Etriyesiz FRP Boyuna Donatılı Betonarme Kirişlerin (a/d>2.5) Kesme Davranışları

Year 2024, Volume: 16 Issue: 1, 416 - 431, 31.01.2024

Saruhan Kartal

https://doi.org/10.29137/umagd.1404776

Abstract

Yüksek korozyon dayanımına sahip olan FRP donatıların (enine ve boyuna donatı) kullanımı gün geçtikçe yaygınlaşmaktadır. Ancak çelik donatılara kıyasla düşük elastisite modülü değerine sahip olan FRP donatılar betonarme kirişlerin çatlama dayanımını azaltmaktadır. Bu çalışmada temel amaç a/d>2.5 olan ve kesme donatısı bulunmayan FRP boyuna donatılı kirişlerin kesme davranışlarını ve dayanımlarını incelemektir. Bu kapsamda literatürde bulunan 149 deney verisi kullanılarak bir veri tabanı oluşturulmuştur. Literatürde sıklıkla kullanılan yönetmelikler ve modeller ile kesme dayanımları tahmin edilmiştir. Kesme dayanımını etkileyen değişkenler araştırılmıştır. Ayrıca, kesme donatısı bulunmayan FRP donatılı betonarme kirişlerin kesme tasarımı için yeni bir model önerilmiştir. Mevcut yönetmelik ve modellere göre önerilen model ile, deneysel sonuçlara daha yakın tahminler elde edilmiştir.

Keywords

FRP donatı, betonarme kiriş kesme davranışı, a/d oranı, beton kesme dayanımı

Shear Behaviors of FRP Longitudinally Reinforced Concrete Beams Without Stirrups (a/d>2.5)

Abstract

The use of Fiber-Reinforced Polymer (FRP) reinforcements, both transversely and longitudinally, is becoming increasingly widespread due to their high corrosion resistance. However, FRP reinforcements, with a lower modulus of elasticity compared to steel reinforcements, contribute to a reduction in the cracking strength of reinforced concrete beams. The main aim of the present study is to investigate the shear behavior and strength of FRP longitudinally reinforced beams (a/d>2.5) without shear reinforcements. To achieve this, a database was established using 149 experimental data available in the literature. Shear strengths were predicted with commonly used existing codes and models in the literature. Variables affecting shear strength were investigated. Additionally, a new model for the shear design of FRP-reinforced reinforced concrete beams without shear reinforcements was proposed. The proposed model yielded closer predictions to experimental results compared to existing codes and models.

Keywords

FRP reinforcement, shear behavior of reinforced concrete beams, a/d ratio, shear strength of concrete

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