The Travellers Sandridge Bridge Redevelopment

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The TravellersSandridge Bridge Redevelopment
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The Travellers Sandridge Bridge Redevelopment

• The Concept
• In 2001, the City of Melbourne Council held a
  competition calling for ideas to redevelop the
  existing (and disused) historic Sandridge Rail
  Bridge.
• Nadim Karam with Atelier Hapsitus proposed a
  cultural interpretation called the Travellers
  consisting of 12 large scale sculptures that move
  across the bridge. These represent a celebration
  of different historic periods of immigration to
  Melbourne.

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The Travellers Sandridge Bridge Redevelopment

• The Brief
• 10 No stainless steel sculptures (approx 7m tall
  x 5-10m wide)
• Bogie mechanism and infrastructure to facilitate
  movement of sculptures across the bridge
• 2M construction budget, 9 month delivery
  programme
• Must be delivered prior to 2006 March
  Commonwealth Games
• Arup Melbourne commissioned to provide
  structural, mechanical and cad design services.

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The Travellers Sandridge Bridge Redevelopment

• Arup Tasks
• Establish and rationalize geometries of
  sculptures using a family of parametric curves,
  working from the artists concept sketches.
• Confirm structural adequacy of proposed
  sculpture forms
• Provide information to fabricators in electronic
  format to enable fabrication.
• Develop concept design of bogies and assist
  bogie manufacturer with final detailed design.
• Develop performance based specifications for
  infrastructure installation to bridge for
  Travellers.

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The Travellers Sandridge Bridge Redevelopment

• Sculptural/ Structural Forms
• 2 No. identical planes, joined together using
  diagonal members following an arc projected from
  the planar form
• Perimeter members typically 80x80x3thk SHS
• Internal planar members typically 40 x 40 x 3thk
  SHS
• Diagonals typically 38 x 3.2thk CHS
• Orthogonal members around perimeter typically 48
  x 3.2 CHS
• Sculpture and structure one and the same

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The Travellers Sandridge Bridge Redevelopment
. Geometric Translation (1) After GSA analysis,
the iterative design cycle between GSA and Rhino
involved adjusting the geometries of single
members. This was aided by a shared coordinate
system and layering / property structure.
Overall process overview
Internal Design Cycle
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The Travellers Sandridge Bridge Redevelopment
Geometric Translation (2) Free-form spline
geometry received from the architect was
rationalized into a standard set of arcs and
straights in Rhino via an automated
routine Prior to export from Rhino, all arcs in
the model were rebuilt as a series of lines, and
all lines were checked for nodal connectivity.
Wax print and 11 steel prototypes were used to
understand the interface between geometry,
analysis and fabrication The data required
for fabrication was automatically stripped from
the 3D model using VBA and tabled as
spreadsheets. With this information, no drawings
were needed for steel fabrication.
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The Travellers Sandridge Bridge Redevelopment
Geometric Translation (3) Custom Rhino and VBA
scripts were developed to generate entities
within the 3D model, and to translate data
between different processes. The
requirements of fabrication and analysis were
used to structure the geometry generation, which
avoided later rebuilding and cleaning of the 3D
model and other translation difficulties.
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The Travellers Sandridge Bridge Redevelopment

• Structural Analysis and Design (1)
• All sections from stainless steel 316L
• Sculptures have been assessed using the
  Dallard method of buckling analysis. Typical
  buckling lambda values of order of 20. Modal
  buckling analysis used to calculate modes of
  failure and corresponding buckling load factors
  (lamda).
• Primary live load is wind loading. Effective
  solidity typically 25.

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The Travellers Sandridge Bridge Redevelopment

• Structural Analysis and Design (2)
• Natural Frequency typically gt4Hz
• Stiffness of sculpture frames derived from
  triangulation of most members and relatively
  short individual member lengths.
• Full continuity at all connections

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The Travellers Sandridge Bridge Redevelopment

• Structural Analysis and Design (3)
• GSA derived combined axial and bending stresses
  C1 and C2 used to quickly establish stress state
  within each sculpture. Allowable stresses
  reduced according to qui buckling factor.

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The Travellers Sandridge Bridge Redevelopment

• Fabrication
• Spreadsheet information and cad files fed
  directly to fabricators - Shop drawings were not
  required,
• 1 to 1 templates derived from cad files used by
  fabricators to ensure correct member fit during
  fabrication
• Tight radii formed using plate sections (8mm
  thick) which were fully welded.
• All member to member connections FSBW (TIG
  welded) All welds ground back and polished.

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The Travellers Sandridge Bridge Redevelopment

• Fixing to Bogie
• Sculptures fixed to welded platform which in
  turn is bolted to 323 dia spigot member. Spigot
  member supported by roller taper bearings at base
  (to support vertical load) and roller thrust
  bearings at top (to support horizontal loads)
• Prototype Testing
• Prototype assembly tested for static 100kNm
  moment during trial horizontal and rotational
  movement.

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The Travellers Sandridge Bridge Redevelopment

• Statistics

Total length of steelwork 3.77km Average
sculpture weight 2.3t Heaviest Sculpture
7.7t No. Steel elements 4455
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The Travellers Sandridge Bridge Redevelopment

• Opening Day

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The Travellers Sandridge Bridge Redevelopment
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The Travellers Sandridge Bridge Redevelopment