RWT Plus Wien, Austria

Project: Das Raiqa

the idea

The building DAS RAIQA consists of 9 upper floors. From the fourth respectively sixth floor the wooden construction of the hotel starts. In general, the hotel rooms are planned in timber modular construction.

As a logical continuation, the floating platform on the top floor is also planned to be made of the ecological building material wood.

The ceiling above the 8th floor in the area of the suites and the roof terrace as well as the roof above the skybar and the event area on the 9th floor will be executed as a flat ceiling in timber construction. The decisive criterion for the design of the cross laminated timber floor is the serviceability in the area of the cantilever, which has cantilever lengths of up to 4.3m from the column to the edge of the floor. Due to the requirement for ceiling stiffness, cross laminated timber panels of 360mm to 520mm thickness result for this application.

The columns of the two floors could not be positioned on top of each other everywhere due to the utilization requirement and the resulting floor plans with jumping facade levels. In these cases, the column from the 9th floor has a spider as column base for load transfer into the cross laminated timber floor. A design load of up to Fslab,d = 900kN is taken from the slab and transferred to the column on the 8th floor via a spider in combination with fully threaded screws at the column head.

The punching shear load capacity of the cross laminated timber slab can be significantly increased by the system of the spider. Standardized cross laminated timber is currently regulated with a panel thickness of up to 400mm. However, by block bonding the cross laminated timber panel in accordance with EN14080, it is possible to realize higher panel thicknesses in special cases considering quality assurance.

Winner cat. Students

Hull Tyler University of Waterloo, Ontario

Project: Sullivan Innovation Center

the idea

The proposed 7-storey, tall mass timber building will be the home to state-of-the-art teaching and laboratory spaces dedicated to engineering students at the University of Waterloo.

The building aims at harmoniously combining both the academic and research facets into one multifunctional building to further nurture research in timber and sustainable construction, in order to further promote the adoption of mass timber and confront climate change with innovative new building solutions.

Multifunctional and future flexible spaces are achieved throughout by taking advantage of several novel structural solutions including Rothoblaas’ SPIDER and PILLAR flat plate system, and the long span hollowcore mass timber panels researched at Waterloo.

The building also takes advantage of the biophilic appeal to wood spaces by exposing most of the structural elements. When surrounded by natural materials occupants show many benefits to health, happiness, and learning. This can lead to increased design longevity by reducing long-term costs of upgrades, renovations, and re-designs that are often required over the lifetime of the building. Combined, these aspects will push the boundaries of what is thought possible with wood construction and position the building to serve as a model for future mixed-use academic buildings which were traditionally thought only possible with concrete or steel construction.

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