KF Aerospace Centre for Excellence Spiral Staircase, Canada

Structures Analysed with Dlubal Software

  • Customer Project

Customer Project

A unique and extraordinary spiral staircase has been constructed in the KF Aerospace Centre for Excellence in Kelowna, BC, Canada. The staircase utilizes a special application of timber concrete composite (TCC) and includes a spiral clear span of 70 ft and a height of 23 ft.

Owner KF Aerospace
Architect Meiklejohn Architects
General Contractor Sawchuk Developments
Structural Analysis and Construction StructureCraft
www.structurecraft.com

Stair and Substructure Model Data

Model

Dlubal customer StructureCraft was responsible for the structural design and construction of this project. RFEM was used for the structural analysis.

Structure

For KF Aerospace, StructureCraft’s engineers were presented with a unique and challenging design concept: connect two levels of the museum with a free-standing spiral CLT staircase. The spiral shape requires bending and twisting of the cross-laminated timber elements, which creates both bending about the strong and weak axes and torsional forces. This not only added complexity to the manufacturing process but also susceptibility to dynamic excitation, which typically governs the design of stair structures.

Using a special application of timber concrete composite (TCC), the spiral staircase was designed using double-curved cross-laminated timber with a concrete topping. The concrete provides the additional required mass to control vibrations over the staircase 70 ft clear span. Additionally, the composite action between the concrete and the cross-laminated timber significantly increases the overall stiffness. Support columns were therefore not required maintaining a highly aesthetic structure.

Design in RFEM

RFEM was used to determine the internal forces of the TCC system. Features like the diagrammatic input of spring stiffnesses and the adjustability of certain material properties for selected load cases helped to estimate the long-term behavior and creep deformation of the TCC system. The add on RF-Laminate helped furthermore to determine the bending and shear stresses in each layer of the customized CLT buildup.

Project Location

5800 Lapointe Drive, Kelowna International Airport (YLW)
Kelowna, BC, Canada

Keywords

Staircase Spiral staircase Cross-laminated timber CLT Timber Concrete Timber concrete composite

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