Yazar "Karakoc, Cengiz" seçeneğine göre listele

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    Öğe
    AN INVESTIGATION ON THE NONLINEAR BEHAVIOR OF UNREINFORCED MASONRY WALLS
    (Yildiz Technical Univ, 2012) Jafarov, Oktay; Koksal, H. Orhun; Doran, Bilge; Karakoc, Cengiz
    Recently, numerous studies on the modeling technique for masonry structures and their structural components have been carried out, such as masonry shear walls existing in the literature. This paper is focused on nonlinear finite element modeling of masonry walls at a micro-level. For this purpose, Drucker-Prager yield criterion is employed in the elasto-plastic analyses of walls deriving the material parameters from the compressive strength of both brick and mortar. The performance of the proposed approach is verified by simulating a series of experiments reported in the literature.
  • [ X ]
    Öğe
    Computational material modeling of masonry walls strengthened with fiber reinforced polymers
    (Techno-Press, 2013) Koksal, H. Orhun; Jafarov, Oktay; Doran, Bilge; Aktan, Selen; Karakoc, Cengiz
    This paper aims to develop a practical approach to modeling of fiber reinforced polymers (FRP) strengthened masonry panels. The main objective is to provide suitable relations for the material characterization of the masonry constituents so that the finite element applications of elas to-plastic theory achieves a close fit to the experimental load-displacement diagrams of the walls subjected to in-plane shear and compression. Two relations proposed for masonry columns confined with FRP are adjusted for the cohesion and the internal friction angle of both units and mortar. Relating the mechanical parameters to the uniaxial compression strength and the hydrostatic pressure acting over the wall surface, the effects of major and intermediate principal stresses sigma(1) and sigma(2) on the yielding and the shape of the deviatoric section are then reflected into the analyses. Performing nonlinear finite element analyses (NLFEA) for the three walls tested in two different studies, their stress-strain response and failure modes are eventually evaluated through the comparisons with the experimental behavior.