Acton Ostry Architects have released renderings of Brock Commons Phase 1, a 404-bed student residence at the University of British Columbia. When completed, the $51.5-million residence building will stand 53 metres tall, making it among the tallest mass timber buildings in the world.
The use of a hybrid mass wood and concrete structure was investigated to demonstrate the applicability of wood in BC’s development and construction industries. Rigorous analysis concluded that the cost of a mass timber structure was similar to that for a typical concrete or steel structure. “Advances in wood technology and manufacturing make tall wood buildings not only possible but also safe and cost effective, while providing a way to lessen the carbon footprint of the built environment,” explain the architects in a press release.
The structure is comprised of a one storey concrete podium and two concrete cores that support 17 storeys of mass timber and concrete structure. Vertical loads are carried by the timber structure while the two concrete cores provide lateral stability. The floor structure is comprised of 5-ply CLT panels that are point-supported on glulam columns on a 2.85m x 4.0m grid. This results in the CLT panels acting as a two-way slab diaphragm.
The structural concept is similar to that of a concrete flat plate slab. To avoid a vertical load transfer through the CLT panels, a steel connector allows for a direct load transfer between the columns and also provides a bearing surface for the CLT panels.
The CLT panels and glulam beams are encapsulated with gypsum board to achieve the required fire resistance rating. The roof is made up of prefabricated sections of steel beams and metal deck with the roofing membrane pre-applied to achieve quick watertightness during construction.
Edited by amor de cosmos, 09 October 2015 - 09:09 AM.