2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS 2.3.3 Purlins In hall constructions LVL-P purlins are suitable secondary structures for wooden or other main frames. Since LVL is available in long lengths, multiple span purlins are structurally efficient and fast to install. However, purlins often also act as supports against lateral torsional buckling of the main frames or beams setting capacity requirements for connection detailing. Therefore single-span purlins supported with hangers from the sides of rafter beams are recommended for 3-pin frames. With the exception of flat roofs, purlins are biaxially loaded. As LVL purlins are thin, they need to be side supported in the weaker direction. Figure 2.35. Single-span and multiple span purlins for hall construction. LVL Handbook Europe 71
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