Yazar "Demirtas, Gamze" seçeneğine göre listele

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    Nonlinear finite element analysis of steel fiber reinforced concrete beams subjected to impact loads
    (Pontificia Univ Catolica Chile, Escuela Construccion Civil, 2024) Serdar, Ahmet Hamdi; Caglar, Naci; Demirtas, Gamze; Saribiyik, Mehmet
    Steel fiber reinforced concrete, compared to the conventional concrete; is a composite building material that performs much better in terms of parameters such as ductility, energy absorption capacity, fracture toughness, fatigue resistance, and the use of steel fiber reinforced concrete (SFRC) in structures has become widespread. In this study, a nonlinear finite element model (FEM) has been developed that can represent the behavior of beams produced by using steel fiber concrete subjected to impact load. For this purpose, a finite element model of beam series produced with fiberreinforced concrete obtained from the literature was created. The ABAQUS package program was used to create models simulating the behavior. Numerical results showed that the model could successfully capture the experimental results of beams selected from the literature. In addition to simulation, a parametric study was also performed to investigate the effect of stirrups, reinforcement ratio, and drop height on the behavior of SFRC beams under impact loads. The results of the parametric study showed that increasing the fiber ratio and reinforcement ratio positively affected the behavior of SFRC beams in terms of displacement recovery.
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    Nonlinear finite element study on the improvement of torsional strengthening of RC beams with diagonal shear reinforcement
    (Pontificia Univ Catolica Chile, Escuela Construccion Civil, 2024) Subasi, Rojda Orman; Caglar, Naci; Demirtas, Gamze; Ozturk, Hakan
    Experimental and numerical studies are carried out by many researchers in order to examine the nonlinear behavior of reinforced concrete (RC) beams under the torsion moment and to improve the torsional moment capacity. In this study, a numerical study is performed to investigate efficiency of diagonal shear reinforcement (DSR) on the response of RC beams subjected to pure torsion. A nonlinear numerical model was constituted to simulate the response of the RC beams by using ABAQUS software program and verified with the selected experimental results from literature. The numerical analysis results proved that the nonlinear numerical model is quite successful in simulating the nonlinear behavior of RC beams and DSR makes a very significant contribution to the torsional moment capacity of the RC beam subjected to pure torsion.