Rothoblaas - Wood screws and connectors Page 195
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STATIC VALUES CHARACTERISTIC VALUES EN 1995:2014 SLIDING(4) SHEAR timber-to-timber(5) timber-to-timber S A Sg g geometry 45° steel-to-timber(5) A 45° g S g S L Amin B Sg d1 timber d1 L Sg A min [mm] [mm] [mm] 100 35 13 RV,k A min Bmin [mm] [kN] [mm] 50 4,87 45 timber steel RV,k Rtens,k 45°(6) [mm] [kN] [kN] 75 9,29 RV,k Sg A min [mm] [kN] [mm] 55 4,06 80 150 60 75 7,61 60 75 6,96 130 110 15,09 200 85 100 9,46 80 90 9,87 180 145 20,89 300 135 150 11,51 115 125 15,67 280 220 32,50 400 185 200 11,94 150 160 21,47 380 290 44,11 500 235 250 11,94 185 195 27,28 480 360 55,71 600 285 300 11,94 220 230 33,08 580 430 67,32 700 335 350 11,94 255 265 38,88 - - - 800 385 400 11,94 290 305 44,69 - - - 900 435 450 11,94 325 340 50,49 - - - 1000 485 500 11,94 360 375 56,30 - - - 1100 535 550 11,94 395 410 62,10 - - - 1200 585 600 11,94 430 445 67,90 - - - 37,48 NOTES: GENERAL PRINCIPLES: (4) The axial thread withdrawal resistance was calculated considering a 45° angle • Characteristic values comply with the EN 1995:2014 standard in accordance with ETA-11/0030. between the fibres and the connector and for an effective thread length of Sg. (5) The design sliding resistance of the connector is either the timber-side de- sign resistance (RV,d) and the steel design resistance (Rtens,d 45°), whichever is lower. RV,d = min RV,k kmod γM Rtens,k 45° γM2 To properly create the joint, the head of the connector must be completely inserted in the steel plate. (6) The connector tensile strength was calculated considering a 45° angle be- tween the fibres and the connector. • 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 timber elements and steel plates 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 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. STRUCTURES | VGS | 195
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