Rothoblaas - Wood screws and connectors Page 75
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MINIMUM DISTANCES FOR SHEAR LOADS | LVL Load-to-grain angle α = 0° Load-to-grain angle α = 90° SCREWS INSERTED WITHOUT PRE-DRILLING HOLE [mm] [mm] [mm] [mm] [mm] [mm] [mm] d1 a1 a2 a3,t a3,c a4,t a4,c 12∙d 5∙d 15∙d 10∙d 5∙d 5∙d 6 8 10 72 30 90 60 30 30 96 40 120 80 40 40 120 50 150 100 50 50 SCREWS INSERTED WITHOUT PRE-DRILLING HOLE 5∙d 5∙d 10∙d 10∙d 10∙d 5∙d 6 8 10 30 30 60 60 60 30 40 40 80 80 80 40 50 50 100 100 100 50 d = nominal screw diameter a4,c a4,t α a2 F F α a1 F a2 a2 α α F a3,t a1 a3,c NOTES: • The minimum distances are compliant with ETA-11/0030 and are to be considered valid unless otherwise specified in the technical documents for the LVL panels. • The minimum distances are applicable when using both parallel and cross grain LVL. • The minimum distances without pre-drilling hole are valid for minimum thickness of LVL elements tmin: where: t 1 is the thickness in mm of the LVL element in a connection with 2 wooden elements. For connections with 3 or more elements, t 1 represents the thickness of the most external LVL; t 2 is the thickness in mm of the central element in a connection with 3 or more elements. t1 ≥ 8,4 d -9 t2 ≥ 11,4 d 75 CARPENTRY | TBS | 75
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