TIMBER-CONCRETE COMPOSITE FLOORS

Product catalog summary

Introduction
Timber-concrete composite floors using shear stud connectors with crampons offer a modern solution for strengthening and stiffening old timber floors. These floors often suffer from excessive deflections under current load requirements. By adding a thin, reinforced concrete slab over existing structures, the floors can be strengthened without the need for higher beams. This method is also applicable for new constructions and roofs.

Connector Design and Functionality
The TECNARIA dowel and crampon connectors facilitate collaboration between timber beams and concrete slabs, resulting in a structurally efficient composite structure. The concrete primarily handles compression, while the timber manages tension. This combination enhances strength, stiffness, dynamic behavior, and sound insulation. It is particularly beneficial in seismic areas for distributing horizontal forces.

Installation Procedures
TECNARIA connectors are designed for easy installation without requiring skilled labor. They can be fixed directly to beams or floorboards, with predrilling necessary for hardwood. A waterproof sheet should be placed under connectors before concrete casting. The installation process involves cutting holes in boards and placing connectors, with specific methods recommended for different floor types.

Specifications
Two types of connectors are available: BASE and MAXI. BASE connectors use a 50x50x4 mm base plate with 8 mm screws, while MAXI connectors use a 75x50x4 mm base plate with 10 mm screws. Both types have various dowel heights and screw lengths available.

Mechanical Properties
According to Eurocode 5 standards, the connectors have been tested for characteristic resistance and slip modulus. BASE connectors show resistance values of up to 19.50 kN, while MAXI connectors reach up to 24.50 kN, depending on the timber class.

Testing and Certification
TECNARIA connectors have undergone extensive testing in compliance with Eurocode 5 and other European standards. Tests have been conducted by various institutions, including the University of Padua and the University of Trieste, to evaluate both short- and long-term behavior under different conditions.

Conclusion
TECNARIA's timber-concrete composite system is a certified and patented solution that enhances the structural integrity of timber floors. It offers a practical and efficient method for modernizing existing structures and constructing new ones, with proven performance in various environmental conditions.

Catalog excerpts

TIMBER-CONCRETE COMPOSITE FLOORS Shear Stud Connectors With Crampons ®

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MODERN STRENGTHENING SYSTEMS THE SOLUTION TO A PROBLEM Old timber floors often need strengthening and stiffening as they were designed to bear moderate loads and almost always suffer from excessive deflections with respect to current requirements. To be sufficiently strong and stiff, new timber floors must be made with higher beams. In both cases, it is possible to lay a thin concrete slab, adequately reinforced and connected, over the existing structure either to strengthen and stiffen existing timber floors or to allow lower beams to be used to build new floors. The connector can also be used...

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TECNARIA CONNECTORS: APPLICATIONS Dowel and crampons connectors are very easy to install; they neither require skilled workmanship nor special site conditions. Installing them is as simple as tightening two screws! Connectors can either be fixed directly to the beam or to floorboards. A sheet of waterproof material should be laid under the connectors before casting the concrete. When working with hardwood predrilling is necessary (6 mm diameter for "BASE" connectors with 8 mm screws) 8 mm diameter holes must always be prepared for "MAXI" connectors with 10 mm diameter screws. A suitably dimensioned...

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FLOOR TYPES DOUBLE-FRAME FLOORS These drawings and other construction details can be downloaded from the Tecnaria Internet site www.tecnaria.com. SINGLE-FRAME FLOORS

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BASE connector base plate 50 x 50 x 4 mm screws Ø 8 mm Specifications: dowel connector comprising a 50x50x4 mm base plate with crampons and two holes for 8-mm diameter coach screws with tapered necks, and a 12 mm diameter zinc coated dowel, cold-swaged to the plate. Available dowel heights: 30, 40, 60, 70, 80, 105, 125, 150, 175 and 200 mm. Available screw lengths: 70, 100 and 120 mm Mechanical properties of Tecnaria Connectors according to Eurocode 5 EN1995-1-1:2008. Processing of laboratory data as Avis Technique 3/09-603 Connector Thick Strength classes of Characteristic resistance boards...

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CALCULATION SOFTWARE: a precious aid for designers Tecnaria offers designers a useful design tool: a calculation programme for rapidly dimensioning composite timber-concrete floors with dowel and crampon connectors. It can be downloaded free of charge from www.tecnaria.com A factor that must be taken into consideration when determining the size of composite timber-concrete floors is the deformability of the connection system. Both Eurocode 5 and DIN 1052 (Möhler theory) contain a method based on this hypothesis. The calculation programme developed by Tecnaria is based on the method recommended...

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