Browsing by Author "Yaman, I.O."

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    Behaviour of Cfrp Confined Low Strength Concrete Columns Under Temperature Changes
    (2012) Erdil, B.; Akyuz, U.; Yaman, I.O.
    In this study, an experimental program was established to understand the behaviour of FRP-confined low strength cylindrical and square-section concrete columns under temperature changes. The experimental program was divided into four groups. First group of specimens were kept under room temperature and used as control specimens. In the second group, specimens were exposed to predetermined heating-cooling cycles in a specially designed environmental test chamber. Third group of specimens were placed in water, kept in the environmental test chamber, and subjected to the same heating-cooling cycles. In the last group, specimens were subjected to outdoor exposure in Ankara, Turkey. After the aging tests, specimens were tested under uniaxial compression to determine the change in their mechanical properties.
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    Conference Object
    A Comparative Study of Force-Deformation Relationship of Frp-Confined Concrete Columns
    (2011) Erdil, B.; Akyuz, U.; Yaman, I.O.; Irfanoglu, A.
    In this study, the FRP-confined concrete models for prismatic members given in the ACI440.2R-08 and Turkish Earthquake Code (TEC2007) are compared with the experimental data taken from the literature. It is found that TEC2007 assumes only hardening behavior for concrete strengthened with FRP. Although ACI440.2R-08 assumes a hardening and softening behavior depending on the confinement-effectiveness, the limit separating the hardening and softening must be improved to predict the behavior well. The assumptions in these codes cannot predict the post-peak region of force-deformation curves because of the high factor of safeties. It is essential to understand the degree of confinement, confinement effectiveness and the resulting stress-strain relationship of a concrete strengthened with FRP.