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    Behavior of FRP-Confined Normal- and High-Strength Concrete under Cyclic Axial Compression
    (ASCE-AMER SOC CIVIL ENGINEERS, 2012) Ozbakkaloglu, Togay; Akin, Emre
    An important application of fiber-reinforced polymer (FRP) composites is as a confining material for concrete, both in the seismic retrofit of existing reinforced concrete columns and in the construction of concrete-filled FRP tubes as earthquake-resistant columns in new construction. The reliable design of these structural members against earthquake-induced forces necessitates a clear understanding of the stress-strain behavior of FRP-confined concrete under load cycles. This paper presents the results of an experimental study on the behavior of FRP-confined normal-and high-strength concrete under axial compression. A total of 24 aramid and carbon FRP-confined concrete cylinders with different concrete strengths and FRP jacket thicknesses were tested under monotonic and cyclic loading. Examination of the test results has led to a number of significant conclusions in regards to both the trend and ultimate condition of the axial stress-strain behavior of FRP-confined concrete. These results are presented, and a discussion is provided on the influence of the main test parameters in the observed behaviors. The results are also compared with two existing cyclic axial stress-strain models for FRP-confined concrete. DOI: 10.1061/(ASCE)CC.1943-5614.0000273. (C) 2012 American Society of Civil Engineers.
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    Numerical Study on CFRP Strengthening of Reinforced Concrete Frames with Masonry Infill Walls
    (ASCE-AMER SOC CIVIL ENGINEERS, 2014) Akin, Emre; Ozcebe, Guney; Canbay, Erdem; Binici, Baris
    In the last decade, a new strengthening methodology has been developed for reinforced concrete (RC) frames with hollow clay tile (HCT) infill walls by means of diagonally applied carbon fiber-reinforced polymer (CFRP) fabrics. In the experimental part of a study conducted by the authors, this user-friendly methodology was experimentally investigated considering different aspect (height/width) ratios of the infill walls. In this study, first a numerical model of the FRP strengthened infill walls strengthened with the proposed methodology is developed. Afterwards, the numerical simulation results are validated by use of experimental response curves and finally, a parametric study, which further investigates the effect of aspect ratio of HCT infill walls is presented.
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    Rehabilitation of Infilled Reinforced Concrete Frames with Thin Steel Plate Shear Walls
    (ASCE-AMER SOC CIVIL ENGINEERS, 2016) Akin, Emre; Korkmaz, Serra Zerrin; Korkmaz, Hasan Husnu; Diri, Ersan
    Different rehabilitation methods have been suggested for system improvement of existing deficient reinforced concrete building stock in seismic hazard areas. Although the use of steel plate shear walls for the rehabilitation of steel frames is common, their application to deficient reinforced concrete frames is not as common. In this study, the efficiency of steel plate shear walls on deficient reinforced concrete frames having hollow clay tile infill walls is investigated. Five one-bay, two-story 1/3 scaled RC frames were subjected to quasistatic lateral loading. The results indicated that significant improvement may be achieved in the lateral frame response. Lateral load-carrying capacities and energy dissipation capacities were considerably increased. However, a local shear strengthening of deficient columns may be required since shear demand on the columns increases considerably owing to tension field forces of the steel plate shear walls. (C) 2016 American Society of Civil Engineers.
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    Strengthening of Brick Infilled Reinforced Concrete (RC) Frames with Carbon Fiber Reinforced Polymers (CFRP) Sheets
    (SPRINGER, 2009) Akin, Emre; Ozcebe, Guney; Ersoy, Ugur
    In Turkey, experimental research on seismic rehabilitation started at Middle East Technical University (METU) in 1969. Since then several research projects in this field leading to developing rehabilitation technologies have been carried out. Majority of these researches inquired the introduction of reinforced concrete infills to the selected bays of the frames. This method developed at METU was applied to a significant number of seismically deficient RC buildings and it was proven to be effective in the past earthquakes. Application of this method, however, necessitates evacuation of the building during construction. Urgent developments of new strengthening methodologies which do not require the evacuation of the building, therefore, become imperative. Subsequently, a research project was initiated at METU Structural Mechanics Laboratory in 2001, which aimed to strengthen the existing masonry infill walls by means of CFRP sheets, to convert these walls into structural elements forming a new lateral load resisting system. As a continuation of the former project, in this study eight 1/3 scaled 2-story 1-bay RC frames, having the common deficiencies of the structures in Turkey, were tested. In this chapter, the test results are revealed in terms of lateral strength, stiffness and energy dissipation characteristics of the specimens.