.
Catherine and since the structure was over 100 years
old, it needed to be replaced with a new structure,
with the restriction of having no disruption to traffic.
Project Team
Fabricator: Walters Group/ Canam Group
Detailer: Walters Group/ Tenca Steel Detailing, Inc.
The original structure of the Burgoyne Bridge was a
steel lattice girder and concrete deck located on the
same foundations as the new structure on the west
side.
Erector: Walters Group
Engineer: Parsons Owner: Niagara Region
General Contractor: Pomerleau
The bridge is comprised of seven continuous bays
with a total length of 380 meters including a 125-
meter and 85-ton section long arch, spanning the
Twelve Mile Creek and Highway 406.
Deck Contractor: Vixman Construction Ltd.
One of the main landmarks of the 1915 city of St.
Catherine is now history. The Niagara Region and the
City of St. Catherine wanted to replace the Burgoyne
Bridge with an aesthetic structure that could be
considered a signature, even emblematic work for the
area, while respecting the heritage aspect of the site.
The span of the arch consists of a simple lattice arch
with two trapezoidal box girders projecting from each
side and suspended steel cables on either side of the
transverse floor beams.
The six spans of the approach, ranging in length from
20 to 44 meters, are made of two trapezoidal steel
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