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Öğe Multiscale analysis of active state failure behind a retaining wall(International Society for Soil Mechanics and Geotechnical Engineering, 2019) Soltanbeigi, Behzad; Altunbaş, Adlen; Çinicio?lu, ÖzerDiscrete element method (DEM) simulates the interaction of particulate material by tracking the displacement and calculation of force for individual grains. Current study, initially simulates the active state failure behind a retaining wall for a cohesionless backfill. The considered particles are differentiated by shape parameter; both spherical and non-spherical particles are included. Additionally, a physical lab-scale model retaining wall that can reproduce active state failure is utilized in this study. Tests are performed on a uniformly graded local sand (Akpinar sand). The model has transparent wall which will allow the observation of the deformation during the test. Eventually, failure surface evolution from DEM simulations is compared qualitatively to those of experimental observations. Obtained results suggest that it is crucial to incorporate non-spherical particles for DEM simulations to enable realistic representation of a granular backfill.Öğe Structural strengthening of RC buildings for enhanced seismic resistance(Springer Science and Business Media Deutschland GmbH, 2021) Güneş, B.; Coşgun, T.; Mangır, Atakan; Sayın, B.This study aims to present a strengthening technique for the seismic resistance of existing reinforced concrete (RC) buildings subjected to earthquake effects. The entire process is illustrated with a case study of an existing RC building. In this study, the building is examined with field surveys and numerical analyses. In the first stage, the damage assessment of the building was done with visual inspection and observation of structural members, and then the seismic performance of the examined RC building was determined using a nonlinear analysis method. Accordingly, a strengthening technique is comprehensively presented for this building, which was determined to be seismically insufficient. The enhancement achieved for the sufficient seismic strength is discussed by numerical comparisons considering the analysis results of the structural model that includes the strengthening members proposed in the presented technique. The presented research is important in terms of the numerical determination of the current state of similar RC buildings against the seismic effects, and to verify the feasibility of the proposed strengthening technique.Öğe Seismic performance of existing RC framed buildings using pushover analysis method(Springer Science and Business Media Deutschland GmbH, 2021) Güneş, Barış; Coşgun, Turgay; Mangır, Atakan; Sayın, BarışThe aim of this study is to present a methodology on the determination of the seismic performance of existing reinforced concrete (RC) structures subjected to earthquake effects. This paper focuses on the assessment of existing RC structures with a nonlinear analysis (pushover analysis) method. The research is presented with the case study of an existing RC structure. The investigations on this RC structure is done with the field surveys, lab studies and numerical analyses. The first stage of the study includes the assessment of the compliance between the architectural and structural design projects of the related structure. Necessary checks have been made whether the projects of the structure are consistent with its existing state. Secondly, on-site mechanical tests were conducted on the structural members, and laboratory tests were performed on the samples collected from the structure. In the last stage, the seismic performance of the structure was determined based on the three-dimensional finite element model prepared for the existing state of the structure. The analysis results are discussed considering the target performance level parameter. The results have shown the importance of designating the appropriate target performance level in the evaluation of the seismic performance of RC structures.Öğe Improving of the angstrom-prescott model using harmonic analysis(Springer Verlag, 2018) Güçlü, Yavuz Selim; Dabanlı, İsmail; Şişman, Eyüp; Şen, ZekaiThe solar energy as one of the most important energy sources is investigated for effective use in a variety of areas. Especially, with the tendency of depletion of fossil fuel consumption as well as their greenhouse gas emissions leading to atmospheric pollution and, hence, global warming and climate change, the value of renewable energy sources and solar energy is increasing rapidly. In the solar energy prediction, the relationship between solar irradiation and sunshine duration plays the most dominant role. The aim of this study is to apply harmonic analysis, coupled with the classical Angström-Prescott equation, to solar irradiation and sunshine duration data for the extraction of its relevant relationship. Firstly, it helps to eliminate the periodicity from the measurement record and then the application of the Angström-Prescott model is applied, which is then tested and compared with the classical Angström-Prescott model based on the regression approach. The applications are achieved by use of measurements at the major city in the south-eastern Anatolian part of Turkey, namely, Diyarbakır. The improved model provides more successful and reliable outputs than the classical approach.
