Rothoblaas - Wood screws and connectors Page 184
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STATIC VALUES | BEECH LVL CHARACTERISTIC VALUES EN 1995:2014 TENSION(1) steel tension total thread withdrawal(2) geometry L b A d1 LVL steel without pre-drilling hole with pre-drilling hole d1 eq. d1 L b A min Rax,k Rax,k Rtens,k [mm] [mm] [mm] [mm] [mm] [kN] [kN] [kN] 6 140 130 150 32,76 22,62 6 180 170 190 42,84 29,58 6 220 210 230 52,92 36,54 6 260 250 270 63,00 43,50 8 200 190 210 63,84 44,08 8 240 230 250 77,28 53,36 8 280 270 290 90,72 62,64 8 320 310 330 104,16 71,92 7 9 18,00 32,00 TENSION(1) steel tension partial thread withdrawal (2) geometry L b Sg A Sg A d1 LVL steel without pre-drilling hole with pre-drilling hole d1 eq. d1 L b Sg A min Rax,k Rax,k Rtens,k [mm] [mm] [mm] [mm] [mm] [mm] [kN] [kN] [kN] 6 140 130 55 75 13,86 9,57 6 180 170 75 95 18,90 13,05 6 220 210 95 115 23,94 16,53 20,01 7 9 6 260 250 115 135 28,98 8 200 190 85 105 28,56 19,72 8 240 230 105 125 35,28 24,36 8 280 270 125 145 42,00 29,00 8 320 310 145 165 48,72 33,64 18,00 32,00 NOTES: (1) The connector design resistance is the lowest between the timber side design resistance (Rax,d) and the steel side resistance (Rtens,d). Rax,d = min Rax,k kmod γM Rtens,k γM2 (2) The axial thread withdrawal resistance Rax,90,k was calculated considering a 90° angle between the grain and the connector and for a fixing length of b. 184 | VGZ HARDWOOD | STRUCTURES (3) The design sliding strength of the joint is either the timber-side design strength (R ) or the steel design strength (R ), whichever is lower. V,d tens,d 45° RV,d = min RV,k kmod γM Rtens,k 45° γM2 (4) The connector tensile strength was calculated considering a 45° angle between the fibres and the connector.
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