Browsing by Author "Gucuyen E."

Now showing 1 - 8 of 8
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    Early age corrosion of mild steel in aggressive media
    (2012) Ozturk A.U.; Gucuyen E.; Erdem R.T.; Seker S.
    Effects of the time of holding, type of section, and concentration of the solution on the early age corrosion of mild steel are studied. Section types for steel specimens were box, tube, and corner. They were subjected to 3.5%, 5.0%, and 7.0% NaCl solutions. It was established that the concentration of the solution affects the corrosion until reaching the saturation value. © 2012 Springer Science+Business Media New York.
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    Numerical analysis on corrosion resistance of mild steel structures
    (2013) Erdem R.T.; Seker S.; Ozturk A.U.; Gucuyen E.
    Corrosion resistances of mild steel specimens according to artificial neural network (ANN) analysis were investigated in the scope of this study. Corrosion rate values were taken into numerical analysis as a result of experimental studies under corrosive aggressive media. Mild steel specimens were selected according to the section type varieties such as box, tube and cornier. All steel specimens were subjected to the aggressive media formed using sodium chloride (NaCl with 99.8 % purity) solutions with 3.5, 5.0 and 7.0 % ratios per one liter distilled water and only distilled water. The reduction in corrosion rate has been observed and considered according to some corrosion loss respects. Corrosion rate prediction models were established between corrosion rate and parameters such as mass loss obtained by experimental studies using ANN. ANNs are computing systems that simulate the biological neural systems of the human brain. In this study, ANN analysis was generated to predict the corrosion rate values after experimental studies. Experimental and predicted values were compared by each other and it is seen that a strong relationship was established between them. © 2012 Springer-Verlag London Limited.
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    Corrosion effects on structural behaviour of jacket type offshore structures
    (Union of Croatian Civil Engineers and Technicians, 2014) Gucuyen E.; Erdem R.T.
    The application of weight losses to investigate corrosion effects on structural behaviour of an offshore structure under wave loads is presented in this study. Weight losses of sections obtained during previous experimental studies are implemented in the model. The jacket type structural model is analysed in its intact and deteriorated forms to demonstrate corrosion effects. The ABAQUS finite elements program is utilized and the fluid structure interaction (FSI) technique is adopted when modelling the interaction between solid and fluid domains. Mode shapes, first three natural frequencies, displacements of selected points, and maximum stresses, are comparatively presented.
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    Corrosion effects on structural behaviour of jacket type offshore structures; [Utjecaj korozije na izvanobalne konstrukcije]
    (Union of Croatian Civil Engineers and Technicians, 2014) Gucuyen E.; Erdem R.T.
    The application of weight losses to investigate corrosion effects on structural behaviour of an offshore structure under wave loads is presented in this study Weight losses of sections obtained during previous experimental studies are implemented in the model. The jacket type structural model is analysed in its intact and deteriorated forms to demonstrate corrosion effects. The ABAQUS finite elements program is utilized and the fluid structure interaction (FSI) technique is adopted when modelling the interaction between solid and fluid domains. Mode shapes, first three natural frequencies, displacements of selected points, and maximum stresses, are comparatively presented.
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    Non-linear analysis of reinforced concrete slabs under impact effect
    (Union of Croatian Civil Engineers and Technicians, 2017) Erdem R.T.; Gucuyen E.
    Most of the existing structures are designed to resist static loads only. Various researchers indicate that sudden loads affecting structural members should also be considered in the design phase. Surfaces of many structures are covered with concrete slab members that are under the effect of sudden loads such as accidental drops, rock falls, or military attacks. A non-linear analysis of RC slabs is performed in this study using the Abaqus software. Impact parameters such as accelerations, velocities, displacements, impact forces, and energy capacities, are determined for each slab.
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    Experimental study on hollow section joints under impact loading
    (Union of Croatian Civil Engineers and Technicians, 2020) Erdem R.T.; Kantar E.; Gucuyen E.; Alycyoolu B.
    Steel sections with four different joint types, subjected to sudden impact, are investigated in this study. A drop weight test setup was developed for this purpose. Impact tests were performed for two different energy levels. Acceleration-time, displacement-time, impact load-time, and impact load-displacement graphs were developed and presented. It was established that the behaviour of test specimens is affected by joint types and impact energy applied. Failure damage situation occurs earlier when rigidity of specimens decreases and when higher level of impact energy is applied. © 2020 Union of Croatian Civil Engineers and Technicians. All rights reserved.
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    Comparative analysis of tripod offshore structure
    (Union of Croatian Civil Engineers and Technicians, 2021) Gucuyen E.; Ensar Yiğit M.; Tugrul Erdem R.; Gökkuş Ü.
    Marine structures are nowadays used in a variety of ways. The analysis of a tripod-type offshore structure sixty m in total height is performed in this study. In addition to operation-related loads, the structure is also under the effect of wind and wave loads. While the Eurocode velocity profile is used to calculate wind forces, the Airy wave velocity profile is utilized to determine wave forces. The model is created by a finite elements analysis program, and is composed of fluid and structural parts. The interaction of the parts is ensured by Coupled Eulerian Lagrangian (CEL) technique. © 2020 Union of Croatian Civil Engineers and Technicians. All rights reserved.
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    Numerical modelling of floating structure with coupled Eulerian-Lagrangian technique
    (Croatian Association of Civil Engineers, 2022) Gucuyen E.; Erdem R.T.
    Floating structures are complex systems composed of superstructure, floating-mooring components, and anchors. In this study, the behaviours of a pontoon, which is used as a floating structure, and four mooring elements under different wave loading conditions were investigated. A numerical analysis of the coupled motions of the pontoon, mooring lines, and marine environment was performed. While the mooring lines were modelled as wire elements, the pontoon was modelled as a rigid body with six degrees of freedom. Wave loading conditions were represented using two different wave spectra. The first spectrum (Case I) was generated based on a single sinusoidal wave utilising the JONSWAP spectrum, whereas the second one (Case II) was generated based a superimposed multi-sinusoidal wave. Time-varying motions of the pontoon and tensions of the mooring lines were determined based on the numerical analyses for Cases I and II. Critical values were determined using the results of both cases. The numerical solutions were based on bidirectional fluid-structure interaction (FSI) analysis. A fully non-linear free surface simulation was performed using the coupled Eulerian-Lagrangian (CEL) technique. Furthermore, numerical results were compared with the results obtained from analytical solutions of free surface elevations. © 2022 Union of Croatian Civil Engineers and Technicians. All rights reserved.