STUDY OF THE ELASTIC MODULUS OF GLUE LAMINATED BEAMS UNDER CONDITIONS OF SLANTING BENDING

Abstract

The practice of designing building structures shows that bending is one of the most common types of stress-strain state. The behavior of solid beams as well as glue laminated beams which are under the conditions of slanting bending is currently poorly known. Current rules do not take into account the peculiarities of glue laminated beams under the conditions of slanting bending. In fact, the rules do not consider the real change in the stress-strain behavior of such elements upon the load change from its initial application till fracture under the conditions of slanting bending due to the fact that material (wood) behavior in the construction is currently assumed as nominally elastic. What is more, this issue is not sufficiently studied either theoretically or experimentally.The value of the elastic modulus is one of the main characteristics in the calculations of the limiting states.

This article is devoted to the study of the working peculiarities of glue laminated beams made of glued pine boards under the conditions of slanting bending.

The article analyzes the existing studies of the elasticity modulus of wooden beams in bending. Experimental tests of wooden beams were carried out. Determination of maximum deflections and relative deformations. The article presents the results of experimental studies on the elastic modulus and deformity of glue laminated beams the conditions unsymmetrical bending.Itisdeterminedthatanincreaseintheloadonthebeamleadsto a decreaseintheelasticmodulusofthewood. Newdataonthemodulusofelasticityofglulambeamsundertheactionofobliquebendingwereobtained. The average values of the modulus of elasticity of beams according to different methods were determined.

The results will give the opportunity to design wooden constructions taking into account the profound knowledge on material capacity as well as the working peculiarities of its components, which will lead to a more practical cross section of structural components. The article will be useful for students, teachers of technical disciplines, postgraduate students, and scientists.