2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS Calculations according to EN 1995-1-1:2004+A1:2008 and its Finnish National Annex. Permanent load is 25% of the total characteristic load, the rest is snow load. Wind load not accounted for. Service class 1 or 2; consequences class CC2. The beam has lateral torsional buckling (LTB) supports on the top surface at ≤ 600 mm spacing. Double beams are analysed as separate beams for LTB. The support length is to be calculated separately. Net final deflection wnet,fin ≤ L/300. γM = 1,2 Note: Glass openings may require a more strict deflection limit. Does not replace project-specific structural design. Figure 2.62. Capacities [kN/m] of single-span LVL 48 P lintel beams for predesign. 2.4.4 Integrated rim beams Integrated rim beams of timber frame walls are an essential and common application for LVL-P in Europe. They are installed on top of notched wall studs and carry the loads from the roof or other structures above to the studs. Since the integrated rim beams transfer the loads, the floor joist, roof rafter or roof truss spacing can be independent of the wall stud locations. Integrated rim beams simplify the structure so that separate lintels are not required except for the largest openings. In off-site production integrated rim beams are installed integrally in the wall elements. As LVL is available in long lengths, builders often use the dimensionally accurate and straight LVL-P members to align and brace the wall frame when they are assembled and to ensure that the overall dimensions of the building are correct. Similar to lintels, LVL integrated rim beams improve the building physics detailing by reducing cold bridging compared to massive beams, as there is more space for thermal insulation. LVL integrated rim beams are typically 45-51 mm thick and 200-300 mm high. Metsä Wood Figure 2.63. Integrated rim beam in timber frame wall structure. 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 Span length [m] Floor main beams 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 Characterastic load [kN/m] Maximum span length [m] LVL 48 P lintel beams h = 360 - 600mm 45x360 51x400 63x500 75x600 2x45x360 2x51x400 2x63x500 2x75x600 0 5 10 15 20 25 30 35 40 1,5 2,0 2,5 3,0 3,5 4,0 4,5 Characterastic load [kN/m] Maximum span length [m] LVL 48 P lintel beams h = 200 - 300mm 45x200 45x240 45x260 45x300 75x200 75x300 2x45x200 2x45x240 2x45x260 2x45x300 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 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5 6,0 6,5 7,0 Charactera Maximum span length [m] 0 5 10 15 20 25 30 35 40 1,5 2,0 2,5 3,0 3,5 4,0 4,5 Characterastic load [kN/m] Maximum span length [m] LVL 48 P lintel beams h = 200 - 300mm 45x200 45x240 45x260 45x300 75x200 75x300 2x45x200 2x45x240 2x45x260 2x45x300 88 LVL Handbook Europe
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