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Browsing Mühendislik Fakültesi by Author "Avcı-Karataş, Çigdem"
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Item Analysis approach for composite steel plate shear walls (CSPSW) reinforced with CFRP(The 2021 World Congress on Advances in Structural Engineering and Mechanics (ASEM21), 2021-08-23) Avcı-Karataş, Çigdem; Ghamari, AliSteel plate shear walls (SPSWs) have been conducted as a capable system for resisting lateral forces induced on structures by wind and earthquakes. Adding concrete covering is a way of improving the behavior of SSWs. Studies by researchers indicated that, by using the concrete layer, stress is better distributed in the steel plate and the tension field lines are developed in a wider region. The only difference between the traditional system and the composited steel plate shear wall with the concrete system is that, in the latter, there is a gap between the concrete wall and the boundary columns and beams. In the traditional system, there is no gap, and the concrete directly rests against the boundary columns and beams. This seemingly simple modification resulted in a significant improvement in performance as well as an increase in ductility and damage mitigation. Some researchers showed that the carbon fiber-reinforced polymer (CFRP) would enhance the structural behavior of SPSWs. Nevertheless, no simple approach has been presented for composite SPSWs (CSPSWs) reinforced with CFRP. In the present research, the nonlinear behavior of CSPSW is determined and a method of analysis is proposed. The comparison between the findings of this approach and those of the finite element method (FEM) indicates that the proposed method is more accurate and its relevant computations take less time compared to the FEM. This model provides a good understanding of the interactions that might occur among different components of the system. It is also able to predict the overall pushover response, which is used in the nonlinear analysis of CSPSW systems.Item Corrosion Protection Process for Istanbul Golden Horn Metro (Halic) Crossing Bridge(International Congress on Engineering Sciences and Multidisciplinary Approaches, 2021-02-22) Avcı-Karataş, ÇigdemThis paper focuses on the corrosion control process for the Golden Horn (Halic) Metro Crossing Bridge which is constructed over the Golden Horn in the city of Istanbul-Turkey consisting of a swing bridge and cable-stayed bridge both to be founded on a steel tubular pile foundation as the most important infrastructure steel bridge in Turkey in two ways; i) the paint coating method used in 12.770 tons steel members for the superstructure and ii) an active cathodic protection (CP) method with external current source used in 7.928 tons steel members for substructures which impose an external voltage on the steel surface in a manner that forces the steel to become cathodic. One of the unique aspects of this present study is that the external current CP given details in this paper for a steel bridge is used in Turkey for the first time in this area.Item Modeling approach for estimation of ultimate load capacity of concrete-filled steel tube composite stub columns based on relevance vector machine(Niğde Ömer Halisdemir Üniversitesi (NÖHÜ) Mühendislik Bilimleri Dergisi (NÖHÜ Müh. Bilim. Derg.),, 2021-07-27) Avcı-Karataş, ÇigdemIn this paper, the applicability of relevance vector machine (RVM) has been explored to predict the ultimate axial load capacity of concrete-filled steel tube composite stub columns (CFSTCSCs) with circular sections under axial compression loadings. As an extension of support vector machine, RVM employs Bayesian inference to achieve parsimonious solutions for regression and classification. By using MATLAB software and 150 comprehensive experimental data presented in the previous studies, a model to predict the ultimate load of circular CFSTCSCs was developed by properly training the data. Utmost care has been taken in grouping the data for training and validation. About 80% dataset for training and 20% dataset for validation have been used, respectively. The results show that the predicted ultimate axial compression load capacity of CFSTCSC members is comparable with that of the corresponding experimental data and the percentage difference is about ∓11%.Item URBAN TRANSFORMATION PROGRESS OF REINFORCED CONCRETE (RC) AND MASONRY-MIXED BUILDINGS IN ISTANBUL(skişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering (ESTUJST-A), 2021-09-29) Avcı-Karataş, Çigdem; Çatalkaya, HakanIstanbul city is the center of increasing industrialization in Turkey with proportionally developing problems, such as distorted settlements, and slums, etc. The rapid migration to Istanbul, which is located in the earthquake hazard risk zone, has resulted in a raised population and these structures. Urban regeneration/transformation/planning is expressed as a comprehensive action plan that aims to provide a lasting solution to be economic, physical, social, and environmental conditions of a diverting region to solve the problems in the cities. This paper analyzes the urban transformation process and applications of reinforced concrete (RC) and masonry or mixed masonry-RC buildings in Istanbul within the scope of the urban planning law called “Law on Transformation of Areas at Risk of Natural Disaster” (Law No. 6306 dated 2012). To reach this goal, a total of 400 risky building forms with 150 RC buildings as well as 250 masonry-mixed buildings considered according to Law No. 6306 is compiled and evaluated as risky building data. The general characteristics of the RC and masonry-mixed buildings in Istanbul are determined by a date range of such as 2012–2020. With the results obtained from the paper, significant contributions have been made to the knowledge and technological capabilities at the international/national level.