Abstract
In this article, the authors propose a method for assessing the residual resource by changing the geometric parameters of wooden structures. A general formula for estimating the maximum service life is presented. Then a number of special cases are considered when calculating the ultimate service life for the first group of limiting states. As a result, formulas were derived for calculating the ultimate service life for various design cases: centrally tensioned, centrally compressed, bending members, members subject to an axial force with bending. The author considered the determination of the rate of change in geometric parameters at the macrolevel (visually observed changes) and microscopic (microcracks, breaks of bonds between atoms). Formulas for determining the rate of change of geometric parameters at the macro and micro levels are proposed. The advantages and disadvantages of this method are presented. The scope of its application is indicated.
Highlights
During the operation of wooden structures, the dimensions of the cross-section of structural elements change
Let's talk about some aspects of calculating the maximum service life
The first thing that should be addressed is the presence in a number of formulas of such a value as the calculated length of the element
Summary
During the operation of wooden structures, the dimensions of the cross-section of structural elements change. The value of these dimensions will be minimal. Such a change in time in the dimensions of the cross-section of the elements occurs at a certain speed. From this it follows that other geometric characteristics of the section change. This fact can be used to determine the residual life of timber elements. The maximum service life will be determined by the formula: TTuuuuuu
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