Abstract
The work of end moments and shear forces is taken as a criterion influencing the value of the limiting compressive force. It was found that the form of bifurcation of an individual element (active or passive) has a significant effect on the value of the critical parameters of stability of the entire system as a whole. A frame-rod structural system made of wood is considered. The influence of humidity on the type of bifurcation of its compressed elements (constrained or forced) and the critical parameters of stability of the system as a whole under various modes of force loading are determined. It is shown that with a change in humidity, individual elements can go from passive loss of stability to active, which will change the value of the critical force by an average of 20 %. To check the obtained analytical dependencies, experimental tests of frame-bar structures made of wood were carried out under their power static loading and variable humidity. At the same time, it was noted that the results of numerical and laboratory studies showed satisfactory agreement, on average by 95 %, which indicates the reliability of the developed methodology.
Highlights
During the operation of structures, there is a change in the values of loads acting on structural elements, as well as a change in the size of sections, a change in natural factors, etc
A review of existing studies on the stability of wooden structures under various loading conditions has shown that the issues of bifurcation of rod elements as part of structural systems made of wood in conditions of high humidity have not been sufficiently studied to date, is given in [11, 12]
The deflection and change in the length of the bar during loading were measured with an electronic deflection meter, which made it possible to study the stability of compressed elements of a frame-and-bar structural system made of wood by increasing the load
Summary
During the operation of structures, there is a change in the values of loads acting on structural elements, as well as a change in the size of sections, a change in natural factors, etc. A review of existing studies on the stability of wooden structures under various loading conditions has shown that the issues of bifurcation of rod elements as part of structural systems made of wood in conditions of high humidity have not been sufficiently studied to date, is given in [11, 12] Such studies are necessary to study the features of deformation of loaded elements of wooden structures, to solve traditional problems of safety of structural systems, and to assess the residual resource and protect the operated structural systems from progressive collapse caused by loss of stability of rod structures. The study of the deformation of elements in loaded and under conditions of increased humidity of rod structural systems made of wood is of scientific interest and practically an important research task
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