Connection capacity The embedment strength of 3,1x90 mm round nail in LVL 48P and LVL 32P fh,LVL 48P,k = 0,082 ∙ ρk ∙ d-0,3 = 0,082 ∙ 480 ∙ 2,5-0,3 = 28,0 N/mm2 fh,LVL32P,k = 0,082 ∙ ρk ∙ d-0,3 = 0,082 ∙ 410 ∙ 2,5-0,3 = 23,9 N/mm2 Note: the angle β = 90° for the beam and 0° for the stud, so the simpler equation of embedment strength can be used. When the nails are produced from wire with tensile strength fu = 600 N/mm2, the characteristic value of the yield moment My,k for round nails is My,k = 0,3 ∙ fu ∙ d2,6 = 0,3 ∙ 600 ∙ (2,5)2,6 = 3410 Nmm 9. CALCULATION EXAMPLES OF LVL STRUCTURES Geometry conditions, Chapter 5, Table 5.1, Figures 5.4 and 5.5. Ledger beam thickness t1 = 51 mm = 16,4d >7d, so no predrilling is required. Pointside penetration length t2 = 90 mm - 51mm = 39 mm = 12,6d, OK Note: Usually it is recommended to have ≥12d penetration length t2. Minimum distance to unloaded edge a4,c in stud ≥ 7d = 7∙3,1 mm = 21,7 mm. Stud thickness 45 mm/2 = 22,5 mm → Nail size 3,1x90 mm is OK for the stud. Min. nail spacing a1 in stud ≥ [(7 + 8(cos α)] ∙ d = 15d = 46,5 mm Min. distance to unloaded edge of the beam a4,c ≥ 5d = 15,5 mm Min. distance to loaded edge of the beam a4,t ≥ (5 + 2∙sinα) ∙ d = 7d = 21,7 mm Maximum number of nails in the connection: 1+((h –min a_(4,c)–min a_(4,t)))/(min a_1 ) =1+((300mm-15,5mm-21,7mm))/46,5mm=6,65 → 6 nails are chosen for the connection, so that the edge distance a4,c and a4,t at the beam are 25mm and the nail spacing a1 in the stud (which is a2 in the beam) is 50 mm. 1+ (ℎ –min 4,c–min 4,t) min 1 = 1 + (300mm−15,5mm−21,7mm) 46,5mm =6,65 204 LVL Handbook Europe
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