Rothoblaas - Wood screws and connectors Page 193
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STATIC VALUES CHARACTERISTIC VALUES EN 1995:2014 TENSION(1)/COMPRESSION(2) total thread withdrawal(3) geometry L steel tension partial thread withdrawal(3) Sg A Sg A instability A d1 timber d1 L b A min [mm] [mm] [mm] 100 90 13 timber steel steel Rax,k Rtens,k Rki,k [mm] [kN] [kN] [kN] 55 5,75 53,00 32,69 Rax,k Sg A min [mm] [kN] [mm] 110 14,77 35 150 140 160 22,98 60 80 9,85 200 190 210 31,19 85 105 13,95 300 280 310 45,96 135 155 22,16 400 380 410 62,38 185 205 30,37 500 480 510 78,79 235 255 38,58 600 580 610 95,21 285 305 46,78 700 680 710 111,62 335 355 54,99 800 780 810 128,04 385 405 63,20 900 880 910 144,45 435 455 71,41 1000 980 1010 160,87 485 505 79,61 1100 1080 1110 177,28 535 555 87,82 1200 1180 1210 193,70 585 605 96,03 NOTES: (1) The tensile design strength of the connector is the lower between the (3) The axial resistance of the thread to withdrawal was calculated considering timber-side design strength (Rax,d) and the steel-side design strength (Rtens,d). a 90° angle between the fibres and the connector and for a effective thread length of b or Sg. Rax,d = min Rax,k kmod γM Rtens,k γM2 For intermediate values of Sg it is possible to linearly interpolate. (2) The compression design strength of the connector is the lower between the timber-side design strength (Rax,d) and the instability design strength (Rki,k). Rax,d = min Rax,k kmod γM Rki,k γM1 STRUCTURES | VGS | 193
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