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Listing cover image

96 Rissik Street

  • Date of Steelwork Completion
    2024-12-02
Project Type
  • Tubular
Project Team Interview Case Study
Location
Steel Profiles Used
  • Date of Steelwork Completion
    2024-12-02
  • Tonnage
    82
Metal Cladding and Roofing Overview
  • Date of Cladding Completion
    2025-03-03
  • Cladding Area Coverage (m2)
    1840
Project Overview

To create a lightweight curved roof spanning ±47.8 m, covering a 47.8 × 31.6 m courtyard, supported on tree columns. The atrium roof is 40m wide by 50m long in plan and comprises of a series of orthogonal primary and secondary 2D steel trusses. Each primary truss spans 50m in the east-west direction and is supported at 10m intervals by branching tree columns, which connect to one of four 23m long main steel columns.

The secondary trusses span between the primary trusses and at either end, cantilever over the northern and southern buildings. Horizontal in-plane bracing was incorporated to stiffen the structure and facilitate the transfer of lateral loads to the columns and existing eastern and western buildings.

Project Details
The majority of the steelwork was fabricated into 10m long sections at Tass Engineering's Factory. The truss internal tubes were laser cut by tube laser to ensure a perfect, clean fit. Once the individual roof components were fabricated, each of the four main roof quadrants were pre-assembled upside down at the workshop by means of purpose made jigs supporting the structure. The roof was pre-assembled complete with the main branch columns and main column cap plates to ensure correct alignment. The rotation between the base plate and the cap plate had to be perfect to ensure the branch columns fit snug to the gusset plates when erected. Special scribe lines, locating holes and slots were used to make sure the steelwork line up perfectly. The cap plate and gussets were laser cut with special holes and unique nibs to ensure the plates are all in the correct position.
The existing building could not carry much load. As a result, the original design of a glass roof with a thrusting design was changed to lighter ETFE cladding with a non-thrusting design. The main columns are nearly 24m long. The columns had to be made by using 2 x 12m standard lengths to shop join and weld before sending to site. The full length of tube had to be placed on specially made supports with rubber wheels perfectly lined up to ensure the tube remained straight when rolling the pipe slowly while welding. Due to the size of the column Rissik street needed to be closed for the installation of these columns.
Benefits of Steel in this Application

We could create a lightweight long span structure, with a high degree of accuracy and limited onsite connections. This resulted in an elegant steel structure which enhances the heritage building.

Annual Closure Notice

We will be closed from 12 December 2025 to 7 January 2026.

You are welcome to continue sending enquiries or membership applications, and you can still place orders online during this period. We will respond as soon as we return. Please note that any orders placed after 12 December 2025 will be fulfilled from 7 January 2026 onwards.