Composite Bridges

Combining concrete and steel

Steel composite bridges ideally combine the properties of concrete and steel by compression-loading the concrete and tension-loading the steel. This is why the deck slab is concrete and the trough or webs are steel. Shear studs make the shear-resistant connection. Steel composite bridges are an economical alternative and with their low dead weight they are ideal for slender-looking structures.

Alternating sequence, 'back step'

At the construction stage, casting section by section in a special, pre-defined casting sequence with appropriate casting section limits sharply minimises the deck-slab cracking that can be caused by longitudinal tension strains (especially in the vicinity of the columns).

Super-elevations as planned

When the concrete is cast the super-elevated steel superstructure deforms to its final shape, so the forming carriage should copy these deformations. The statically flexible system of the composite forming carriage from Doka has the give that allows the formwork to deform along with the steel superstructure, so that the concrete slab lines up cleanly with the steel structure.

Formwork pre-assembly

Easy pre-assembly of large units from the safety of ground level. Then the pre-assembled units are quickly crane-lifted into position.

Get in touch

The international experience of Doka gives you pooled, concentrated knowledge for a successful project. Your contact person will help you find the best individual solution, to make your project's 'bottom line' a success, too. In short: expert specialised formwork planning with lasting benefits for your bridge construction project.