MAA Condominiums & Penthouses
Clients : Devimco Immobilier and Fonds immobilier de solidarité FTQ
Architect : LEMAYMICHAUD
The new MAA Condominium and Penthouses tower offers 33 floors of luxury residences that sit above the eponymous sports club founded in 1881. Standing 120 m (400 ft) above ground, the tower has three levels of parking built under the centuries-old facades of the North and South wings to remain on Peel Street. Part of the North facade, overlooking the alley, is also supported. The three fl oors of underground parking spaces extend beneath the existing remote Peel Street façade, thus allowing a 100% use of the site up to the lot line. The building to the South is also underpinned to allow the construction of the three new underground floors.
Since the new Sports Club fl oors do not exactly match the original building levels, discrete lateral supports have been integrated into the existing façade so as not to alter its restraint conditions. Despite the mixed program of the building requiring the use of different column spans between the residential and sports portion, the structure has only 6 transfer beams: the remainder of the span transitions was obtained via a column translation approach, which is much more economical than transfer beams and does not affect the clear height of each level.
TECHNICAL CHALLENGES :
- First, since the building includes several uses stacked atop of each other (including parking, sports center and condos), each of them requires a different column grid.
- In the sports club section, the structure must accommodate an indoor swimming pool of approximately 25 m (82 ft) in length.
- The structure must also be able to support prefabricated concrete and granite panels. Note that the majority of these panels are located at the extremity of cantilevered slabs.
- In addition, the project includes a floor of townhouses located at mid-height of the entire building and a floor of penthouses at the very top. Each of these floors is double height with slender columns.
- The greatest challenge has been the preservation of the existing masonry facades, including a portion of masonry wall within the existing building to be conserved, at the request of the Quebec Ministry of Culture and Communications. These walls had to be retained during the demolition of the existing, excavation and construction of the new MAA.
NOTABLE SOLUTIONS AND INNOVATIONS :
- In order to manage the different structural grids between uses, translations of columns have been made. For example, for a full row of columns, a translation of about 3.8 m (12 ft. 6 in.) over 4 levels in 2 steps was performed, avoiding the need for transfer beams.
- In order to reduce the thickness of the bracing walls to minimize their impact on the floor layouts, the two central cores are linked by coupling beams.
- Then, hangers and slab transfers were used in the townhouse and penthouse floors to accommodate the architectural concept.
- Finally, the preservation of the masonry walls of the existing building of the MAA Club required special consideration from all the stakeholders. A temporary exterior facade retaining system was developed and a steel pile girder system was designed to temporarily support the existing interior masonry wall. Finally, a 900 mm (36 in) thick slab was required to support this wall.