A Comparative Study on Screw Withdrawal Strength of Solid Wood Material and Laminated Veneer Lumber
Abstract
In this study, screw withdrawal strength of solid wood material and laminated veneer lumber were determined according to TS EN 13446. Experiments were made on tangential surface and radial surface of solid wood material. Experiments were made on flatwise and edgewise directions of laminated veneer lumber. LVLs were produced from poplar and beech rotary peeled veneers using phenol formaldehyde adhesive. A half of the test samples were tested in air dried condition, and other half were tested after saturated with water. According to obtained findings, it was determined that screw withdrawal strength of the tangential surface of the solid wood materials was higher than that of radial surface. The highest screw withdrawal strength was measured on tangential surface of the beech solid wood material. The strength of laminated veneer lumber produced from poplar was higher than that of solid poplar. However, the strength of laminated veneer lumber produced from beech was lower than that of solid beech wood. In addition, the strength of all samples which were saturated with water was determined lower than that of air dried samples.
Keywords
Laminated veneer lumber,LVL,laminated wood material,screw withdrawal strength
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