Browsing by Author "Baǧci M."

Now showing 1 - 7 of 7
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    Determination of the steady-state response of viscoelastically supported rectangular orthotropic mass loaded plates by an energy-based finite difference method
    (2005) Altintaş G.; Baǧci M.
    A method based on a variational procedure in conjunction with a finite difference method is used to examine the free vibration characteristics and steady-state response to a sinusoidally varying force applied orthotropic elastic rectangular plate carrying masses. Using the energy-based finite difference method, the problem reduced to the solution of a system of algebraic equations. Due to the significance of the fundamental natural frequency of the plate, its variation is investigated with respect to the mechanical properties of the plate material, the translational spring coefficient of the supports, the mass distribution, the mass locations and the quantity of mass. The steady-state response of the viscoelastically supported plates was also investigated numerically for the damping coefficient of the supports and the force distribution in addition to the characteristics of the plate system. Many new results are presented and the validity of the present approach is demonstrated by comparing the results with other solutions based on the Kirchhoff-Love plate theory. © 2005 SAGE Publications.
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    Determination of the steady state response of EFEF /VFVF supported rectangular specially orthotropic plates
    (Association for Scientific Research, 2006) Altintaş G.; Baǧci M.
    Determination Of The Steady State Response Of EFEF / VFVF Supported Rectangular Specially Orthotropic Plates is presented. EFEF and VFVF plates, these are rectangular plates with two opposite edges elastically or viscoelastically supported and remaining others free. Using the energy based finite difference method, the problem is modelled by a kind of finite difference element. Due to the significiance of the fundamental frequency of the plate, its variation was investigated with respect to mechanical properties of plate material and translational spring coefficient of supports. The steady state response of viscoelastically supported plates was also investigated numerically for various damping coefficients. In the numerical examples, the natural frequency parameters and steady state responses to a sinusoidally varying force are assessed for the fundamental mode. Convergence studies are made. Many new results have been presented. Considered problems are solved within the frame work of Kirchhoff-Love hypothesis. © Association for Scientific Research.
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    Artificial neural network analysis of infilled planar frames
    (ICE Publishing Ltd, 2006) Baǧci M.; Altintas G.
    In this study, infilled planar frames have been analysed using an artificial neural network. The data used were provided by a finite element model (FEM) in which nonlinearity of materials and the structural interface were taken into account under increasing lateral load. For the skeleton frame, the panel was modelled by a two-noded frame element and a four-noded isoparametric element respectively. The Von Mises failure criterion was used for the infill wall. Values obtained from FEM were used in training the network established. An artificial neural network (ANN) architecture was chosen in which a multilayer, feed-forward and back-propagation algorithm was used. The controls conducted in the test phase showed that training was satisfactory. The study has proved that the ANN could be successfully used for analysis of infilled planar frames.
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    Neural network model for moment-curvature relationship of reinforced concrete sections
    (Association for Scientific Research, 2010) Baǧci M.
    The analysis of moment-curvature relationship of reinforced concrete sections is complex due to large number of variables as well as non-linear material behavior involved. Artificial Neural Networks (ANNs) are found to be a tool capable of solving such problems. This has led to increasing use of ANN for analyzing the behavior of reinforced concrete sections. This paper reports the details of a study conducted using ANN for predicting moment-curvature relationship of a reinforced concrete section. Using data generated based on the analytical solutions, the ANN model was trained. The trained model was tested for a different set of input parameters and the output values were compared with the values based on analytical results. The agreement was found to be good. © Association for Scientific Research.
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    A comparative evaluation of performance based analysis procedures according to 2007 Turkish Earthquake Code and FEMA-440
    (Association for Scientific Research, 2011) Erdem R.T.; Baǧci M.; Demir A.
    Chapter 7 of the 2007 Turkish Earthquake Code (TEC) entitled "Assessment and Strengthening of Existing Buildings" sets standards for assessment and rehabilitation of existing buildings. Linear elastic and non-linear evaluation procedures of 2007 TEC are applied to reinforced concrete buildings. 2007 TEC gives two methods for assessment and rehabilitation of existing buildings. Linear elastic and non-linear static evaluation procedures are proposed for structural evaluation. A performance-based evaluation methodology is used under three levels of earthquake ground motion intensities with different return periods. The performance acceptance criteria are based on demand to capacity ratios at critical sections for the linear evaluation procedures (equivalent seismic load method and mode superposition method) and material strains for the non-linear evaluation procedures (the non-linear static pushover analysis). Member performance limits are described for three damage levels, considering the anticipated failure mode and ductility capacity of each member. Structural performance is then calculated by accounting for the distribution of member damages over the building.. Consistency between the results of the methods used for seismic evaluation of existing buildings is of prime importance. For this purpose, an irregular structure of in plane (A3 type) and 3 story is considered. The target performance level of the building is obtained by applying the linear and the non-linear evaluation procedures. The results are given comparatively on the target performance level of the building. Furthermore non-linear procedure results are compared between 2007TEC and FEMA-440 Capacity-Spectrum Method (CSM) and Displacement- Coefficient Method (DCM). © Association for Scientific Research.
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    Determination of the impact behavior of concrete and reinforced concrete beams
    (Association for Scientific Research, 2013) Gücüyen E.; Erdem R.T.; Kantar E.; Baǧci M.
    Behavior types of structural members under various loads have been a main field of interest in engineering sciences. There have been several studies performed about determining the behavior of members under tensile, compression, bending and torsion loads until today. However, terrorist attacks and destructive earthquakes have aroused interests of scientists and engineers about solutions of impact problems. In this study, behavior of concrete and reinforced concrete beams under impact loads is investigated. For this purpose, a testing apparatus has been created. Data obtained from experimental study are compared with the analysis results of ABAQUS finite elements program.
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    Effects of fiber reinforced plaster on the earthquake behavior of masonry buildings
    (Shiraz University, 2015) Başaran H.; Demir A.; Baǧci M.; Ercan E.
    In this paper the traditional covering plaster of masonry buildings is supplied with Polypropylene and steel fiber to enhance their seismic behavior. The plaster mix proportion is determined by some initial mortar tests. Also, one story, single span masonry building specimen plastered with different mortars is tested on a shaking table 8 times under a seismic input and the performance of the specimens with the above types of mortar is evaluated. The specimen plastered with a traditional plaster was regarded as control and its earthquake behavior was compared to that reinforced by fiber plaster. Steel fiber or polypropylene addition significantly increased stiffness, displacement ability and energy consumption ability of specimens as compared to control. The suggested reinforcement method was proven to strengthen masonry buildings in a fast, reliable and economical way. Moreover, it can easily be adapted to any masonry building without causing any negative impact. The suggested method is fire and corrosion resistant. © Shiraz University.