Yazar "Sakcali, Gokhan B." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Bond Behavior of Sand-Coated GFRP Rebar Embedded in Concrete
    (Springer International Publishing Ag, 2024) Sakcali, Gokhan B.; Sagiroglu, Serkan; Yuksel, Isa
    Bond between rebar and the surrounding concrete is a vital property for the earthquake resistant reinforced concrete (RC) structures. It is required to provide sufficient force transfer between the concrete and rebars for the RC elements to exhibit composite behavior. In this study, it is aimed to examine the bond behavior of the sand-coated GFRP rebar embedded in the concrete. In this context, beam test specimens with three different embedment lengths were prepared in laboratory environment. The behavior of the specimens are investigated comparatively by utilizing the load-displacement relationships, the slippage of the rebar through the concrete, crack propagations, diagonal crack angles, failure modes, bond strength. As a result of the investigations, it was determined that the failure mode changed and accordingly load bearing capacity of the samples increased as the embedment length of the rebars increased. In addition, two different approaches were used to determine the bond stress and the results are discussed comparatively.
  • Küçük Resim Yok
    Öğe
    Experimental investigation of flexural bond behavior of sand-coated GFRP rebar embedded in concrete
    (Elsevier, 2024) Sakcali, Gokhan B.; Yuksel, Isa; Sagiroglu, Serkan
    Steel rebars used in Reinforced Concrete (RC) elements may be subjected to corrosion due to aggressive environmental conditions. Rebar corrosion reduces the durability and the structural capacity of RC elements. On the other hand, since the steel rebars affect the magnetic fields, it is not preferred to be used in RC structures which is used to carry the equipment that propagate magnetic waves such as toll plazas on highways. For these reasons, the use of Fiber Reinforced Polymer (FRP) rebars is increasing, especially in RC infrastructure constructions. The objective of the present study is to investigate the bond behavior of Glass Fiber Reinforced Polymer (GFRP) rebar with a sand-coated outer surface in concrete using the arched beam test method. The concrete strength and the embedment length were chosen as variable parameters and 34 beam test specimens were tested in the laboratory. A comparative analysis of the crack patterns, the diagonal crack angles and the failure modes of the specimens is made. In addition, the experimentally determined bond -slip relationships were compared with different analytical models in the literature. Consequently, a bond -slip model, which takes into account CMR (Cosenza-Manfredi-Realfonzo) for the increasing part and mBPE (modified Bertero-Popov-Eligehausen) for the decreasing part, is proposed to be used in the numerical models of RC beams with sand-coated GFRP rebars. A prediction model for the bond strength is proposed, along with a recommendation for an upper bound value for the bond stress, which indirectly offers a minimum embedment length for a bond without slippage.