Rothoblaas - Wood screws and connectors Page 166
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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. MINIMUM DISTANCES FOR AXIAL STRESSES (2) SCREWS INSERTED WITH AND WITHOUT PRE-DRILLING HOLE d1 [mm] a1 [mm] a2 [mm] [mm] 2.5∙d 13 14 [mm] 10∙d 53 56 a2,LIM (3) a1,CG 5,3 5,6 5∙d 27 28 5∙d 27 28 a2,CG [mm] 4∙d 21 22 aCROSS [mm] 1.5∙d 8 8 d = nominal screw diameter SCREWS UNDER TENSION INSERTED WITH AN ANGLE α WITH RESPECT TO THE GRAIN a2,CG a2,CG a2,CG a2 a2,CG a2 a2,CG a2,CG a1,CG 1 a1 a a2,CG a1,CG a1,CG a2,CG a1,CG plan front plan front SCREWS INSERTED WITH α = 90° ANGLE WITH RESPECT TO THE GRAIN a2,CG a2 a2,CG a1,CG a1 a1,CG plan a1 front NOTES: (2) The minimum distances for connectors stressed axially are independent of the insertion angle of the connector and the angle of the force with respect to the grain, in accordance with ETA-11/0030. 166 | VGZ EVO FRAME | STRUCTURES (3) The axial distance a can be reduced down to 2,5 d if for each connector a 2 1 “joint surface” a1∙a2 = 25∙d1 2 is maintained.
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