The Rotman School of Management at the University of Toronto (U of T) has grown substantially over the last 12 years. Consequently, this innovative business school has outgrown its downtown space, resulting in a $91.8-million expansion project that includes construction of a new 15,004-m2 (161,500-sf) building clad with a curtain wall system incorporating ultra-high-performance concrete (UHPC).
From towering skylines and massive dams to modern bridges and centuries-old temples, concrete structures are the basis for much of civilization’s infrastructure and its physical development. Concrete is used worldwide, more than any other manufactured product—twice as much of it is used throughout the world than all other building materials combined. Each year, approximately four tonnes are used for every one of the nearly seven billion people on Earth. (This information comes from the 2009 U.S. Geological Survey).
When a reinforced concrete bridge deck is subjected to freeze-thaw cycles and de-icing salts over a number of years, the ensuing deterioration drastically reduces the structure’s service life and results in costly maintenance or early replacement. In such severe environments, high-performance concrete (HPC) is often required because of its superior strength and low permeability. Unfortunately, HPC also has a tendency to crack prematurely if not properly cured.
Concrete pavements are known for their strength, durability, and longevity. In the past, they have also been associated with a high initial price. However, in a number of lifecycle cost studies, concrete pavements prevail due to the significantly lower maintenance and rehabilitation needs.
Annex D of Canadian Standards Association (CSA) A23.3-04, Design of Concrete Structures, introduces a new and comprehensive limit states design (LSD) procedure for determining factored tension and shear resistance of both cast-in-place (CIP) anchors and pre-qualified post-installed mechanical anchors installed in cracked and uncracked concrete.
Montreal’s Hilton Garden Inn—a hotel and residential structure—has 43 floors—37 above-grade and six below-grade parking levels. With 216 hotel rooms and 211 apartments, this $67-million project was designed by local firm, Geiger+Huot Architects.
In the eternal struggle between building cost and quality, studcast systems can be potent tools. The thin-panel system provides benefits of architectural precast concrete, but reduces weight by more than 50 per cent.