9. CALCULATION EXAMPLES OF LVL STRUCTURES Screw properties Size 5,0 x 60 mm screws, 2 screws / connection Threaded length lg = 50 mm Head diameter dh = 10 mm (Head pull-through capacity is not governing in steel-to-timber connection) Tensile strength ttens,k = 7 kN determined in accordance with EN 14592. ttens,k > Ed,ULS → OK Withdrawal strength fax,k = 10 N/mm2 at the edge face of LVL 48 P, determined in accordance with EN 14592 Modification factor kmod for permanent load, SC1 = 0,6 Material safety factor γM for connections (default value in EC5) =1,3 9.6 AXIALLY LOADED SCREW CONNECTION AT THE EDGE FACE An air duct is installed to the ceiling surface of roof element. Own-weight is 50 kg/m. Suspension connections are c/c 2.5 m crosswise to roof element and the connections are made to the edge face of a 45mm thick LVL 48 P beams. Service class SC1. Loading combination The most critical ultimate limit state (ULS) load combination for the connection: Ed,ULS = s∙(γG∙gk) = 2,5 m∙(1,35∙0,5 kN/m) = 1,7 kN Note: Safety factor γG for the case of only permanent loads according to Finnish National annex of Eurocode 0. 198 LVL Handbook Europe
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