Rothoblaas - Wood screws and connectors Page 167
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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 L b A min [mm] [mm] [mm] 80 100 120 140 160 70 90 110 130 150 5,3 5,6 timber steel Rax,k Rtens,k [mm] [kN] [kN] 45 55 65 75 85 1,79 2,51 3,23 4,17 4,93 Rax,k Sg A min [mm] [kN] [mm] 90 110 130 150 170 5,02 6,46 7,89 9,86 11,37 25 35 45 55 65 geometry 12,3 SHEAR SLIDING timber-to-timber timber-to-timber(3) S A Sg 11,0 g d1 45° A g S L B Sg d1 d1 L Sg A min RV,k A min Bmin [mm] [mm] [mm] [mm] [kN] [mm] [mm] [kN] 80 100 120 140 160 25 35 45 55 65 40 50 60 70 80 1,77 2,25 2,45 2,84 3,03 30 40 45 50 60 50 55 60 70 75 1,27 1,78 2,28 2,95 3,48 5,3 5,6 RV,k NOTES: GENERAL PRINCIPLES: (1) The connector design resistance is the lowest between the timber side de- • Characteristic values comply with the EN 1995:2014 standard in accordance with ETA-11/0030. sign resistance (Rax,d) and the steel side resistance (Rtens,d). Rax,d = min Rax,k kmod γM Rtens,k γM2 (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. • 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 mechanical resistance values and the geometry of the screws, reference was made to ETA-11/0030. • For the calculation process a timber characteristic density ρk = 420 kg/m3 has been considered. • Dimensioning and verification of the timber elements must be carried out separately. • The characteristic shear resistances are calculated for screws inserted without pre-drilling hole. In the case of screws inserted with pre-drilling hole, greater resistance values can be obtained. • The withdrawal, shear and sliding values were calculated considering the centre of gravity of the connector placed in correspondence with the shear plane. STRUCTURES | VGZ EVO FRAME | 167
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