2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Imaginative Building Solutions Using Slim Framing & Slim Floors/Walls

Author
Mr. Brian Hall, Canadian Precast/Prestressed Concrete Institute (CPCI) (Presenter)
Abstract

This case study will showcase the Luxenbourg Condos in Quebec City. The three Luxenbourg condominiums are five storeys, and 8,400 square metres [90,000 square feet]. The challenge with this project was to have a slim-floor structure with long spans to facilitate two levels of underground parking. The developer also wished to have the building finished quickly to generate revenue earlier than a conventional construction system normally allows. All three condos use a Slim Frame System consisting of hollow trapezoidal-shaped beams and steel columns filled with concrete. The first challenge was floor depth: the project was limited in height and needed a shallow floor assembly. The project worked with a 250-millimetre thick [10 inches] precast concrete hollowcore floor slab, with a typical bay size of 8m x 11m [26 feet x 36 feet]. The long spans allowed for four parking stalls between each column while the shallow assembly was instrumental in meeting the height limitation.  Using a slim frame system as the edge beam around the perimeter of each floor also allowed for easy slim wall precast concrete wall system fastening.

This integrated slim wall building envelope system offered unique architectural solutions including plant-insulated wall panels with plant-installed windows and enhanced energy efficiency. The balcony solution consisted of a “T” shaped solid prestressed concrete slab for each balcony of 1.8 metres [6 feet] wide with a 0.9 metre [3 feet] cantilever. To minimize the thermal bridge, urethane foam was sprayed between the balcony slab and the floor slab, and on the underside of that part of the balcony slab within the interior living space. The corresponding top surface of the balcony slab is covered with a hydronic radiant floor heating system.

Innovation is the key to growth within the engineering and construction industries.  The severity of climate change, and its accelerating implications, continues to garner greater exposure than any other time in the past. With that comes a very evident shift in demand for imaginative solutions that will contribute to an easing of these pressures in the short and long term.  These solutions must meet the market demands for; resiliency, safety, energy efficiency, accelerated construction and of course aesthetic appeal and price. This case study highlights many ingenious building solutions to create a beautiful structure that integrates resilience, safety, energy efficiency, accelerated construction and of course aesthetic appeal along with the Lowest Total Cost of Ownership.