engleski

Comparison of the Eurocode 5 and Actual Croatian Codes for Wood Classification and Design with the Proposal for More Objective Way of Classification

The first part of paper is discussion about wood class system acording to EN 338 and the present system of wood classification in Croatia. According to experimental researches and the datas from the archive of the Faculty of Civil Engineering and Institutes in Croatia, wood species which is the most frequently used for elements in wood constructions in Croatia hardly belong with majority of their characteristics to unique class according EN 338. For the same values of MOE, they have bigger values of the characteristic strengths. Using values of the classes according to EN 338 wood is wasted because it is overdimensioned. For countries such as Croatia, which use Eurocode 5 as parallel code to its national but did not make their own tables of characteristic values for mechanical properties for the most used species of wood in wood construction, proposal for classification of wood members using neural network based on the results from non-destructive testings of wood samples is presented. Second part of the paper gives the differences in dimensions of the wood frame construction designed by Eurocode 5 with characteristic variable action by Croatian NAD for snow and wind load in EC1. There is a big differences in dimensions regarding the height of the place where the constructuin will be built in comparisson to differences obtained by present Croatian standards for wood element design which is economically questionable.

wood classification systems; comparison; wood grading; procedure of classifying; laboratory tests; mechanical properties; hard-wood; neural networks; mechanical resistance

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