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Published in:
2021 | OriginalPaper | Chapter
Stress-Strain State of the Elements of a Timber-To-Timber Joint Connected by Inclined Screwed-In Rods
Authors : T. P. Chernova, V. V. Filippov, B. V. Labudin, V. I. Melekhov
Published in: Environmental and Construction Engineering: Reality and the Future
Publisher: Springer International Publishing
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Abstract
The paper considers the stress–strain state of the timber-to-timber joint elements on inclined screwed-in rods. Experimental studies of timber-to-timber joints were performed for three types of connections: screws with anchorage details, screws, and threaded rods. The connections are established with the angle of deviation of the connecting element from the normal to the shear plane—45°.
It is found that the proposed technical solution for connecting wood elements on screws with anchorage details allows increasing the load-bearing capacity of the joints and reducing their deformability. The threaded rods joint has a greater deformability than the screw joint and a lower load-bearing capacity. The load-bearing capacity of joints with screws with anchorage details and threaded rods increases with increasing cross-section and strength of the connecting element, load-bearing capacity of the joint on screws—with increasing the washer area and anchoring length of the screws into the wood.
The destruction of joints with screws with anchorage details and threaded rods comes from crumpling of the wood under the washers (if it is not enough washer area) and rupture of the rod. It is found that the load-bearing capacity and deformability of the joints on the screws increase with increasing anchoring length of the screw.
As a result of field experiments, a calculation model is proposed for determining the load-bearing capacity of a timber-to-timber joint on inclined screwed-in rods. The load-bearing capacity of timber-to-timber joints on inclined screwed-in rods is determined from the geometric and mechanical characteristics of the wood and the joints. The calculation model takes into account the resistance of wood under the contact surface of the washer. The results of the calculation according to the developed method are compared with the results of the experiment.