2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS 2.5.7 Bent and curved structures LVL boards and panels can be bent in the flatwise direction to form curved structures when the bending and shear stress is taken into account in the design. Unless otherwise specified in more detail, LVL-P boards and LVL-C panels can be bent in the grain direction of the surface veneer according to the following specifications: • Radius of curvature R ≥ 450 x panel thickness • Bending only in the grain direction of the surface veneer Unless otherwise specified more in detail, LVL-C panels can also be bent flatwise perpendicular to the grain direction of the surface veneer according to the following specifications: • Radius of curvature R perpendicular to surface veneer grain direction ≥ 350 x panel thickness • Bending only perpendicular to the grain direction of surface veneer Figure 2.90. LVL panels bent flatwise in parallel to grain direction (left) and perpendicular to grain direction (right). As the cross veneers of LVL-C reinforce the product in the panel width direction, it can be cut to various shapes and used as the load-bearing structure of ambitious architectural designs or to create unique interiors. When production series are small and unique, CNC machining the shapes from panels is an economical solution. In structural design, strength properties at an angle to the grain must be taken into account according to the instructions given in subsections 4.3.6-7 or according to the LVL supplier’s instructions. 104 LVL Handbook Europe
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