Rothoblaas - Wood screws and connectors Page 174
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EFFECTIVE THREAD USED IN CALCULATION 10 Sg Tol. Sg 10 b = L - 10 mm represents the entire length of the threaded part S g = (L - 10 mm - 10 mm - Tol.)/ 2 represents the partial length of the threaded part net of a laying tolerance (Tol.) of 10 mm b L The timber to timber withdrawal, shear and sliding values were calculated considering the centre of gravity of the connector placed in correspondence with the shear plane. STATIC VALUES CHARACTERISTIC VALUES EN 1995:2014 TENSION(1) total thread withdrawal(2) geometry L partial thread withdrawal(2) Sg A Sg A steel tension A d1 timber steel d1 L b A min timber Rax,k Sg A min Rax,k Rtens,k [mm] [mm] [mm] [mm] [kN] [mm] [mm] [kN] [kN] 80 70 90 5,02 25 45 1,79 5,3 100 90 110 6,46 35 55 2,51 5,6 7 9 120 110 130 7,89 45 65 3,23 140 130 150 9,86 55 75 4,17 160 150 170 11,37 65 85 4,93 140 130 150 12,32 55 75 5,21 180 170 190 16,11 75 95 7,11 220 210 230 19,90 95 115 9,00 260 250 270 23,69 115 135 10,90 300 290 310 27,48 135 155 12,79 200 190 210 23,15 85 105 10,36 240 230 250 28,02 105 125 12,79 280 270 290 32,90 125 145 15,23 320 310 330 37,77 145 165 17,67 360 350 370 42,64 165 185 20,10 11,0 12,3 15,4 25,4 NOTES: (1) The connector design resistance is the lowest between the timber side de- sign resistance (Rax,d) and the steel side resistance (Rtens,d). Rax,d = min Rax,k kmod γM Rtens,k γM2 174 | VGZ EVO | STRUCTURES (2) The axial resistance of the thread to withdrawal was calculated considering a 90° angle between the fibres and the connector and for a effective thread length of b or Sg. For intermediate values of Sg it is possible to linearly interpolate. (3) The axial resistance of the thread withdrawal was calculated considering a 45° angle between the fibres and the connector and for an effective thread length of Sg.
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