Experimental and Numerical Investigation of the Bond Behavior of Smooth and Sand-Coated Rebar in Concrete by Flexural Bond Test Method

Öz

Reinforced concrete behavior can be exhibited by the movement of steel rebar and concrete together. This situation produses full adherence acceptance of the steel rebars and concrete interface for use in simple empirical calculations. However, the bond stress-slip model may be important in more realistic and comprehensive models. This situation causes other factors that create adherence to come to the fore, due to the lack of mechanical clamping in smooth surfaced bars. For this reason, it is important to define the bond stress-slip models accurately to the numerical models when constructing the numerical model of this type of rebars. In this study, two reinforced concrete flexural bond experimental test specimens reinforced with smooth surface steel bar and reinforced with sand coated steel bar were prepared. These two prepared samples were tested comparatively in terms of load bearing capacity, vertical displacement capacity, slip and collapse mechanism. As a result of the investigations, boundary values have been proposed for the BPE model, which is also recommended by the CEB FIB model, to be used in both smooth surface and sand-coated surface. In addition to these, numerical models with different embedment lengths were created in the light of experiments and proposed BPE models. It was concluded that the embedment length significantly affects the maximum load capacity in the numerical models created.

Anahtar Kelimeler

• Bond strength
• embedment length
• flexural bond test
• sand coating
• reinforcement slip

Proje Numarası

211N042

Beton İçindeki Düz Yüzeyli ve Kum Kaplı Donatı Çubuğu Aderans Davranışının Eğilmede Aderans Yöntemiyle Deneysel ve Sayısal Olarak İncelenmesi

Öz

Reinforced concrete behavior can be exhibited by the acting of steel rebar and concrete together. This situation produces full adherence acceptance of the steel rebars and concrete interface for use in simple empirical calculations. However, the bond-slip model may be important in more realistic and comprehensive models. This situation causes other factors that create adherence to come to the fore, due to the lack of mechanical clamping in smooth surfaced bars. For this reason, it is important to define the bond-slip models accurately to the numerical models when constructing the numerical model of this type of rebars. In this study, two flexural bond experimental test specimens reinforced with smooth surface steel bar and reinforced with sand coated steel bar were prepared. These two samples were tested comparatively in terms of load bearing capacity, vertical displacement capacity, slip and collapse mechanism. As a result of the investigations, boundary values have been proposed for the BPE model, which is also recommended by the CEB-FIP (2010) model, to be used in both smooth surface and sand-coated surface. In addition to these, numerical models with different embedment lengths were created in the light of experiments and proposed BPE models. It was concluded that the embedment length significantly affects the maximum load capacity in the numerical models created.

Anahtar Kelimeler

• eğilmede aderans testi
• kum kaplama
• kenetlenme boyu
• Aderans dayanımı
• donatı sıyrılması

Destekleyen Kurum

Bursa Teknik Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü

Proje Numarası

211N042

Teşekkür

Bu çalışma Bursa Teknik Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü tarafından desteklenmiştir. Proje Numarası: 211N042

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