Objective: In order to provide data for the refined design on fire resistance of timber structures and the evaluation on residual bearing capacity of structural members exposed to fire, the parallel-to-grain tangential shear strength of heated wood within structural member with a large cross...

Impulse excitation is commonly used to assess wood stiffness in both scientific and industrial settings. Modes of vibration are excited by a mechanical impulse and their resonant frequencies measured to calculate elastic moduli. It is also possible to assess damping, which is an important property...

The effects of borate and glycerol impregnation of Douglas-fir heartwood prior to open-air oven thermal modification at 160-200°C for 2-4 h on wood color were measured. These materials were used to analyze the effects of modifying agents on thermal decomposition of wood by color nondestructive...

Optimal cutting conditions that result in high cutting accuracy and low power consumption are critical in lumber recovery and quality for sustainable wood manufacturing. Despite the many research on wood machining for secondary processing applications, less emphasis has been put on the challenges...

Douglas fir(Pseudotsuga menziesii) were thermally treated by heating platens at 180°C or 220°C to prepare a new type of heat-treated wood with uneven structure, so that the temperature of the wood surface reached 160°C and the temperature of the core layer was controlled within 150°C, and the...

Machining grooves into the upper surface of wooden deckboards reduces undesirable checking that develops when deckboards are exposed to weather. But profiled boards cup more than unprofiled boards. We sought a solution to this problem and hypothesized that profiling both sides of boards would...

NaClO₂-treated residues or holocellulose samples were prepared from birch and Douglas fir wood powders by repeated cycles of delignification. These delignified samples were characterized from their weight recovery ratios, neutral sugar compositions, size-exclusion chromatograms using 1% (w/v)...

Objective: This study was carried out to explore the shear bearing capacity of an oblique screw connecting steel plate and CLT joint, to explore the failure mode and force mechanisms of steel plate and CLT joints connected by self-tapping screws, and to analyze the influences of angle on shear...

High planting densities in coniferous stands usually lead to advantageous wood properties with high yields for strength graded timber in sawmills. In timber design, however, the focus is on mechanical wood properties, as structural engineers rely on the characteristic values for strength, stiffness ...

This paper proposed a methodology for monitoring the rolling shear (RS) failure of cross-laminated timber (CLT) via acoustic emission (AE) technique combined with digital image correlation (DIC) method. The RS strength of 3-layer CLT with different transverse layers (SPF dimension lumber, Douglas...