Kostroma state University (Department of logging and wood processing industries, department chair)
from 01.01.2016 to 01.01.2019
Kostroma, Kostroma, Russian Federation
Kostroma, Kostroma, Russian Federation
Kostroma, Kostroma, Russian Federation
Kostroma, Kostroma, Russian Federation
UDK 691.11 Лесоматериалы. Древесина и изделия из нее
UDK 694.14 Устройство соединений и креплений деревянных конструкций
The paper presents the results of finger joint quality assessment at the static bending in the production of wooden laminated structures. We selected the softwood samples randomly. This study concerns with detecting of bending stress with load application in thirds of the plate span. This loading scheme allows us to make pure bending deformation for the area under study. 53.3% of the selected samples had the values of maximum bending stress satisfying the regulatory requirements. The average value of the destructive bending stress in the finger joint was 19.8 MPa, the coefficient of variation - 8.9%. According to the study results, surface defects and the glue application uniformity on surface of the joint significantly affected the strength of finger joints. This explains the insufficient adhesive strength in the place of finger joint and, as a consequence, low strength at static bending. Therefore, it is necessary to replace glue-bearing applicators, and control the technological process of wooden laminated structures manufacturing regularly.
wooden laminated constructions, wooden housing construction, finger joint, static bending strength
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