Rothoblaas - Wood screws and connectors Page 147
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STATIC VALUES CHARACTERISTIC VALUES EN 1995:2014 SLIDING timber-to-timber timber-to-timber(3) S A Sg g geometry SHEAR 45° A g S L B Sg d1 d1 L Sg A min RV,k A min Bmin RV,k [mm] [mm] [mm] [mm] [kN] [mm] [mm] [kN] 11 250 110 125 8,35 95 110 10,80 300 135 150 9,06 115 125 13,26 350 160 175 9,06 130 145 15,71 400 185 200 9,06 150 160 18,17 450 210 225 9,06 165 180 20,63 500 235 250 9,06 185 195 23,08 550 260 275 9,06 200 215 25,54 600 285 300 9,06 220 230 26,87 NOTES: GENERAL PRINCIPLES: (3) The axial resistance of the thread withdrawal was calculated considering a • Characteristic values comply with the EN 1995:2014 standard in accordance with ETA-11/0030. 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 = 385 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 | 147
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