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Bu çalışmada kademeli lif takviyeli kompozit kirişlerin eğilme dayanımları araştırılmıştır. Beton hacmine oranla %2 oranında lif (çelik ve makro sentetik polipropilen lif/MS) takviyeli karışımlar hazırlanmıştır. Katmanın konumuna (alt, üst ve tamamı) göre farklı özelliklerde hazırlanan 7 adet yarım ölçekli kiriş üzerinde 4 noktalı eğilme testi yapılmıştır. Deneyler sonrası numunelerde yük-deplasman davranışı, enerji yutma kapasitesi, çatlak ilerleyişi ve göçme durumları incelenmiştir. Yük taşıma kapasitelerinde referans kirişlere kıyasla, tamamı MS lif takviyeli olan kirişlerde %30, çelik lif takviyeli betonun alt katmanda olduğu kirişlerde %27 artış görülmüştür. MS lif takviyeli kirişlerde yük taşıma kapasiteleri maksimuma ulaştıktan sonra yük altında deplasman yapabilme kabiliyeti çelik lif içeren kirişlere göre daha fazla çıkmaktadır. Enerji yutma kapasiteleri incelendiğinde lif takviyeli betonun (FRC) alt katmanda olduğu kirişlerin, üst katmanda bulunan kirişlere oranla daha sünek davranış gözlenmiştir. FRC tabakasının kirişin üst kısmında olduğu durumlarda maksimum yük taşıma kapasitesine ulaşıldıktan sonra normal beton (NC) tabakasında erken göçme gözlendiğinden ani yük kayıpları gözlenmiştir. Çalışma sonucunda fiber miktarının azaltılmasının fiber kullanımının yaygın olduğu yapıların maliyetlerine olumlu yönde katkı sağlayacağı düşünülmektedir.
This study has studied the inclination resistance of gradual fiber supplementary composite curves. Additional fiber (steel and macro-synthetic polypropylene fiber/MS) mixture is prepared in proportion to 2% of the concrete volume. According to the location of the layer (low, up and all) in different characteristics prepared 7 pieces of semi-scale curve 4 points of inclination test was made. After experiments, samples studied the behavior of cargo-transport, energy consumption capacity, breakthrough progress and migration conditions. Compared to the reference shields in the cargo transport capacity, the shields with all MS fiber supplements have seen a 30% increase in the shields with steel fiber supplemented concrete in the lower layer of 27%. The capacity to move under the load after the maximum capacity is reached in MS fiber-added curves is greater than the capacity to move under the load compared to the curves containing steel fiber. When energy absorption capabilities were studied, the lower layer of fiber-supplemented concrete (FRC) has been observed with a more subtle behavior than the upper layer of concrete. In cases where the FRC layer is at the top of the curve, sudden loss of cargo has been observed since early migration in the normal concrete (NC) layer has been observed after the maximum cargo transport capacity has been achieved. The study finds that the reduction of the amount of fiber will contribute positively to the cost of structures where the use of fiber is common.
In this study, the flexural strengths of graded fiber-reinforced composite beams were investigated. Mixtures reinforced with fiber (steel and macro-synthetic polypropylene fiber/MS) at a ratio of 2% to the concrete volume were prepared. A 4-point bending test was performed on 7 half-scale beams prepared according to the position of the layer (bottom, top and whole). After the tests, load-displacement behavior, energy absorption capacity, crack propagation, and failure mechanism of the specimens were investigated. Compared to the reference beams, the load-carrying capacities increased by 30% in beams with full MS fiber reinforcement and by 27% in beams with steel fiber reinforced concrete in the substrate. After the load-carrying capacity of MS fiber-reinforced beams reaches the maximum, the ability to make displacement under load is higher than the beams containing steel fiber. When the energy absorption capacities are examined, it can be said that the beams with fiber reinforced concrete (FRC) in the bottom layer behave more ductility than the beams in the upper layer. In cases where the FRC layer is at the top of the beam, sudden load losses are observed as early failure is observed in the normal concrete (NC) layer after the maximum load-carrying capacity is reached. As a result of the study, it is thought that reducing the amount of fiber will contribute positively to the costs of structures where fiber use is common.
Alan : Fen Bilimleri ve Matematik; Mühendislik
Dergi Türü : Uluslararası
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