Yazar "Kara, M. Emin" seçeneğine göre listele

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  • Küçük Resim
    Öğe
    Improving shear capacity and ductility of shear-deficient RC beams using CFRP strips
    (Sage Publications, 2010) Altın, Sinan; Anıl, Özgür; Kopraman, Yağmur; Mertoğlu, Çelebi; Kara, M. Emin
    The results of an experimental investigation are presented in this article for improving the shear capacity and ductility of reinforced concrete beams by using CFRP strips. The purpose of this study is to obtain ductile flexural behavior for shear-deficient reinforced concrete beams. The experimental program consisted of 10 T cross-sectioned half scale simply supported beam specimens, seven of which were constructed with deficient shear reinforcement and the remaining three without any shear reinforcement. One beam was used as a reference and nine beams were strengthened using U-shaped CFRP strips with or without fan type anchorage. Three different CFRP strip spacing such as s(f) = 125 mm, 150 mm, and 200 mm were used. The effect of anchorages that were used at the ends of the strips on shear strength and behavior of the strengthened specimens was investigated. CFRP strips without anchorages improved the shear strength, but no flexural behavior was observed. specimens failed with brittle shear failure due to peeling of CFRP strip from RC beam surfaces. specimens with deficient shear reinforcement that were strengthened with anchored CFRP strips showed improved shear strength and ductile flexural behavior was observed. Similar behaviors were observed for specimens even without any shear reinforcement. When the CFRP strip strains of the specimens with anchorages and without anchorages were compared, maximum strains at anchored strips were approximately 56% larger than that of without anchorages.
  • [ X ]
    Öğe
    Nonlinear three-dimensional FE analyses of RC beams retrofitted using externally bonded CFRP sheets with or without anchorages
    (Taylor & Francis Ltd, 2017) Anıl, Özgür; Durucan, Cengizhan; Kara, M. Emin; Başeğmez, Özge
    In this study, behavior of reinforced concrete (RC) beams retrofitted using carbon fiber-reinforced polymer (CFRP) strips and anchorages is investigated by performing nonlinear finite-element (FE) analyses. The main aim of the study is testing the applicability of current FE techniques in the field of CFRP-retrofitted concrete elements. In the study, effect of CFRP strip width, presence of fan-type anchorages and CFRP patches were considered as main variables. In the study, eight RC beams with varying cross sectional properties along beam length are simulated. The simulated beams were tested in a former experimental study. The nonlinear FE analyses are conducted using the ANSYS FE software. The results obtained from the former experimental study are compared with the FE analyses results. From the results, it is observed that when properly modeled, FE simulations are efficient tools to estimate the nonlinear behavior of CFRP-retrofitted RC beams and similar structural elements.