This 2-storey, 38,000 sq. ft. addition rests on top of an existing 2-storey building adding much needed classroom and laboratory space to Humber College’s North Campus. With limited land to build on and significant projected growth, Humber College chose to expand upwards, doubling the floor area of the building without having to use any additional land on campus. The existing building was constructed in1969 utilizing 48” deep, 80’ long precast concrete double tees supported on 1-storey high steel trusses spanning 80 feet in the other direction. These four (two interior and two exterior) trusses are supported by four corner core areas (stairs/washrooms), each with four steel columns and steel cross bracing.
Responding to the limitations of the existing structure, the project budget constraints and the fast track timeline for construction, RJC developed a structural steel solution. The new structural system consisted of concrete topping on metal deck with 1200mm deep open web steel joists for the 80 foot central span. The light weight floor system is supported on new 1-storey high cantilevered steel trusses that mirror the existing trusses. Existing core structures were extended and reinforced to support the additional load.