高湿状态下单板层积材的横纹承压性能.

Reorganization processing is an important means to improve the structural performance of low-strength wood. This study focused on laminated veneer lumber (LVL) produced through the reorganization processing of poplar wood. Specifically, the transverse compressive properties of the full surface, local surface, and end-point local surface of LVL under high-humidity conditions were investigated from the aspects of stress mode, pressure-bearing direction, and reinforcement method. The results indicated that moisture treatment had a substantial influence on the transverse compressive performance of poplar-based LVL, with the full surface compression under wet conditions being 33% of that under dry conditions. Under similar environmental conditions, the transverse compression of LVL was primarily associated with its compression location and compression direction. During local surface compression, the pressure-bearing face received significant support from the surrounding wood fibers. Notably, the local surface compressive strength was the highest when the pressure-bearing face was parallel to the veneer layers. Under dry conditions, the compressive strength of the local surface was 1.2 times that of the end-point local surface and 1.4 times that of the full surface. The compression differed notably with varying compression directions. When the pressure-bearing face was perpendicular to the veneer layer, the LVL was susceptible to early delamination or buckling failure. Under high-humidity conditions, the higher moisture content softened the LVL, but the strong support provided by self-tapping screws helped to reinforce its compression. In conclusion, the transverse compressive strength of poplar-based LVL exhibited sensitivity to environmental humidity. Therefore, in engineering applications, it is advisable to maintain a dry environment and ensure that the pressure-bearing face is parallel to the LVL. [ABSTRACT FROM AUTHOR]