Calculation of Kerto-S roof beams according to Russian norms

Abstract

The purpose of the research was to design and calculate Kerto-S beams for roof structures with different parameters according to Russian norms and make a comparison between these results and Eurocode calculations. In addition, the task was to make a report with the diagrams of the final results. The study was commissioned by the Finnforest company.

In the theoretical part of the study the main issues were the calculations of a simple rafter beam and a main beam on two supports with different parameters according to Russian norms and regulations, using Mathcad software; drawing up diagrams with the relation between calibre of cross-sections, span lengths between supports, steps and maximum characteristic loads; making a comparison between the results from two methods of designing. The information was gathered from literature, norms, regulations, reference books, hand books, Internet and lectures.

In the empirical part of the study the main concerns were finding out the possibilities of applying the characteristic values of physical-mechanical properties of LVL material to calculations according to Russian norms and determining the values of factors for such material. The information was gathered with the help of teachers from certificates of LVL products, norms and regulations.

The final results of this thesis were the diagrams of relations between the maximum span length of the Kerto-S rafter beam and cross-section for appropriate steps; the diagrams of relation between maximum characteristic loads of the Kerto-S main beam and span lengths for appropriate cross-sections. The results can be applied to customers’ estimation of the maximum loads and span lengths of the LVL beams.