AN EXPERIMENTAL AND STATISTICAL INVESTIGATION OF DEPENDENCIES OF SOLID AND GLUED TIMBER

Abstract

In the past few decades, both in our country and abroad, buildings and structures have been constructed using wooden glued structures which can have spans of 20 to 120 m. During the design calculation of these constructions one must necessarily take into account their deformed state. In most cases, calculations are made using software, where one of the output data is the value of the modulus of elasticity of timber. Different values of internal forces in the elements of wooden constructions depend on this value. In their turn cross-sections dimensions depend on values of internal forces. That is why one of the important tasks in the design and calculation of wooden structures remains the justified choice of the modulus of elasticity value, which is also enhanced by such properties of timber as anisotropy and creep.

The article presents the results of experimental and statistical investigations of dry solid and glued timber samples, which have been investigated during compressing along the fibers. The variation of the modulus of elasticity from the beginning of loading to the destruction of wooden elements has been studied and on the basis of this the dependences   E' – η  (modulus of elasticity - stress level) have been obtained.