Rothoblaas - Vijci i spojnice za drvo Page 161
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PRORAČUN VLAČNE OTPORNOSTI SPOJNOG VIJKA (EN 1995:2014 i ETA-11/0030) Rax,Rd = min Rax,α,Rk kmod γm Rtens,k γm2 ρk Rax,α,Rx = nef 11,7 d1 Sg kax 0,8 Rax,90°,Rk = 18,75 kN Rtens,k = 25,40 kN 350 Ovdje proračunate otpornosti spojnih vijaka na vlak navedene su u tablici na str. 144. Minimalne udaljenosti za postavljanje spojnih vijaka navedene su u tablici na str. 143. Italia - NTC 2018 EN 1995:2014 kmod = 0,9 kmod = 0,9 γM = 1,3 γM = 1,5 γM2 = 1,25 γM2 = 1,25 Rax,90°Rd = 12,98 kN Rax,90°Rd = 11,25 kN Rtens,d = 20,32 kN Rki,d = 20,32 kN Rax,Rd = 12,98 kN Rax,Rd = 11,25 kN MINIMALNI BROJ SPOJNIH VIJAKA Ft,90,d/Rax,Rd = 1,48 Ft,90,d/Rax,Rd = 1,70 nef,ax Pretpostavlja se uporaba 2 spojna vijka = maks. (20,9;0,9∙2)= 1,87 OTPORNOST NA VLAK OKOMIT NA SPOJ Rax,Rd = 1,87 ∙ 12,98 = 24,27 kN > 19,18 kN OK Rax,Rd = 1,87 ∙ 11,25 = 21,04 kN > 19,18 kN OK Za različite konfiguracije proračuna dostupan je softver MyProject (www.rothoblaas.com). PRIMJERI SPOJEVA ZA KOJE JE POTREBNO ISPITIVANJE NA OKOMITI VLAK I EVENTUALNO OJAČANJE ia=0 ia>0 STRUKTURE | VGZ | 161
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