Rothoblaas - Wood screws and connectors Página 33
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STATIC VALUES CHARACTERISTIC VALUES EN 1995:2014 SHEAR geometry timber-to-timber TENSION timber-to-timber thin steel-timber thick steel-timber with washer plate(2) plate(3) thread withdrawal(4) head head pull-through pull-through (5) with washer (5) A L b d1 b A RV,k RV,k RV,k RV,k Rax,k Rhead,k Rhead,k [mm] 80 80 80 80 80 120 120 120 120 120 120 120 120 [mm] 40 80 120 160 200 200 240 280 320 360 400 440 480 [kN] 4,87 6,00 6,00 6,00 6,00 6,00 6,00 6,00 6,00 6,00 6,00 6,00 6,00 [kN] 6,68 7,81 7,81 7,81 7,81 8,66 8,66 8,66 8,66 8,66 8,66 8,66 8,66 [kN] [kN] 9,79 9,79 9,79 9,79 9,79 11,30 11,30 11,30 11,30 11,30 11,30 11,30 11,30 [kN] 12,12 12,12 12,12 12,12 12,12 18,18 18,18 18,18 18,18 18,18 18,18 18,18 18,18 [kN] 4,88 4,88 4,88 4,88 4,88 4,88 4,88 4,88 4,88 4,88 4,88 4,88 4,88 [kN] 15,51 15,51 15,51 15,51 15,51 15,51 15,51 15,51 15,51 15,51 15,51 15,51 15,51 7,81 7,81 7,81 7,81 7,81 9,32 9,32 9,32 9,32 9,32 9,32 9,32 9,32 SPLATE = 12 mm L SPLATE = 6 mm d1 [mm] [mm] 120 160 200 240 280 320 360 12 400 440 480 520 560 600 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 = 385 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). CARPENTRY | HBS | 33
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