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Hambro Girder - Concrete Floor Systems

The composite Hambro girder is composed of a top and bottom chord, each made of two angle sections.

  • The web system consists of vertical and diagonal members.
  • The top chord S connector closes the opening between the two angle sections.
  • In addition to the S connector and where necessary for shear requirements, U-shaped channels developed specially by Hambro can be shop-installed on the girder between the Hambro joists.


Composite action between the slab and the girder
Utilizing a concrete slab in the overall design of the Hambro girder allows a better span-to-depth ratio than that of a conventional girder. Although a ratio between 24 and 27 generally represents an efficient and economical solution, a composite product can reach a ratio of up to 30.

For example, in the case of a 30-foot girder, the optimum depth is approximately 14 inches while the minimum depth is 12 inches.

Duct openings
Due to the composite design of the Hambro girder, the top and bottom chord members are smaller than those of a conventional girder. This provides for wider openings between the members.

The vertical members of the Hambro girder are aligned with the joists bearing on the top chord, maximizing the size of the openings between the diagonal members and the bottom chord.

Fire resistance rating tested to ULC and UL standards
Composite Hambro girders form an integral part of the composite Hambro floor system and therefore can reach a fire resistance rating of up to 2 hours, depending on the type of ceiling used.

Reduced number of columns
Composite Hambro girders are ideal for floors requiring long spans since fewer columns are utilized.

The optimum span of a composite Hambro girder ranges between 25 and 35 feet.

Camber designed for the dead load of wet concrete
Hambro girders and joists, designed with a camber according to the dead load of wet concrete, become level after the pour. This provides the flexibility to install the ceiling directly beneath the bottom chord in accordance with ULC and UL specifications.

Can be design to carry multiple floor loads
With a concrete slab and steel members incorporated into its design, the composite Hambro girder can be designed to carry multiple floor loads. Contact us for more information.

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