Lattice girders are three-dimensional, industrially prefabricated reinforcing elements. They consist of an upper chord and two lower chords and continuous truss wires. These are connected to the chords by means of electric resistance welding. All types of girder are available at short notice if ordered in the appropriate minimum quantities (approx. 10 t).
ADVANTAGES OF THE PRODUCT
- Secures the bonding between precast slabs and in-situ concrete in the final state
- Load-bearing capacity and serviceability of precast slab when installed
- Spacer strip for upper reinforcing element
- Perfect straightness
- Lower chords as flexural tensile reinforcement
- No diagonal projection on the upper chord side
- Ample scope of design
- Welded at all Joints
- Good transfer of shear
Lattice Girders for half slabs
This type of girder is a stocked product and therefore available at short notice.
Special girders are manufactured on individual customer demands.
DIMENSIONS, CROSS SECTIONS
STEEL CHARACTERISTICS FOR TRUSS GIRDERS ACCORDING TO ÖNORM B 4707
Girder with German Approval
The truss girders with German technical approval by DIBt include ALD truss girders for precast slabs with structural in-situ concrete layer and ALW truss girders for slab walls.
Shear Lattice Girder
Shear lattice girders are a special form of lattice girders.
The asymmetrical arrangement of the diagonals improves the shear resistance of plate structures. Shear lattice girders are used when the applied shear force exceeds the shear capacity of concrete.
In general, the lower chords are ribbed wires with a diameter of 5 mm, the upper chord is a smooth wire with a diameter of 5 mm, and the diagonals are smooth wires with a diameter of 6 mm or 7 mm. Inclination of diagonals of girders ranging from 80 mm to 140 mm (type A) is 45°. Depending on the girder height, this results in an additional horizontal section of variable length, which is parallel to the lower chord. For girders with a height of 150 mm or more (type B) this horizontal section of the diagonal wires is omitted and the inclination of the diagonals changes with the girder height. The step of diagonals is 200 mm, as it is for other lattice girders.
The height of shear lattice girders refers to the distance between the lower and upper edge of the diagonals! This differs from the definition of girder height for standard girders, which refers to the outer edges of the lower and upper chords. The length of girders ranges from 0.80 m to 7.00 m in length increments of 200 mm.
CHARACTERISTIC VALUES OF STEEL/APPROVALS