ÇEKME BÖLGESİ LİFLİ BETON OLAN CAM FİBER TAKVİYELİ POLİMER (GFRP) ve ÇELİK DONATILI ETRİYESİZ KİRİŞLERİN EĞİLME ETKİSİ ALTINDAKİ DAVRANIŞI ve HASAR ANALİZİ

Yıl 2018, Cilt: 6 Sayı: 4, 654 - 667, 01.12.2018

Lokman Gemi , Mehmet Alpaslan Köroğlu

https://doi.org/10.15317/Scitech.2018.159

Öz

Donatı çeliğinde meydana gelen korozyon, yapı elemanlarının önemli problemlerinden biri haline gelmiştir. Bu yüzden son yıllarda, Elyaf Takviyeli Polimerler (FRP), korozyon dayanımı yüksek olması sebebiyle, çelik donatılara alternatif olarak kullanılmaya başlanmıştır. Ayrıca, FRP donatıların yüksek dayanımı, hafif olması ve kimyasal etkilere karşı dayanımı özellikle endüstriyel alandaki kullanımını arttırmıştır. Bu çalışmada, çekme bölgesinde 5 cm yüksekliğinde polipropilen lif katkılı betonun kullanıldığı çelik ve Cam Elyaf Takviyeli Polimer (GFRP) donatılı etriyesiz kirişlerin eğilme etkisi altındaki davranışı deneysel olarak incelenmiş ve devamında hasar analizleri yapılmıştır. Bu amaçla geleneksel çelik ve GFRP donatılı etriyesiz kirişler üretilmiş ve üç noktalı eğilme testleri yapılmıştır. Eğilme testleri sonrasında eğilme dayanımları hesaplanarak yük-deplasman grafikleri oluşturulmuş, malzeme davranışındaki farklılıklar incelenmiştir. Deneylerden sonra GFRP donatılarda oluşan hasarlar incelenmiş ve hangi hasar modları olduğu tespit edilmiştir. Çalışmalar sonucunda GFRP donatılı kirişlerin eğilme performanslarının büyük oranda arttığı görülmüştür.

Anahtar Kelimeler

Hasar analizi, GFRP donatı, Kompozit beton, Kompozit kiriş

Bending Behavior and Failure Analysis of GFRP and Steel Rebar Reinforced Beam Without Transverse Reinforcement with Fiber Reinforced Concrete in Tension Zone

Öz

Corrosion on steel reinforcement has been one of the most essential problems in construction materials. Therefore, in the last decade FRP re-bars have been widely used instead of traditional steel reinforcement because of Fiber Reinforced Polymers (FRP) having high corrosion resistance. FRP composites have attracted the attention of researchers in the field of industry due to high strength, lightweight and non-magnetic properties. In addition, high strength of FRP re-bars, being lightweight and chemical resistant properties have increased its use especially in industrial areas. In this study, bending behaviors of beams having steel and Glass Fiber Reinforced Polymer (GFRP) re-bars with 5 cm high polypropylene fiber reinforced concrete in tensile zone were investigated experimentally and damage analysis were carried out. For this purpose, three-point bending tests were performed to conventional steel and GFRP reinforced beams. After bending tests, bending strengths were calculated and load-deflection graphs were created and differences in material behavior were investigated. After the tests, damages GFRP re-bars were investigated and the modes of fractures were determined. As a result of the studies, it is observed that GFRP reinforced beams has increased the bending performance significantly.

Anahtar Kelimeler

Failure analysis, GFRP rebar, Composite concrete, Composite beam

Kaynakça

• Almusallam, T. H., 1997, “Analytical Prediction of Flexural Behavior of Concrete Beams Reinforced by FRP Bars”, Journal of Composite Materials, Cilt 3, Sayı 7, ss 640-657.
• Barris, C., Torres, L., Turon, A., Baena, M., Catalan, A., 2009, “An Experimental Study of the Flexural Behaviour of GFRP RC Beams and Comparison with Prediction Models”, Composite Structures, Cilt 91, Sayı 3, ss. 286-295.
• El-Sayed, A. K., El-Salakawy, E. F., Benmokrane, B., 2006, “Shear Capacity of High-Strength Concrete Beams Reinforced with FRP Bars”, ACI Structural Journal, Cilt 103, Sayı 3, ss. 383.
• Gemi, L., Kara, M., Avci, A., 2016, “Low Velocity İmpact Response of Prestressed Functionally Graded Hybrid Pipes” Composites Part B: Engineering, Cilt 106, ss. 154-163.
• Gemi, L., Şahin, Ö. S., Akdemir, A., 2017, “Experimental Investigation of Fatigue Damage Formation of Hybrid Pipes Subjected to Impact Loading under Internal Pre-stress”, Composites Part B: Engineering, Cilt 119, ss. 196-205.
• Gemi, L., Köroğlu, M. A., Ashour, A., 2017, “Experimental Study on Compressive Behavior and Failure Analysis of Composite Concrete Confined by Glass/epoxy ± 55° Filament Wound Pipes”, Composite Structures, Cilt 187, ss. 157-168.
• Gemi, L., 2018. “Investigation of the Effect of Stacking Sequence on Low Velocity Impact Response and Damage Formation in Hybrid Composite Pipes under Internal Pressure. A comparative study”, Composites Part B: Engineering, Cilt 153, ss. 217-232.
• Gravina, R. J., Smith, S. T., 2008, “Flexural Behaviour of Indeterminate Concrete Beams Reinforced with FRP Bars”, Engineering Structures, Cilt 30, Sayı 9, ss. 2370-2380.
• Habeeb, M., Ashour, A. F., 2008, “Flexural Behavior of Continuous GFRP Reinforced Concrete Beams”, Journal of Composites for Construction, Cilt 12, Sayı 2, ss. 115-124.
• Joseph, E., 2000, “A Prospective, Randomized Trial of Vacuum-As-Sisted Closure Versus Standard Therapy of Chronic Non-Healing Wounds”, Wounds, Cilt 12, ss. 60-67.
• Kara, I. F., Ashour, A. F., Köroğlu, M. A, 2015, “Flexural behavior of hybrid FRP/steel reinforced concrete beams”, Composite Structures, Cilt 129, ss. 111-121.
• Kara, I. F., Ashour, A. F., Köroğlu, M. A., 2016, “Flexural Performance of Reinforced Concrete Beams Strengthened with Prestressed Near-Surface-Mounted FRP Reinforcements”, Composites Part B: Engineering, Cilt 91, ss. 371-383.
• Kassem, C., Farghaly, A. S., “Benmokrane, B., 2011, “Evaluation of Flexural Behavior and Serviceability Performance of Concrete Beams Reinforced with FRP Bars”, Journal of Composites for Construction, Cilt 15, Sayı 5, ss. 682-695.
• Köroğlu, M. A., 2016, “Mechanical Characterization of Recycled Tires in Concrete”, Selçuk Üniversitesi Mühendislik, Bilim ve Teknoloji Dergisi, Cilt 4, Sayı 4, ss. 330-336.
• Köroğlu, M. A., Özdöner, N., 2016, “Behavioural Study of Steel Fiber and Polypropylene Fibre Reinforced Concrete”, Paper presented at the Key Engineering Materials, ss. 59-63.
• Lou, T., Xiang, Y., 2010, “Numerical Analysis of Second-Order Effects of Externally Prestressed Concrete Beams”, Structural Engineering and Mechanics, Cilt 35, Sayı 5, ss. 631-643.
• Morkavuk, S., Köklü, U., Bağcı, M., Gemi, L., 2018, “Cryogenic Machining of Carbon Fiber Reinforced Plastic (CFRP) Composites and the Effects of Cryogenic Treatment on Tensile Properties: A Comparative Study”, Composites Part B: Engineering, Cilt 147, ss. 1-11.
• Qu, W., Zhang, X., Huang, H., 2009, “Flexural Behavior of Concrete Beams Reinforced with Hybrid (GFRP and Steel) Bars”, Journal of Composites for Construction, Cilt 13, Sayı 5, ss. 350-359.
• Razaqpur, A., Svecova, D., Cheung, M. S., 2000, “Rational Method for Calculating Deflection of Fiber-Reinforced Polymer Reinforced Beams”, Structural Journal, Cilt 97, Sayı 1, ss. 175-184.
• Razaqpur, A. G., Isgor, B. O., Greenaway, S., Selley, A., 2004, “Concrete Contribution to the Shear Resistance of Fiber Reinforced Polymer Reinforced Concrete Members”, Journal of Composites for Construction, Cilt 8, Sayı 5, ss. 452-460.
• Tarakçioğlu, N., Gemi, L., Yapici, A., 2005, “Fatigue Failure Behavior of Glass/epoxy ±55 Filament Wound Pipes under Internal Pressure”, Composites Science and Technology, Cilt 65(3-4), ss. 703-708.
• Toutanji, H. A., Saafi, M., 2000, “Flexural Behavior of Concrete Beams Reinforced with Glass Fiber-Reinforced Polymer (GFRP) Bars”, ACI Structural Journal, Cilt 97, Sayı 5, ss. 712-719.
• Vijay, P., GangaRao, H. V., 2001, “Bending Behavior and Deformability of Glass Fiber-Reinforced Polymer Reinforced Concrete Members”, Structural Journal, Cilt 98, Sayı 6, ss. 834-842.