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    Computational analysis of fibre reinforced polymer-confined masonry columns
    (2011) Köksal, H.O.; Aktan, S.; Doran, B.; Karakoç, C.
    A steady growth in the application of fiber reinforced polymers (FRP) for strengthening of masonry structures against earthquake hazard and static overloading is therefore beneficial for the maintenance of the architectural cultural heritage. The aim of this paper is to present a practical modeling approach for the nonlinear finite element analysis (NLFEA) of FRP-confined masonry columns under concentric loading. A computational study using the finite element program LUSAS on the fracture behavior of concrete elements confined with CFRP jackets has been conducted by the application of Drucker-Prager criterion to the FRP-confined masonry columns tested by Krevaikas and Triatafillou (2005). Modeling aspects and detailed analysis results for square masonry columns are presented and discussed with a view toward assessing the capabilities of the structural modeling. © Civil-Comp Press, 2011.
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    Öğe
    Elastoplastic Finite-Element Analysis of FRP-Confined Masonry Columns
    (Asce-Amer Soc Civil Engineers, 2012) Koksal, H. O.; Aktan, S.; Kuruscu, A. O.
    The focus of the work described in this paper is on the development of a practical Drucker-Prager (DP) type constitutive model for the nonlinear finite-element analysis (NLFEA) of fiber-reinforced polymers (FRP)-confined masonry columns under concentric compression. This paper introduces analytical relations for the cohesion and internal friction angle for masonry constituents, i.e., solid clay bricks and mortar. The proposed relations account for the slight change of the linear part of the compressive meridian into a curve at higher hydrostatic pressure values and predict the compressive and tension meridians of concrete even for high hydrostatic pressure. Evaluating possible failure criteria in FRP-confined masonry columns, 14 test specimens from three major experimental studies are successively modeled through the proposed approach. The results of NLFEA show both satisfactory predictions of the stress-strain response of the columns and theoretical understanding for the strain distributions in the FRP sheets. DOI: 10.1061/(ASCE)CC.1943-5614.0000268. (C) 2012 American Society of Civil Engineers.