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Öğe Betonarme Kolonların Sargısız Ve Sargılı Beton Dayanımının Analitik Olarak Araştırılması(Selçuk Üniversitesi Mühendislik Fakültesi, 2019) Yüksel, S. Bahadır; Foroughi̇, SaeidBetonarme kolonlar taşıyıcı sistemlerin moment aktaran kritik yapısal sistemleridir ve yeterli dayanım ve süneklikte tasarlanmalıdır. Betonarme kolonların sargı donatısı özellikle depreme maruz kaldıkları durumlarda sargı etkisi ile kolonların dayanım ve sünekliğinin artırmasında önemli rol oynar. Betonarme kolonlarda sargı donatısı boyuna donatının yerel burkulmasını geciktirmek, kesme kuvvetine karşı koymak, ani kesme kırılmasını önlemek ve sargı etkisi ile dayanım ve sünekliği artırmak için kullanılır. Sismik yüklere maruz kalan betonarme elemanların davranışı, esas olarak betonun nihai dayanımına ve sünekliğine bağlıdır. Bu parametreleri araştırmak için değişik geometride betonarme kolon modelleri tasarlanmıştır. Sargı donatı çapının ve sargı donatı aralığının betonarme kolon modellerinin davranışına etkisi analitik olarak araştırılmıştır. Sargı donatıları ile sarılmış betonarme kolon modellerinin davranışını araştırmak için literatüre sunulmuş olan analitik modeller kullanılmıştır. Farklı parametrelerde tasarlanan sargılı kolon modelleri için gerilme-birim şekil değiştirme eğrileri çizilmiş ve elde edilen sonuçlar karşılaştırılarak yorumlanmıştır.Öğe Design Force Estimation Using Artificial Neural Network for Groups of Four Cylindrical Silos(Sage Publications Inc, 2010) Yüksel, S. Bahadır; Arslan, M. HakanThe computation of design forces for the reinforced concrete groups of four cylindrical silos (GFCS) is fairly difficult because of the continuity of the walls between the adjacent silos. In this study, the efficiency of the artificial neural network (ANN) in predicting the design forces and the design moments of the GFCS due to interstice and internal loadings was investigated. Previously obtained finite element (FE) analyses results in the literature were used to train and test the ANN models. Each parameter (silo wall thickness, intersection wall thickness and the central angle spanning the intersection walls of the GFCS) affecting design forces and moments was set to be an input vector. The outputs of the ANN models would be the bending moments, hoop forces and shear forces at the supports and crowns of the interstice walls due to interstice loadings; the maximum axial forces and maximum bending moments at the external walls due to internal loadings. All the outputs of the ANN models were trained and tested by three-layered 11 back-propagation methods widely used in the literature. The obtained results presented that these 11 different methods were capable of predicting the design forces and the design moments at the interstice and external walls of the GFCS used in the training and testing phases of the study.Öğe Modeling and Simulation of Symmetrically Linear Haunched Non-Prismatic Beams Subjected to Temperature Changes(CZECH TECHNICAL UNIV PRAGUE, 2010) Yüksel, S. BahadırWhen the temperature of a structure varies, there will be a tendency to produce changes in the shape of the structure. The resulting actions may be of considerable importance in the analysis of the structures having non-prismatic members. Therefore, this study aimed to investigate the modeling, analysis and behavior of the symmetrically linear haunched non-prismatic members subjected to temperature changes with the aid of finite element modeling. The fixed-end moments and fixed-end forces of such members due to temperature changes were computed through a comprehensive parametric study. The design formulas and the dimensionless design coefficients were proposed based on the comprehensive parametric study using two-dimensional plane-stress finite element models. The fixed-end actions of the non-prismatic members having linear haunches due to temperature changes can be determined using the proposed approach without necessitating a detailed finite element model solution.Öğe Modeling and Simulation of Symmetrically Parabolic Haunched Non-Prismatic Beams Using Finite Element Method(CZECH TECHNICAL UNIV PRAGUE, 2010) Yüksel, S. BahadırNon-prismatic beam members with parabolic haunches are commonly used in bridge and building structures. Due to their non-prismatic geometrical configuration, their assessment, particularly the computation of fixed-end horizontal forces (FEFs) and fixed-end moments (FEMs) becomes a complex problem. Therefore, this study aimed to investigate the modeling and simulation of the non-prismatic beams with symmetrical parabolic haunches (NBSPH) using finite element analyses (FEA). FEFs and FEMs due to vertical loadings were computed through a comprehensive parametric study using FEA. It was demonstrated that the conventional methods using frame elements can lead to significant errors, and the deviations can reach to unacceptable levels for these types of structures. This study advances to propose effective formulas and dimensionless estimation coefficients to predict the FEFs and FEMs with reasonable accuracy for the analysis and re-evaluation of NBSPH.Öğe Soil-Structure Interaction Effects on the Fundamental Periods of the Shear-Wall Dominant Buildings(WILEY, 2012) Balkaya, Can; Yüksel, S. Bahadır; Derinöz, OkanShear-wall dominant reinforced concrete buildings constructed with tunnel-form technique are prevalently constructed in regions with high seismicity due to their ease of construction and inherent resistance to lateral forces. However, the current seismic codes and the design provisions constitute inadequate guidelines for the earthquake-resistance design of these buildings. In particular, the prediction of their fundamental periods via current empirical expressions yields not only erroneous results, but also ignores soil-structure interaction (SSI) effects. For the objective of understanding their dynamic characteristics, a series of eigen analyses is conducted with and without considering SSI effects. The soil effects on foundations are represented by linear translational and rotational winkler springs, and rigidities of the springs are computed from the foundation size and the uniform soil compressibility. An ensemble of 140 different shear-wall dominant buildings with varying heights is simulated in three-dimensions considering four different soil conditions. It is proven that the vibration periods and the mode shapes of the shear-wall dominant buildings may change depending on the different soil conditions. Based on the results of the three dimensional finite element analyses, a set of new empirical equations was proposed to predict the fundamental periods of the shear-wall dominant buildings accounting the SSI effects.
