Kademeli Lif Takviyeli Kompozit Beton Kirişlerin Eğilme Davranışı

Year 2021, Issue: 28, 338 - 345, 30.11.2021

Abdullah Müsevitoğlu Atilla Özütok Serkan Salkım Oğuzhan Çağlar Gökalp Kırca Kadirhan Ertürk Mesut Acar

https://doi.org/10.31590/ejosat.999026

Abstract

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.

Keywords

Fiber takviyeli beton, Makro sentetik polipropilen fiber, çelik fiber, eğilme dayanımı, Kompozit., Fiber takviyeli beton, Makro sentetik polipropilen fiber, çelik fiber, eğilme dayanımı, Kompozit.

Flexural Behavior of Graded Fiber Reinforced Composite Concrete Beams

Abstract

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.

Keywords

Fiber reinforced concrete, Macro synthetic polypropylene fiber, Steel fiber, Flexural behavior, Composite.

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