2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS 2.3.2 Ridge beams LVL-P beams can be used as load-bearing main beams of ridge roofs. As LVL beams are slim, LVL ridge beams are normally multiple-member beams. Rafters can be supported on the ridge beam or they can be connected to the sides of the ridge beam with, e.g., joist hangers. Section 2.2.2 and Figure 2.10. have instructions for the nailing and screwing patterns of multiple-member LVL beams. In the case of side connections, nailing or screwing between the LVL plies must be verified case-specifically. Calculations according to EN 1995-1-1:2004+A1:2008 and its Finnish National Annex. Permanent load is 20% of the total characteristic load, the remainder is snow load. Wind load not included. Service class 1 or 2; consequences class CC2. Beam has lateral torsional buckling supports on the top surface at ≤ 1200 mm spacing and the loads are located at the lateral torsional buckling (LTB) supports. Double beams are analysed as separate beams in LTB. Support length shall be calculated separately. Net final deflection wnet,fin ≤ L/300. γM = 1,2 Does not replace project-specific structural design. Figure 2.34. Capacity table [kN/m] of single-span LVL 48 P ridge beams for predesign. Figure 2.33. LVL-P ridge beam. Due to the height/thickness ratio recommendations, LVL ridge beams are usually multiple-member beams. 0 10 20 30 40 50 60 70 80 90 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5 6,0 6,5 7,0 7,5 8,0 Characteristic load [kN/m] Span length [m] Floor main beams 45x200 45x240 45x260 45x300 45x360 51x400 63x500 75x200 75x300 75x600 0 5 10 15 20 25 30 35 40 2,0 2,5 3,0 3,5 4,0 4,5 Characterastic load [kN/m] Maximum span length [m] LVL 48 P ridge beams h = 200 - 300mm for roofs 45x200 45x240 45x260 45x300 75x200 75x300 2x45x200 2x45x240 2x45x260 2x45x300 0 5 10 15 20 25 30 35 40 45 50 55 60 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5 6,0 6,5 7,0 7,5 8,0 Characterastic load [kN/m] Maximum span length [m] LVL 48 P Ridge beams h = 360 - 600mm for roofs 45x360 51x400 63x500 75x600 2x45x360 2x51x400 2x63x500 2x75x600 35 40 LVL 48 P ridge beams h = 200 - 300mm for roofs 45x200 45x240 0 5 10 15 20 25 30 35 40 45 50 55 60 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5 6,0 6,5 7,0 7,5 8,0 Characterastic load [kN/m] Maximum span length [m] LVL 48 P Ridge beams h = 360 - 600mm for roofs 45x360 51x400 63x500 75x600 2x45x360 2x51x400 2x63x500 2x75x600 70 LVL Handbook Europe
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