Shear Behavior of Reinforced Concrete Beams With GFRP Longitudinally Bars And Gfrp Transverse Reinforcement

Year 2025, Volume: 25 Issue: 4, 854 - 864, 04.08.2025

Saruhan Kartal , Uğur Gündoğan , Ilker Kalkan

https://doi.org/10.35414/akufemubid.1594331

Abstract

Due to their corrosion resistance properties, the use of glass fiber reinforced polymer (GFRP) reinforcement is expanding and gaining increasing attention day by day. Studies utilizing longitudinal and transverse reinforcements made of GFRP are growing in number. Since GFRP reinforcements cannot be bent, GFRP stirrups are manufactured in factories with a 90° hook angle. Four-point bending tests were conducted on a total of five GFRP-reinforced concrete beams, one of which served as a reference. The reference beam was reinforced with GFRP longitudinal reinforcements and steel stirrups (135° hook angle). In the study, two parameters were considered: two different a/d ratios and two different stirrup spacings. The effects of these parameters on the shear and flexural behavior of the beams were investigated. Within this scope, the influence of these parameters on the failure mode, energy dissipation capacity, and load-deformation behavior of the beams was determined. Additionally, shear and flexural capacity predictions were made using expressions proposed by various codes and models, and the results were compared with experimental data. The results showed a good agreement with the experimental findings.

Keywords

GFRP Stirrup , RC Beam with GFRP Reinforcement , Flexural Behaviour , Shear Behavior

CTP Boyuna ve Enine Donatılı Betonarme Kirişlerin Kesme Davranışları

Abstract

Korozyona uğramama özellikleri sayesinde cam takviyeli polimer (CTP) donatıların kullanım alanı genişlemekte her geçen gün daha fazla ilgi görmektedir. CTP’den üretilmiş boyuna ve enine donatıların kullanıldığı çalışmalar gün geçtikçe artmaktadır. CTP donatıların bükülememesi nedeniyle CTP etriyeler 90° kanca açısına sahip olacak şekilde fabrikada üretilmektedir. Biri referans olmak üzere toplam beş adet CTP donatılı betonarme kirişin dört nokta eğilme testleri gerçekleştirilmiştir. Referans kiriş CTP boyuna donatılara ve çelik etriyelere (135° kanca açısı) sahiptir. Çalışmada parametreler olarak, iki farklı a/d oranı ve iki farklı etriye aralığı tercih edilmiş ve bu parametrelerin kiriş kesme ve eğilme davranışı üzerindeki etkileri incelenmiştir. Bu kapsamda ilgili parametrelerin kirişlerin kırılma modu, enerji sönümleme kapasitesi, yük deformasyon ilişkisi üzerindeki etkileri belirlenmiştir. Ayrıca farklı yönetmelik ve modellerce önerilen kesme ve eğilme kapasitesi ifadeleri kullanılarak tahminler yapılmış ve deneysel verilerle karşılaştırılmıştır. Deneysel verilerle oldukça uyumlu sonuçlar elde edilmiştir.

Keywords

CTP Etriye , CTP Donatılı Betonarme Kiriş , Eğilme Davranışı , Kesme Davranışı

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