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    Strengtening R/C and masonry structures with fiber reinfirced polymers in disaster areas
    (Ios Press, 2015) Doran, Bilge; Koksal, Hasan Orhun; Akbas, Bulent
    This paper presents the use of fiber reinforced polymers (FRP) for strengthening reinforced concrete (R/C) and masonry structures in disaster areas. FRPs have gained rapid popularity in recent years as one of the strengthening techniques of structural concrete and masonry members. Although substantial experimental and analytical researches have been conducted to model and simulate the response of these members confined with FRP jackets under concentric and eccentric loading, there is still an apparent need for efficient numerical models to further understand the stress-strain behavior and failure mechanisms of the confined material. The primary aim of this paper is to introduce an effective modeling procedure for the reinforced concrete (R/C) and masonry structural members such as columns and walls under shear and/or compression.
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    Öğe
    Stress-strain model for fibre-reinforced polymer confined rectangular columns
    (Ice Publ, 2011) Koksal, Hasan Orhun; Doran, Bilge
    Applying fibre-reinforced polymer sheets around existing columns is an innovative technique in the field of civil engineering due to their high stiffness and strength-to-weight ratio, corrosion resistance and potentially high durability. The confinement effect of high-stiffness fibre jackets simply results in an increase in the compressive strength of columns. Various constitutive models have been constructed to predict the increase in the axial strength of concrete due to the confinement effect of fibre-reinforced polymer laminates. In this paper, a new stress-strain model is proposed for square/rectangular concrete columns confined with fibre-reinforced polymer jackets. The model is an extension of previous work on circular columns, adopting a previously proposed relation to plot the stress-strain curves. The proposed model utilises a failure criterion of concrete under triaxial compression, unlike the most existing models which rely on a previously presented general formulation. A large comparative study of 163 square/rectangular concrete specimens is performed on the basis of the prediction accuracy of existing models and the proposed approach for their ultimate strengths in compression. The recommended axial stress-strain plots are used to simulate the uniaxial compressive tests. The results confirmed that the axial stress-strain relationship evaluated by the presented technique can appropriately describe the deformation under uniaxial compressive loading.