Credit Valley Hospital
Mississauga, Ontario, Canada
Client: Credit Valley Hospital
Parsons Brinckerhoff Role: Structural Engineering
Halsall (the Canadian operating company of Parsons Brinckerhoff) provided structural engineering services for a 600,000-square-foot (55,742-square-meter) expansion and 150,000-square-foot (13,936-square-meter) renovation project at Credit Valley Hospital. Facilities included the new Peel Regional Cancer Centre (housing three complete treatment bunkers and shelled-in space for three additional bunkers); an expansion to the Ambulatory Care facility; a 72-bed complex Continuing Care wing; a rehabilitation facility; a wellness center; a Maternal Child Care building; and emergency room renovations.
The 4-story structure (designed with provision for a one-story addition) is framed in structural steel, with cast-in-place concrete shear walls. The timber structure featured in public spaces—supported by curved, tree-shaped glulam columns—is up to two-and-one-half stories high, with all timber connections concealed. A new, state-of-the art-fire suppression system (three misting heads protecting each of the glulam "tree trunks") was developed and tested specifically for this project, to facilitate use of combustible structural material in this type of building. Six radiation bunkers were also constructed using heavyweight hematite concrete in critical areas, with a Cancer Survivor's Park built on the roof.
A key structural engineering challenge on this project involved creating the 2.5-story high timber structures that curve and support a roof that has considerable snowloading. Another challenge involved development of the radiation bunkers, which are constructed with concrete walls up to 5.9 feet (1.8 meters) thick, as well as a concrete slab that must remain free of cracks.