2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS 2.5 SPECIAL STRUCTURES The strength, stiffness, light weight, precise dimensions, large range of sizes, free forms of LVL-C members and easy machining of LVL are advantages that can be utilized in many special structures. LVL cords give extra capacity to nail plate trusses when longer resistance to fire is required. Visually impressive LVL trusses or portal frames can enable longer spans or maximize the interior height of a hall. Door panels and frames gain form stability and improved burglar safety from LVL components. Complex geometry and ambitious architectural designs can be realized with free-form LVL-C members that can be cut to shape as required. LVL can be used to reinforce critical parts of old structures and light engineered LVL wood structures enable facilitated extensions of existing buildings. The entire deck Keminmaan puurakenne Figure 2.78. LVL-P bottom chord for nail plate trusses for attic floors and R30 fire resistant roof structures. Figure 2.79. LVL-P bottom chord provides stiffness as a floor member of an attic truss. of a pedestrian bridge can be realized from just two LVL-C panels saving considerable site work and achieving a simple and robust bracing solution. In other applications LVL-P is used, e.g., as safe, proof-loaded scaffold planks and stiff flange members of wooden I-joists for floor systems. 2.5.1 Trusses and portal frames LVL-P bottom chords provide advantages for nail plate trusses, and the LVL-P thicknesses (42 mm in Scandinavia) match the solid wood members used in them. In attic trusses, the slim and tall LVL-P bottom chords give the rigidity needed to fulfil the vibration design requirements of floor constructions. 98 LVL Handbook Europe
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