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FLOORS REINFORCEMENT

Shear Stud Connector
for steel- concrete composite structures cold applied by pins

HIGH-PERFORMANCE FLOORS
COMPOSITE STEEL AND CONCRETE STRUCTURES: STATIC AND ECONOMIC ADVANTAGES

The construction of composite steel/concrete structures offers remarkable static and economic advantages. The load-bearing steel structureand the overlying concrete cast, suitably tied to each other by means of connectors, guarantee the static unity of the two different materials while enabling them to express their individual characteristics. The most evident advantages are the reduced weight of the steel structures, the lower total height of the floors, greater flexural rigidity and higher fire resistance. The "Nelson" type headedstud, welded to the beam, is the commonly adopted solution for the shear connection in composite steel/concrete structures.

A NEW FASTENING SYSTEM
In order to overcome the application difficulties associated with the welding of the studs, TECNARIA has developed a new system that consists of cold fastening the connectors using special nails. The connector consists of a headed stud inserted in asuitably shaped and stiffened base plate. Two cold-fastening nails, made of highly resistant material, passing through the plate, ensure the rigid fastening of the connector to the steel beam. The nails are punched in the means of a powder-actuated tool The TECNARIA connectors, therefore, offer a number of advantages: - The fastening operation is not affected by the surface treatment of theconnected parts (painted or coated) nor by the presence of the metal deck that lies between the base plate and the beam: these elements, on the contrary, combine to ensure structural unity. - Climatic conditions do not affect results (humidity or low temperatures) - Skilled workers not necessary. The fastening system is safe, reliable, fast and ensures precise high-quality fastening. - The work can becarried out on site without requiring costly or cumbersome equipment. The operator is fast and mobile. - The success of the fastening operation can be verified through a simple visual check. - The galvanized surfaces do not release poisonous fumes.

Main characteristics of the connector
Shank diameter 12 mm Stud height from 40 a 135 mm Minimum dimension of base plate: 38 mm Statically the shearstud connector TECNARIA has better mechanical characteristics and ductility if compared to a "Nelson" welded stud of the same shank diameter. Reduced dimensions of the connector (easily positioned on most profiled metal decking shape). Reduced deformation values for limited loads and high deformation values for high loads (ductile behaviour). The head prevents the detachment of the slab due todynamic stress or excessive deformation. Each connector is zinc plated

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APPLICATION
PRACTICAL, QUIK AND SAFE APPLICATION!
The TECNARIA connectors are very simple to install. Once the profiled decking has been positioned over the beam, the two high-resistance nails supplied with the connector are fastened in. The operation is simple, quick and safe. The nails are driven using apowder-actuated tool, with a special barrel.

Power actuated tool ITW-SPIT® (P 230)
The propulsion power is supplied by the expanding gas of a powder load inserted into the tool's magazine. Loads are supplied in disk, with various level of power.

Tool with indirect action and low velocity Weight: 4,1 kg Length: 410 mm

TECNARIA undertakes to recommend the best application method on a case-by-casebasis.

NAIL SELECTION FOR THE FOLLOWING TYPES OF STEEL*:
S 235: the connector can be supplied pre-assembled with the nails. S 275: the connector can be supplied pre-assembled with the nails S 355: the connector can be supplied separately, not pre-assembled. The non-assembled connector for rivet gun fastening applications can be used for all types of steel. The fastening operation is precisely...