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

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

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.

Keywords:

Failure analysis, GFRP rebar, Composite concrete, Composite beam,

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