eResearch@Ozyegin
eResearch@Ozyegin is an academic, open-access repository. It aims to collect, preserve and make Ozyegin University’s scientific output available online, without any or the least financial, legal or technical restrictions, in order to increase the impact and the visibility of the institution and its authors. It was established in 2010 to support the dissemination of knowledge produced by the University members to the wider community both locally and globally.
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Recent Submissions
Assessment of seismic liquefaction and structural instability in Adıyaman-Gölbaşı after the February 6, 2023, earthquakes in Türki̇ye
(Elsevier, 2025-05) Ecemis, N.; Donmez, C.; Karaman, M.; Valizadeh, Hadi; Dalgic, K. D.; Civil Engineering; VALIZADEH, Hadı
Two earthquakes, Mw = 7.8 Kahramanmaraş-Pazarcık, and Mw = 7.6 Elbistan, occurred on February 6, 2023, approximately 9 h apart. These earthquakes caused devastating effects in a total of 11 nearby cities on the east side of Türkiye (Adana, Adıyaman, Diyarbakır, Elazığ, Gaziantep, Hatay, Kahramanmaraş, Kilis, Malatya, Osmaniye, and Şanlıurfa) and the north side of Syria. These earthquakes provided an outstanding prospect to observe the effects of liquefaction in silty sand and liquefaction-like behavior in clays (cyclic softening) on the stability of structures. This paper specifically presents the post-earthquake reconnaissance at three sites and evaluations of four buildings within these sites in Adiyaman Province, Gölbaşı District. First, important role of post-earthquake piezocone penetration test (CPTu) in characterizing the subsurface conditions was presented. Then, the effect of soil liquefaction and cyclic softening on the performance of four buildings during the earthquakes was evaluated. These structures represent the typical new reinforced concrete buildings in Türkiye with 3 to 6-story, situated on shallow (raft) foundations, and demonstrated diverse structural performances from full resilience to moderate and extensive damage during the aforementioned earthquakes. Based on the interim findings from these sites, the potential factors that caused moderate to severe damage to buildings were inspected, and preliminary-immediate insights were presented on the relationship between structural design, soil properties, and the performance of buildings with shallow foundations.
Investigation of earth dam filter performance under static and dynamic loading conditions
(ASTM, 2024-09) Valizadeh, Hadi; Ecemis, N.; Sarica Leclerc, R. Z.; Civil Engineering; VALIZADEH, Hadı
Erosion-induced piping is the primary cause of failure in embankment dams’ bodies and foundations. The filter is a principal part of an earth dam, owing to the crucial role of this layer in
protecting the clayey core from erosion. Erosion is the process by which soil particles migrate
due to an interior fluid flow and is recognized as a significant hazard for earthen constructions.
Designing a proper filter-soil system can regulate and seal undesirable cracks that may form in
the impermeable core due to nonuniform settlements, extreme water levels, or earthquakes. In
this study, a No-Erosion Filter (NEF) test device, which still seems to be the most reliable filtersoil system design, has been adapted to evaluate the performance of the filter sand of two
dams under static and dynamic loading conditions. The outcomes were compared with the
several filter design criteria in the literature, and it was found that the filter's design approach
using the available criteria may not always align with the NEF test results. Therefore, a precise
understanding of fluid–particle interactions is necessary to design and operate earth dam
filters. The dynamic excitation can change hole pressure distribution and cause erosion even
after steady-state conditions under static situations. Consequently, the effectiveness of filters
under static conditions does not necessarily translate to satisfactory performance when
exposed to dynamic loading.
Landscape design as art: An experimental methodology with the use of neurographic art and metaball geometry
(International Journal of Built Environment and Sustainability, 2025-01-10) Ağırbaş, Aslı; Sabyrova, R.; Kirhalli, T. E. ; Architecture; AĞIRBAŞ, Aslı
With the use of new technological solutions, non-Euclidean forms can be created in various software platforms and can be produced or fabricated in order to be parts of real world design works. Therefore, new methodology proposals for creation of non-Euclidean forms can be helpful to both designers and design students. In this study, an experimental landscape design methodology which is carried out within the scope of Ozyegin University, Department of Architecture, Architectural Design Studio V and Parametric Design courses, is presented and discussed. Neurographic art is used as a manual art case and metaball script is used as a digital art case of this method. This method has been evaluated and discussed from the perspective of the educators and students. As a result, it has been concluded that the proposed landscape design methodology can be used for the creation of non-Euclidean landscape design forms.