Eurotec catalogue fastening technology Page 219
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Timber engineering KonstruX ST with cylinder head and drill point 10,0 mm: main/secondary beam joints Dimensions Main / secondary beam connection SB MB SB HSB HMB MB WSB WMB Characteristic value of the joint‘s loadbearing capacity Rk acc. to ETA-11/0024 a2= min. 50 mm, a2,c= min. 30 mm, k= min. 15 mm d1 x L [mm] min. WMB [mm] min. HSB [mm] min. WMB [mm] min. HMB [mm] m [mm] β° Rv,k a) b) - [kN] 23,67 80 44,18 140 10,0 x 300 240 120 240 106 45 63,63 180 82,44 240 23,67 80 44,18 140 10,0 x 330 260 140 260 117 45 63,63 180 82,44 240 23,67 80 44,18 140 10,0 x 360 280 140 280 127 45 63,63 180 82,44 240 23,67 80 44,18 140 10,0 x 400 300 160 300 141 45 63,63 180 82,44 240 23,67 80 44,18 140 10,0 x 450 340 180 340 159 45 63,63 180 82,44 240 23,67 80 44,18 140 10,0 x 500 380 200 380 177 45 63,63 180 82,44 240 23,67 80 44,18 140 10,0 x 550 400 220 400 194 45 63,63 180 82,44 240 23,67 80 44,18 140 10,0 x 600 440 240 440 212 45 63,63 180 82,44 240 Calculation according to ETA-11/0024. Wood density ρk= 380 kg/m³. All mechanical values provided should be viewed as subject to the assumptions that have been made and represent example calculations. All values are calculated minimum values and are subject to typographical and printing errors. a) The characteristic values of the load-bearing capacity Rk cannot be treated as equivalent to the max. possible load (the max. force). Characteristic values of the load-bearing capacity Rk should be reduced to dimensioning values Rd with regard to the usage class and class of the load duration: Rd= Rk · kmod / γM. The dimensioning values of the load-bearing capacity Rd should be contrasted with the dimensioning values of the loads (Rd ≥ Ed). Pair (n) 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 Example: Characteristic value for constant load (dead weight) Gk= 2,00 kN and variable load (e. g. snow load) Qk= 3,00 kN. kmod= 0,9. γM= 1,3. → Dimensioning value of the load Ed= 2,00 · 1,35 + 3,00 · 1,5= 7,20 kN. The load-bearing capacity of the joint is therefore considered to have been demonstrated if Rd ≥ Ed. → min Rk= Rd · γM / kmod i.e. the characteristic minimum value is calculated based on: min Rk= Rd · γM / kmod → Rk= 7,20 kN · 1,3/0,9= 10,40 kN → comparison with table values. b) estimated with an efficient quantity of pairs of screws: n0,9. Please note: These are planning aids. Projects must only be calculated by authorised persons. 219
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