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    Flexural Behavior of Laminated Wood Beams Strengthened with Novel Hybrid Composite Systems: An Experimental Study
    (Korean Society of Wood Science Technology, 2023) Ozdemir M.F.; Maras M.M.; Yurtseven H.B.
    Wooden structures are widely used, particularly in earthquake zones, owing to their light weight, ease of application, and resistance to the external environment. In this study, we aimed to improve the mechanical properties of laminated timber beams using novel hybrid systems [carbon-fiber-reinforced polymer (CFRP) and wire rope]. Within the scope of this study, it is expected that using wood, which is an environmentally friendly and sustainable building element, will be more economical and safe than the reinforced concrete and steel elements currently used to pass through wide openings. The structural behavior of the hybrid-reinforced laminated timber beams was determined under the loading system. The experimental findings showed that the highest increase in the values of laminated beams reinforced with steel ropes was obtained with the 2N reinforcement, with a maximum load of 38 kN and a displacement of 137 mm. Thus, a load increase of 168% and displacement increase of 275% compared with the reference sample were obtained. Compared with the reference sample, a load increase of 92% and a displacement increase of 14% were obtained. Carbon fabrics placed between the layers with fiber-reinforced polymer (FRP) prevented crack development and provided significant interlayer connections. Consequently, the fabrics placed between the laminated wooden beams with the innovative reinforcement system will not disrupt the aesthetics or reduce the effect of earthquake forces, and significant reductions can be achieved in these sections. © 2023 The Korean Society of Wood Science & Technology.
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    Mechanical properties of confined damaged concrete strengthened with fibre reinforced polymer wraps
    (TUBITAK, 2021) Maras M.M.
    This study aims to investigate behaviour and failure modes of damaged concrete strengthened using fibre reinforced polymer (FRP) with three different thickness (50 mm, two-50 mm, and 150 mm strips) and different configurations of CFRP wraps. The mechanical performance of damaged concretes was evaluated utilizing carbon fibre reinforced polymer (CFRP) composites under compression tests. The strengthened confined damaged concrete specimen was compared with unconfined damaged concrete in terms of compressive strength, failure modes, and cracks patterns. A total of 8 different damaged and undamaged specimens were tested, with one of these specimens acting as a control damage specimens and the remaining specimens wrapped with different cross?section configurations of CFRP by different wrapping schemes. The results revealed that the partially-wrapped damaged specimens exhibited a higher compressive strength as compared to the corresponding control damaged specimens. The strengthened confined concrete specimen displayed more ductile behaviour, which depends on the failure mode. As a result of using the two-50 mm thickness of CFRP strips, a significant increase in the ultimate load was observed due to the high strength of the composites. © 2021, TUBITAK. All rights reserved.
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    Tensile and flexural strength cracking behavior of geopolymer composite reinforced with hybrid fibers
    (Springer Science and Business Media Deutschland GmbH, 2021) Maras M.M.
    Geopolymer composites are amorphous aluminosilicates that result from the polycondensation of alkali-activated inorganic compounds. The alkali-activated materials display many important advantages over conventional materials owing to high compressive strength, low carbon footprint, and eco-friendliness. This study investigated the effect of hybridization of polypropylene (PP), glass, and polyamide (PA) as reinforcing fiber for the alkali-activated composites. The results demonstrated that the compressive strength of the M15 hybrid geopolymer hybrid sample was greater than its counterpart in the other matrices. While 1.75% PP fiber-reinforced geopolymer composite displayed ductile behavior, the capacity peak load point was lower than its PA fiber counterpart. Microstructure observation concerning images demonstrated no significant damage to hybrid fibers in the alkali-activated materials. Besides, a high amount of geopolymer composite matrix was observed covering the surface of the PP fiber, which implied high-strength friction and bonds that could resist either fiber pullout or failure. © 2021, Saudi Society for Geosciences.