Rothoblaas - Wood screws and connectors Pagina 96
Commercieel klantenaanbod**Beste verkopers van RothoBlaas Deutschland
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STATIC VALUES CHARACTERISTIC VALUES EN 1995:2014 SHEAR thin steel-to-timber plate (1) geometry TENSION thick steel-to-timber plate (2) thread withdrawal(3) steel tension L b d1 b RV,k RV,k Rax,k Rtens,k [mm] [kN] [kN] [kN] [kN] 80 55 100 75 160 130 100 75 120 95 140 110 160 130 180 150 120 90 140 110 160 120 180 140 200 160 5,08 5,36 5,36 6,01 6,87 7,34 7,74 7,74 8,19 8,94 9,32 9,55 9,55 SPLATE = 12,0 mm SPLATE = 10,0 mm 12 95 110 SPLATE = 5,0 mm 10 120 140 SPLATE = 6,0 mm 8 4,07 4,58 SPLATE = 8,0 mm L [mm] SPLATE = 4,0 mm d1 [mm] 5,18 5,56 5,69 7,58 6,19 9,60 6,57 11,11 7,08 13,13 7,84 9,47 8,47 12,00 8,95 13,89 9,58 16,42 10,21 18,94 10,17 13,64 10,92 16,67 11,30 18,18 12,06 21,21 12,82 24,24 20,10 31,40 33,90 NOTES: (1) The shear resistance characteristics are calculated considering the case of a thin plate (SPLATE ≤ 0,5 d1). • The tensile design strength of the connector is the lower between the timber-side design strength (Rax,d) and the steel-side design strength (Rtens,d). (2) The shear resistance characteristics are calculated considering the case of a thick plate (SPLATE ≥ d1). (3) The axial thread withdrawal resistance was calculated considering a 90° an- gle between the grain and the connector and for a fixing length of b. In the case of steel-to-timber connections, generally the steel tensile strength is binding with respect to head separation or pull-through. GENERAL PRINCIPLES: • Characteristic values comply with the EN 1995:2014 standard in accordance with ETA-11/0030. • 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. 96 | HBS PLATE | CARPENTRY Rax,d = min Rax,k kmod γM Rtens,k γM2 • 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 methods, the MyProject software is available free of charge (www.rothoblaas.com).
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