Rothoblaas - Vijci i spojnice za drvo Page 73
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PRIMJER PRORAČUNA: SPOJ KROVNA GREDA - PODROŽNICA SA SOFTVEROM MYPROJECT SPAJANJE DRVO – DRVO/JEDAN SMIK 1 ELEMENT 1 ELEMENT 2 1 B1 = 120 mm B2 = 200 mm H1 = 160 mm H2 = 240 mm Nagib 30% (16,7°) Nagib 0% (0°) Drvo GL24h 2 2 Drvo GL24h PODACI PROJEKTA ODABIR VIJKA GEOMETRIJA SPOJA Fv,Rd = 1,89 kN TBS = 8x260 mm t 1 = 160 mm Uporabna klasa = 1 Predbušenje = ne α 1 = 0° t2 = 100 mm (duljina utiskivanja u element 2) Trajanje opterećenja = kratko α 2 = 90° PRORAČUN OTPORNOSTI NA SMIK POMOĆU SOFTVERA MYPROJECT (EN 1995:2014 i ETA-11/0030) d1 = 8,0 mm fh,1,k = 16,92 N/mm2 fh,2,k = 16,92 N/mm2 β = 1,00 My,k = 20,1 Nm Rax,Rk = min {otpornost na izvlačenje navoja; otpornost na penetraciju glave} = min {Rax,Rk ; Rhead,Rk} = 4,09 kN Rax,Rk/4 = 1,02 kN (učinak užeta) Rv,Rk = 3,71 kN k R Rv,Rd = v,Rk mod γM EN 1995:2014 kmod = 0,9 γM = 1,3 Rv,Rd = 2,56 kN > 1,89 kN OK Italia - NTC 2018 kmod = 0,9 γM = 1,5 Rv,Rd = 2,22 kN > 1,89 kN OK DRVODJELSTVO | TBS | 73
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