Yazar "Ergün, Mustafa" seçeneğine göre listele

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    Determination of rebar effect on dynamic characteristics and dynamic behavior of reinforced concrete bridges
    (2020) Doğan, Umut Ufuk; Altunışık, Ahmet Can; Ergün, Mustafa
    In this study, it is aimed to be searched the effect of the rebar on the structural behavior of reinforced concretebridges formed with the finite element method. For this purpose, the numerical model of the bridge withknown dimensions, material properties and rebar configuration was modeled using ANSYS finite elementanalysis program. In the first model, it was thought that the bridge was constructed using only concrete, rebarwas not taken into consideration. Then the same bridge was modelled without changing the boundaryconditions as if it was built by reinforced concrete material in which rebar and concrete were together andthe modal analyses were carried out on this model again. The dynamic characteristics of the two differentbridge models were determined using numerical methods and the effect of the rebar on these characteristicswas presented by comparing them with each other. When the results obtained were examined, it was foundthat the rebar had no significant effect on the modal behavior of the bridge. Thus, not taking into account therebar will provide a great convenience during the modeling stage. In addition, linear and nonlinear dynamicanalyzes were performed on the reinforced and unreinforced finite element models of the bridge using theeffective earthquake acceleration record of the Erzincan earthquake of 1992 and structural behavior wasevaluated. The results are presented in comparison with the graphs and tables in this paper.
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    Seismic behavior assessment of RC buildings controlled by passive and active techniques
    (2024) Ergün, Mustafa; Uyar, Mehmet
    In this paper, a numerical study was carried out on the effectiveness of the active earthquake control method in improving the earthquake response of RC buildings. High damping rubber bearing design was made according to the criteria of the Uniform Building Code. Three different types of isolators were obtained geometrically. Passive earthquake control of the building was provided by placing these isolators under the columns. For active earthquake control of the building, controller design was realized by integrating it into the FE transient analysis in ANSYS. The active earthquake control design was studied using a force-based and displacement-based controller with acceleration and displacement feedback. The linear dynamic earthquake analysis in the time history of all three states of the building (un-controlled, passive, and active-controlled) was made using the acceleration record of the Seferihisar (İzmir) earthquake. When the results are examined, it is seen that the active earthquake control method provides almost all of the positive behavior expected from the passive earthquake control method. In addition, it eliminates some of the disadvantages of the passive earthquake control method.
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    The stress analysis of a shear wall with matrix displacement method using rectangular finite element
    (2021) Ergün, Mustafa; Ateş, Şevket
    The aim in this study is to numerically present some characteristic features of the rectangular finite elementusing the matrix displacement method and to show the utility of this element in plane stress problemscompared to the finite element method. The paper consisted of three parts. In the first part, all of the finiteelement formulation steps from choosing the convenient coordinate system to creating element stiffnessmatrix are presented respectively. In the second part of the study, a static finite element analysis of the shearwall is also made by ANSYS Mechanical APDL. In the final part, the results (displacements, strains andstresses) obtained from the previous parts are compared with each other by the help of tables and graphics.The results show that this method is effective and preferable for the stress analysis of shell structures. Furtherstudies should be conducted in order to indicate the efficiency of the matrix displacement method for thesolution of different types of plane stress problems using different finite elements.