Eurotec catalogue fastening technology Page 271
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Timber engineering Static continuous load N/mm² Product Dimensions [mm] Art. no. 0,10 - 0,39 SK02 80 x 1100 945305 0,10 - 0,39 SK02 100 x 1100 945306 0,40 - 1,40 SK03 80 x 1100 945307 0,40 - 1,40 SK03 100 x 1100 945308 1,50 - 3,10 SK04 80 x 1100 945309 1,50 - 3,10 SK04 100 x 1100 945310 In the second step, the material’s natural frequency is determined; this depends on the occurring load. The values are approximately taken from the following table. 6 mm SK02 SK03 SK04 12 mm Load [N/mm²] Natural frequency [Hz] Deflection [mm] Modulus of elasticity @10 Hz Natural frequency [Hz] Deflection [mm] Modulus of elasticity @10 Hz 0,1 44 0,2 4,0 27 0,5 3,7 0,2 33 0,5 4,5 19 1,3 4,0 0,3 27 0,8 5,6 17 1,9 5,1 0,4 27 1,1 6,9 17 2,6 6,5 0,5 50 0,2 11,5 31 0,4 10,5 0,8 38 0,4 15,75 22 1,0 14,0 1,1 31 0,7 19,5 20 1,6 18,0 1,5 31 0,9 28,5 20 2,2 27,0 1,6 58 0,3 18,5 36 0,6 17,0 2,4 44 0,6 24,5 25 1,3 22,0 3,2 35 1,0 30,5 23 2,0 28,0 4,0 35 1,5 43,0 23 2,7 41,0 *Values for SK02 are based on test results provided by the University of Coimbra / Institute for Research and Technological Development in Construction Sciences. The values for SK03 and SK04 are generalised. The ongoing tests confirm the values. The results will replace the described values. As an example, the following sample calculation assumes a load of 0,3 N/mm². Our SK02 material was chosen due to the specified load. From the above table, we can see that the natural frequency must therefore be 27 Hz. We can illustrate this as follows in the graphs below. Frequency Hz SK02 Natural frequency [Hz] 50 45 40 35 27/0,3 30 25 20 15 6 mm 10 5 12,5 mm 0 25 mm 0,1 0,2 0,3 0,4 Load N/mm2 271
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