Increasing the bearing capacity of connections on inclined screwed rods
Abstract
Increasing the bearing capacity of connections on inclined screwed rods
Incoming article date: 01.11.2020In the joints of wooden elements, obliquely screwed rods are installed in pre-drilled holes. In the absence of glue, the bearing capacity of the joint depends on the design resistance of the wood to chipping along the surface of contact with the thread of an obliquely screwed in rod. The purpose of this work is to assess the change in the bearing capacity and deformability of the joints of wooden elements on inclined screwed rods when glue is added. Samples of joints were tested on screwed-in rods, made with glue and without glue, three samples for each type of connection. It was found that the use of EPTs-1 glue increases the bearing capacity of joints on inclined screwed rods by the criterion of the breaking load by 1.33 times, by the criterion of the upper boundary of the elastic work area of the joint by 1.5 times, at the level of reaching the ultimate deformation Dult = 2 mm - 1.8 times. Full deformations Dp at the same load within the elastic work of the joints are reduced by more than 3 times. Compared to joints on glued-in rods made of periodic profile reinforcement, the consumption of glue is reduced by 6.8 times.
Keywords: connections on inclined screwed rods, glued in rods, wooden elements of composite cross-section, maximum bearing capacity, upper boundary of the elastic work area of joints, deformation of joints