Rothoblaas - Wood screws and connectors Page 50
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STATIC VALUES CHARACTERISTIC VALUES EN 1995:2014 SHEAR geometry timber-to-timber panel-to-timber(1) TENSION thin steel-timber plate(2) thick steel-timber plate(3) thread withdrawal(4) head pull-through (5) A L b d A RV,k RV,k RV,k RV,k Rax,k Rhead,k [mm] [mm] [kN] [kN] [kN] [kN] [kN] [kN] 80 40 40 1,54 90 45 45 1,54 1,54 2,18 1,22 1,67 1,67 100 50 50 2,18 120 60 60 2,18 140 75 65 2,18 160 75 85 2,18 180 75 105 2,18 200 75 125 2,18 1,67 100 52 48 3,44 2,64 1,67 1,67 1,67 1,67 1,91 2,00 2,08 2,42 2,71 1,21 2,51 3,05 1,21 2,59 3,38 1,21 2,55 3,27 3,25 1,75 2,76 3,48 4,06 1,75 3,68 4,87 1,75 3,99 6,09 1,75 2,96 3,26 3,26 SPLATE = 6,0 mm 50 40 SPLATE = 3,0 mm 50 40 3,99 6,09 1,75 3,99 6,09 1,75 3,26 3,99 6,09 1,75 4,21 5,37 5,63 2,55 3,26 60 60 3,44 2,64 4,43 5,59 6,50 2,55 60 80 3,44 2,64 4,43 5,59 6,50 2,55 160 80 80 3,44 180 80 100 3,44 200 80 120 3,44 220 80 140 3,44 240 80 160 3,44 280 80 200 320 100 220 2,64 2,64 2,64 2,64 4,97 4,97 4,97 4,97 SPLATE = 8,0 mm 120 140 SPLATE = 4,0 mm 8 1,22 80 SPAN = 18 mm 6 1,22 100 SPAN = 22 mm 5 SPLATE = 5,0 mm b [mm] SPLATE = 2,5 mm L [mm] SPAN = 15 mm d1 6,13 8,66 2,55 6,13 8,66 2,55 6,13 8,66 2,55 6,13 8,66 2,55 6,13 8,66 2,55 2,64 4,97 3,44 2,64 4,97 6,13 8,66 2,55 3,44 2,64 5,51 6,67 10,83 2,55 NOTES: GENERAL PRINCIPLES: (1) The characteristic shear resistances are calculated considering an OSB3 or • Characteristic values comply with the EN 1995:2014 standard in accordance with ETA-11/0030. OSB4 panel, as per EN 300, or a particle board panel, as per EN 312, with thickness SPAN. (2) The shear resistance characteristics are calculated considering the case of a thin plate (SPLATE ≤ 0,5 d1). (3) The shear resistance characteristics are calculated considering the case of a thick plate (SPLATE ≥ d1). (4) The axial thread withdrawal resistance was calculated considering a 90° angle between the grain and the connector and for a fixing length of b. (5) The axial resistance to head pull-through, with and without a washer, was calculated using timber elements. In the case of steel-to-timber connections, generally the steel tensile strength is binding with respect to head separation or pull-through. • 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. • Values were calculated considering the threaded part as being completely inserted into the wood. • Sizing and verification of the timber elements, panels and steel plates must be done 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. • For different calculation configurations, the MyProject software is available (www.rothoblaas.com). 50 | HBS EVO | CARPENTRY
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