Rothoblaas - Plates and Connectors Page 555
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STATIC VALUES steel-to-timber shear(1) screw geometry SPLATE Fv SPLATE Fv Fv L b Fv d1 d1 [mm] L b [mm] [mm] SPLATE 25 40 50 60 70 SPLATE 60 80 100 5 7 21 36 46 56 66 55 75 95 Rv,k [kN] 1,5 mm 1,48 2,12 2,26 2,41 2,56 3,0 mm 2,55 3,45 4,00 2,0 mm 1,47 2,12 2,26 2,41 2,56 4,0 mm 2,73 3,55 4,12 screw geometry 2,5 mm 1,45 2,10 2,26 2,41 2,56 5,0 mm 3,13 3,82 4,36 3,0 mm 2,09 2,26 2,41 2,56 6,0 mm 3,53 4,10 4,58 4,0 mm 2,05 2,26 2,41 2,56 8,0 mm 3,86 4,38 4,79 5,0 mm 2,25 2,39 2,54 10,0 mm 3,74 4,33 4,74 6,0 mm 2,23 2,38 2,53 12,0 mm 3,62 4,29 4,70 tension(2) timber-to-timber shear A Fv L Fax b Fv d1 d1 L b A Rv,k Rax,k [mm] [mm] [mm] [mm] [kN] [kN] 25 40 50 60 70 60 80 100 21 36 46 56 66 55 75 95 15 20 25 30 25 35 45 0,93 1,04 1,15 1,27 1,74 2,09 2,37 1,23 2,11 2,69 3,28 3,86 4,50 6,14 7,78 5 7 NOTES: (1) The characteristic shear-strength value for LBS Ø5 nails has been evaluated assuming a plate thickness = S PLATE, always considering the case of thick plate according to ETA-11/0030 (S PLATE ≥ 1,5 mm). The characteristic shear-strength value for LBS Ø7 screws has been evaluated assuming a plate thickness = S PLATE , and considering the thin (S PLATE ≤ 0,5 d1), intermediate (0,5 d1 < S PLATE < d1) or thick (S PLATE ≥ d1) plate case scenario. (2) The axial thread withdrawal resistance was calculated considering a 90° angle between the grain and the connector and for a fixing length of b. The coefficients γ M 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 density ρk = 350 kg/m3 has been considered. • The values in the table are also valid for application on CLT (minimum panel thickness tCLT,min = 10·d1). • The values in the table are independent of the load-to-grain angle. GENERAL PRINCIPLES: • Dimensioning and verification of timber elements and steel plates must be carried out separately. • Characteristic values are consistent with EN 1995-1-1 and in accordance with ETA-11/0030. • The shear characteristic resistances are calculated for screws inserted without pre-drilling holes. In the case of screws inserted with pre-drilling holes, greater resistance values can be obtained. • The design values are obtained from the characteristic values as follows: Rd = Rk kmod γM • For further details please see the "Screws and connectors for timber" catalogue available on www.rothoblaas.com. SCREWS AND NAILS FOR PLATES | LBS | 555
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