Rothoblaas - Wood screws and connectors Page 117
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STATIC VALUES CHARACTERISTIC VALUES EN 1995:2014 SHEAR timber-to-timber α = 0° (1) geometry timber-to-timber α = 90° (2) TENSION thin steel-timber plate(3) thick steel-timber plate(4) thread withdrawal(5) head pull-through(6) A L b d1 d1 L b(7) A RV,k RV,k RV,k RV,k Rax,k Rhead,k [mm] [mm] [mm] [mm] [kN] [kN] [kN] [kN] [kN] [kN] 48 32 8,49 6,03 6,99 11,17 7,51 8,89 60 40 10,48 7,42 8,93 13,02 9,39 8,89 120 72 48 11,43 8,46 10,87 15,10 11,26 8,89 140 84 56 12,18 9,28 12,70 16,59 13,14 8,89 90 60 12,58 9,50 12,93 16,83 14,08 8,89 96 64 12,99 9,72 13,16 17,06 15,02 8,89 180 108 72 13,86 10,20 13,63 17,53 16,89 8,89 200 120 80 14,09 10,72 220 132 88 14,09 11,26 240 144 96 14,09 11,63 260 156 104 14,09 11,63 14,10 14,57 15,04 15,51 SPLATE = 16 mm 150 160 SPLATE = 8 mm 16 80 100 18,00 18,77 8,89 18,47 20,65 8,89 18,94 22,53 8,89 19,41 24,40 8,89 280 168 112 14,09 11,63 15,98 19,88 26,28 8,89 300 180 120 14,09 11,63 16,45 20,35 28,16 8,89 320 192 128 14,09 11,63 16,92 20,82 30,04 8,89 340 204 136 14,09 11,63 17,39 21,29 31,91 8,89 360 205 * 155 14,09 11,63 17,43 21,33 32,07 8,89 380 205 * 175 14,09 11,63 17,43 21,33 32,07 8,89 400 205 * 195 14,09 11,63 17,43 21,33 32,07 8,89 NOTES: GENERAL PRINCIPLES: (1) The characteristic shear resistance values are calculated using an angle α • Characteristic values according to EN 1995:2014. between the strength and the grain of 0°. (2) The characteristic shear resistance values are calculated using an angle α between the strength and the grain of 90°. (3) The shear resistance characteristics are calculated considering the case of a thin plate (SPLATE ≤ 0,5 d1). (4) The shear resistance characteristics are calculated considering the case of a thick plate (SPLATE ≥ d1). (5) The axial thread withdrawal resistance was calculated considering a 90° an- gle between the grain and the connector and for a fixing length of b. (6) The axial resistance to head pull-through was calculated using timber ele- ments. In the case of steel-to-timber connections, generally the steel tensile strength is binding with respect to head separation or pull-through. (7) During calculation, a thread length of b = 0,6 L is used, with the exception of the measures (*). • Design values can be obtained from characteristic values as follows: Rd = Rk kmod γM The coefficients γM and kmod should be taken according to the current regulations used for the calculation. • For the calculation process a timber characteristic density ρ k = 350 kg/m3 has been considered. • Values were calculated considering the minimum threaded part as being completely inserted into the wood. • Dimensioning and verification of timber elements and steel plates must be carried out separately. • The characteristic shear resistance values are calculated for screws inserted with pre-drilling hole. CARPENTRY | KOP | 117
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