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ACB® - Cellular steel beams with circular openings

The use of cellular beams allows a new architectural expression. Structures are lightened and spans increased, pulling spaces together. This flexibility goes together with the functionality of allowing technical installations (pipes and ducts) to pass through the openings.

The lightweight appearance of cellular beams, combined with their high strength, never ceases to inspire architects to new structural forms.

The use of ACB® cellular beams now provides effective answers to the demands of project owners. This solution allows large uninterrupted spaces over a distance of up to 18 metres and allows various pipes and ducts to be passed through the openings.

Curved or cambered cellular beams
It is easy, during fabrication, to bow the two T-sections (before welding together) to obtain curved or cambered cellular beams without great additional cost.

Asymmetric beams
Asymmetric beams are particularly suitable for composite functionality (in combination with the floor slab) and are obtained by joining T-sections of different cross sections or steel grades.

  ACB® Cellular Beam - Dimensions and Properties
  Notations and formulae

Advantages of castellated beams in roof structures:

- optimised spans of 10 to 50 m,
- increase in effectiveness of the load bearing to weight ratio,
- 25 to 30% weight savings compared with standard sections,
- lower fabrication costs than trusses,
- light weight for easy erection.

Advantages of castellated beams in slab structures:

- optimised spans of 12 to 25 m,
- increased usable ceiling height through space optimisation,
- improved flexibility, allowing distribution pipes and ducts to pass through the openings,
- reduced structure weight through asymmetric beam design

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