The paper presents the study of the effect of multiple cyclic humidification on the compressive strength across the grain edgewise of laminated veneer lumber (LVL), long-term sustained in conditions with high humidity. A significant decrease in its strength properties during cyclic humidification (up to 18% in three cycles) has been proved. The dynamics of crack growth due to the influence of the humidity factor is given.

Keywords: laminated veneer lumber, timber structures, strength, cyclic dampening, drying cracks, hygrostalness

The paper considers theoretical studies of the deformed state of the nagel joint with claw washers in LVL structures (from the English LVL – Laminated Veneer Lumber). A mathematical model of snow load has been developed. The method of theoretical calculations of creep from the action of periodic load on the basis of previously performed experiments is given.

Keywords: claw washer, LVL, connection, deformation, mathematical model, load, regression equation, humidity, creep