The Influence of Grading on the Reliability of Timber Structures
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In the present thesis, the influence of grading on the reliability of timber structures is analyzed. The thesis develops necessary expressions and explains methods for performing this type of analysis, and presents an analysis of a set of given data.The analysis of the given data shows that changing grading machine settings can reduce the probability of failure of a structure in where the graded timber is to be used by up to approximately 25 % at lower grades, and up to approximately 15 % at higher grades. In addition, it shows that the influence of the accuracy of the grading machine has a significantly larger impact than that of the machine settings. Comparing a grading machine with a relatively high degree of accuracy to a machine with a relatively low degree of accuracy shows that the use of the grading machine with the lower accuracy gives a probability of failure that is up to 750 % higher than that of the more accurate one.