Determination of the GFRP Reinforcement-Concrete Bond Strength from Pull-Out Tests Resulting in the Debonding Failure

Year 2019, Volume: 24 Issue: 2, 203 - 216, 30.08.2019

Boğaçhan Başaran , Saruhan Kartal İlker Kalkan

https://doi.org/10.17482/uumfd.447057

Abstract

Fiber reinforced
polymer (FRP) bars have begun to be used as an alternative to conventional
steel reinforcing bars in reinforced concrete structures, especially due to
their high resistance to corrosion and high tensile strength. However, their
bond behavior with concrete is different than steel because of their different
mechanical and physical properties compared to steel reinforcing bars. The bond
behavior of FRP bars with concrete depends on many parameters such as concrete
compressive strength, clear cover, embedment length, bar diameter, location of
the bar, bar surface properties. Different international FRP-reinforced
concrete codes recommended various equations for estimating the FRP-concrete
bond strength. These equations were established using experimental results that
resulted in splitting concrete failure. However, the maximum bond strength
cannot be determined from the loss of bond strength due to the fracture of
concrete and the parameters affecting the bond strength cannot be fully
determined from the specimens failed in splitting. For this reason, the
validity of the equations originating from the experiments ended up in the
splitting failure must be discussed. The present study aimed at developing a
bond strength equation between concrete and glass reinforced polymer (GFRP) by
using multiple linear regression analysis on a total of 243 pull-out
experiments from the literature that resulted in pullout failure. The proposed
bond strength equation was observed to yield to more consistent values with the
experimental results compared to the respective values from the international
code equations.

Keywords

GFRP rebar, bond strength, glass fiber reinforced polymer rebar

GFRP DONATI-BETON ARASINDAKİ ADERANS GERİLMESİNİN SIYRILMA GÖÇME TİPİ İLE SONUÇLANAN ÇEKİP ÇIKARMA DENEYLERİ İLE TESPİTİ

Abstract

Lif
takviyeli polimer donatılar (FRP) özellikle korozyona uğramama ve yüksek çekme
dayanımları nedeniyle betonarme yapılarda çelik donatıya alternatif olarak
kullanılmaya başlanmıştır. Ancak, mekanik ve fiziksel özelliklerinin çelik
donatıya göre farklı olmasından dolayı, FRP donatıların beton ile olan aderans davranışları
çelikten farklıdır. FRP donatının beton ile olan aderans davranışı, beton
basınç dayanımına, pas payına, donatı gömülme boyuna, donatı çapına, donatının
konumuna ve donatı yüzey özelliği gibi daha birçok değişkene bağlıdır. Farklı
uluslararası FRP donatılı beton yönetmelikleri, donatı aderansının tahmininde
kullanılacak çeşitli bağıntılar önermişlerdir. Bu bağıntılar, donatının
betondan ayrışması ile sonuçlanan deneylerin sonuçları kullanılarak
oluşturulmuştur. Ancak, ayrışma ile sonuçlanan numunelerde, betonun
çatlamasından doğan aderans kaybı neticesinde maksimum aderans
belirlenemeyeceği için aderansı etkileyen değişkenler tam olarak tespit
edilemez. Bu nedenle ayrışma göçme tipi ile sonuçlanan deneyler ile ortaya
konan bağıntıların geçerliliği tartışmalıdır. Bu çalışmada, literatürde mevcut
donatı sıyrılması ile sonuçlanan 243 adet çekip çıkarma deneyinden
yararlanılarak,  çoklu doğrusal regresyon
analizi ile cam takviyeli polimer donatıların (GFRP) beton ile aralarındaki
aderans bağıntısının tespit edilmesi amaçlanmıştır. Çalışma sonucunda önerilen
bağıntı kullanılarak tahmin edilen aderans gerilmesi değerlerinin, uluslararası
yönetmeliklerde geçen bağıntılar ile elde edilen değerlerden daha tutarlı
sonuçlar verdiği görülmüştür.

Keywords

GFRP donatı, donatı aderansı, cam takviyeli polimer donatı

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