Rothoblaas - Wood screws and connectors Page 35
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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 5 6 SCREWS INSERTED WITHOUT PRE-DRILLING HOLE d1 [mm] 8 10 a1 [mm] 5 6 8 10 12∙d 60 a2 [mm] 5∙d 25 72 96 120 5∙d 25 30 40 50 30 40 50 5∙d 25 30 40 50 a3,t [mm] 15∙d 75 90 120 150 10∙d 50 60 80 100 a3,c [mm] 10∙d 50 60 80 100 10∙d 50 60 80 100 a4,t [mm] 5∙d 25 30 40 50 10∙d 50 60 80 100 a4,c [mm] 5∙d 25 30 40 50 5∙d 25 30 40 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 softwood 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 | HBS | 35
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