Inline laser cut plate steel stringer

A recurrent theme in modern design is to let the structure speak for itself, and X1 staircase stringer design is an example of how effective this can be in creating visual appeal.
Design

A recurrent theme in modern design is to let the structure speak for itself, and X1 staircase stringer design is an example of how effective this can be in creating visual appeal. The X1 is designed to create a high degree of openness and an impression of lightness. Plate steel stringers support an open tread and landing design, relying on the strength of complete laser cut section and generating a self-supporting structure.

Welded tread plates cross-brace the stringers. Continuous through the landing, this style of stringer allows for a floating appearance as it can span from the upper flight to an opposing wall or column without the need for intermediate landing supports. These design methods generate a light and open feeling, well-suited to many contemporary office layouts.

Technical

Stringers typically constructed from 200-400 x 12-200mm mild steel depending on span and load rating. Minimal plate steel dimensions that satisfy engineering requirements for design load are generally selected, reducing the bulk of the staircase and increasing the impression of lightness and openness. In some of the examples shown, the lower stringers of the upper flight continue beyond the landing to concealed columns in the wall. Regardless of the wall coverings (i.e. plaster, stone, shiplap), the penetration of blade-like plate stringers into the wall presents a highly effective and modern appearance.

This is one of the primary advantages of laser cut plate steel over other stringer types. Three alternatives for tread designs applicable to the X1 are shown. If these do not suit, a wide variety of custom tread assembly options are also possible. The X1 suits virtually any configuration of straight landings and flights: the illustrations use a particular configuration as an example.

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 Not applicable
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