Abstract
The article presents the testing designating the impact of structural non-uniformity on the effectiveness of reinforcing bent wooden beams reinforced with basalt fibre (BFRP—Basalt Fibre Reinforced Polymers) rods. The obtained results demonstrate a positive impact of the strengthening in improving the bearing capacity and rigidness of the wooden beams. The article presents the impact of selected physical and chemical properties of wooden elements on the achieved strengthening reliability, increase in bearing capacity and the estimation of the reduction of deflections and stresses of bent beams, made from various wood quality classes and reinforced using BFRP rods. The conducted testing featured an analysis of the ability of using lower quality class lumber to strengthen the beams with pre-stressed basalt fibre rods. This solution allows for reducing the cross-section or lower the class of used wood with simultaneous maintenance of comparable rigidity and bending strength of beams, as in the non-strengthened beams.
Highlights
The development and promotion of sustainable materials in the civil engineering industry is becoming increasingly important in recent years [1]
The results demonstrated that among all the tested systems, the BFRP fabric and PUR glue were the most suitable [38]
The quantity, health, dimensions and location of knots constituted the basis for the wood’s qualitative classification [45]. Based on this analysis, according to PN-D-94021:2013-10 [48], coniferous structural sawn wood intended for glulam beams was divided into three quality classes: KW—exclusive class, KS—medium quality class, KG—lower quality class, and designated for “rejection” [4,5,45,52,53,54,55,56]
Summary
The development and promotion of sustainable materials in the civil engineering industry is becoming increasingly important in recent years [1]. The composites are characterised by high fatigue properties comparing to common structural materials [19,20] Their use contributes to the reduction of maintenance costs. Many other researchers conducted theoretical and numerical analyses based on the experimental results from the non-linear workings of reinforced elements [23,30,39,40,41,42,43,44] Despite this fact, it was still necessary to conduct testing to better meet the requirements concerning production and designing of reinforced wooden structures [23]. The following study is based on the results of research carried out during the preparation of the doctoral dissertation of one of the authors of the article [45]
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