Catalogue Request

Composite steel deck for concrete slabs

DESCRIPTION

Composite Floor Slab is a mixed construction system consisting of a steel sheet which serves as shuttering for concrete and reinforces the slab, totally or partially replacing the tensile reinforcements.

The basis of this composite floor-slab system is that the various elements work together, each one contributing with its best characteristics.

It is essential to achieve a bond between the steel and concrete that is stronger than the horizontal stresses to which the slab is exposed. The behaviour under load of the composite floor slab has been analyzed following the criteria of existing standards and demonstrated experimentally in tests carried out by Official Organisations.

In this system, the concrete-steel bonding is achieved thanks to the special design of the steel sheets. These sheets are embossed with frustum-shaped projections, repeated indefinitely, both on their horizontal surfaces and on the sloping sides.

The shape and well-defined edges of these projections ensure that the concrete is perfectly anchored to the steel sheet.

 

DECKING PROFILES


ADVANTAGES


The ribbed steel profile fixed onto the framework of the building serves as a horizontal wind brace, a work platform, shuttering and flexural reinforcement of the bottom of the slab. It can, therefore, immediately contribute to wind bracing and the stability of the building due to a diaphragm effect (Eurocode 3.1.3).

The steel profiles are fixed onto the supports and serve as a work platform, thereby allowing trafficking in good working and safety conditions before the concrete is laid. Once the profiles have been installed, the underside of the floor is watertight, efficient and clean with a finished appearance. Pre-painting is possible with the exception of Cofrastra 40.

The shape of the ribs sets the steel profile securely in the concrete. The reinforcement of the Cofrastra or Cofraplus section often makes it unnecessary to have span reinforcements. All you need to do is finish off the slab with a welded mesh and possibly top bars. Without adding any extra reinforcement at the bottom, the composite floors have a half an hour firewall.

The use of mixed slab systems enables you to save in many ways :
- in the time spent on the worksite and on the use of lifting appliances
- in the weight of the concrete due to the shape of the ribbed profile, about 100 daN/m².

Reducing the weight of the slab effects the dimensioning of the rest of the structure, beams and posts that are thereby lighter and lessen the load on the foundations. The steel profiles can be manually carried and once they have been placed on the floor girders, they can be rapidly moved, which is a great asset in renovating work. There are other advantages in the use of a mixed slab system compared to the prefabricated concrete slab, such as the possibility to achieve irregular shapes, curves or special floor openings.

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