Feature truss staircase

Eliminating the traditional distinctions between stringer, handrail and stanchion, the T1 utilises a truss design for all three roles.
Design

Eliminating the traditional distinctions between stringer, handrail and stanchion, the T1 utilises a truss design for all three roles. Rather than concealing the structural members (see the T2 technical data sheet for examples of this kind of design), the T1 brings them to the fore in the form of 38 and 50mm stainless steel circular hollow sections. The geometric shapes created by the support structure are the main point of visual interest. The open nature of the exposed truss design is maximised by the use of frameless glass infill supported by A38 Arden system 'A' patch fittings (see Appendix A.1 for details).

Similar to other Arden styles, the T1 relies on a combination of materials and textures to achieve visual impact, featuring stainless steel, glass and timber. Elevated above the lower floor, and visually separate from the upper floor, the T1 is intended to present a discrete feature in its architectural context.

Technical

The T1 relies on a unique truss approach to resolving the structural support of the staircase, with 50mm CHS members carrying the main load, 38mm CHS members providing cross-bracing, and rod and tread bodies to provide further stiffening. A wide range of floor and void-edge fixings are possible, depending on the construction methods employed on the floors and walls. A typical fixing approach to concrete slab floors is shown in the illustrations.

Polish timber treads are the most common option, and Arden is able to provide a range of species from environmentally sound harvesting and recycled sources.

Compliance

Arden Architectural is a BSA licensed contractor for carpentry, joinery, glass, glazing and aluminium as well as structural metal fabrication and erection. Arden supplies a Form 16 (Licensed Contractor) on all projects. In design and construct contracts, a Form 15 (Design Engineer) certification is supplied upon request. For products and services incorporating this design element, the table below details compliance with relevant codes and standards.

Code
Title Applicability
BCA The Building Code of Australia Full compliance
AS NZS 1170.1-2002 Structural Design Actions – Permanent, imposed and other actions Full compliance
AS 1288-2006 Glass in Buildings. Selection and installation Full compliance
AS NZS 1554.1-2004 Structural steel welding - Welding of steel structures Full compliance
AS 1554.6-1994 Welding stainless steels for structural purposes Full compliance
AS NZS 4586-2004 Slip resistance classification of new pedestrian surface materials Full compliance
AS 1428.1-2001 Design for access and mobility Conditional*
AS 1657-1992 Fixed platforms, walkways, stairways and ladders. Design,
construction and installation
Full compliance

*Requires opaque risers for compliance