Eurotec Catalog Earthquake Side 2
Kommercielt kundetilbud **Top-sælgere fra Eurotec
The specialist for fastening technology EuroTec Paneltwistec 8.0 mm and Topduo in the highest “earthquake class”, S3 Fasteners may be assigned to “low-cycle ductility classes” for use in earthquake-prone areas. The classes are designated as S1, S2 or S3 in ascending order of “seismic performance”. To achieve this, the screws are bent at a specific angle alternately in up to 3 cycles. With each cycle, checks are performed to determine whether at least 80% of the mean flow torques of an unbent screw of the same type is still being achieved. If this is the case, the screws may be classified according to the respective ductility class. This means the Eurotec wood construction screws pictured below featuring nominal diameters of 6.0 to 10.0 mm (carbon steel) and 5.0 and 6.0 mm (stainless steel A2/A4) have achieved the highest class, S3. Despite their high strength these screws are ductile, meaning they are flexible enough to be bent backwards and forwards multiple times without failing due to becoming brittle. In the event of an earthquake, this increases the likelihood that, for example, a wood/wood connection would yield “softly” rather than failing suddenly. This may form the decisive factor when it comes to potential damage to life, limb and property. a) The flow torque describes the resistance of the screw to bending; in other words, the ‘bending stiffness’.
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