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Sürdürülebilir Kalkınma Amaçları

• 2

• BildiriYalnız künye2026/r/gumushane/13531
  Dynamic Analysis of a High-Rise Building Under Near-Fault and Far-Fault Loads Considering Soil-Structure Interaction

  Kaya, Dilek; Cakir, Tufan; Ozturk, Kasif Furkan

  Earthquakes that have occurred in our country and various countries around the world over the past 30 years have clearly indicated that the complex relationship between the soil, structure, and earthquake requires further research. This situation has shown that building behavior under dynamic loads can vary depending on parameters such as structural geometry, foundation soil system characteristics, and earthquake characteristics. Due to the fact that near-fault movements contain higher accelerations and higher velocity components compared to far-fault movements, high-rise structures may exhibit relatively more sensitive behavior under such loads and may be negatively affected by these earthquake contents. In this context, the aim of this study is to investigate the dynamic behavior of a 12-story building system under near-fault and far-fault ground motions, taking into account different soil properties. To this end, three-dimensional finite element models were first created for the 12-story building system, considering both fixed and flexible foundation conditions. Modal analyses were performed using finite element models created with ANSYS software, and the obtained mode periods were compared with those obtained from analytical models. Subsequently, the dynamic behavior of the 12-story building system was investigated using relative displacement, stress, and acceleration responses obtained from time-domain analyses conducted for different soil systems and fixed foundation conditions. Comparisons of the dynamic responses showed that the structural dynamic responses could be influenced not only by the soil-structure interaction system but also by nearby and distant fault earthquakes.

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• Doktora TeziAçık Erişim2025/r/gumushane/21611
  Farklı narinlik oranlarına sahip yapıların dinamik davranışı üzerinde zemin özelliklerinin ve temel gömülme derinliğinin etkisi

  Dilek Kaya

  Zemin-yapı etkileşimi (ZYE), sismik performansın özellikle zemin koşullarına bağlı olduğu yüksek binalar, barajlar, köprüler, nükleer santraller, silolar, bacalar ve su depoları için kritik öneme sahiptir. Ayrıca gömülü yapılarda, gömülme; zemin-yapı sisteminin periyodunu, rijitliğini, sönüm kapasitesini ve tepkilerini değiştirebilmektedir. Bu çalışmanın temel amacı; ZYE dikkate alınarak yapıların dinamik davranışı üzerinde narinlik oranının (2, 4 ve 6), zemin koşullarının, temel gömülme oranının (0, 0.5, 1 ve 1.5) ve deprem frekans içeriğinin (2 yüksek, 2 orta ve 2 düşük) tesirlerini irdelemektir. Bu amaçla, zemin-yapı sistemlerinin sonlu eleman modelleri oluşturulmuş ve bu modellerin kullanılabilirliği altsistem yaklaşımları vasıtasıyla gösterilmiştir. Sismik çözümlemeler gerçekleştirilmiş ve rölatif yer değiştirmeler, göreli kat ötelemeleri, gerilmeler ve ivmeler irdelenmiştir. Narinlik oranının artmasının ve yumuşak zemin koşullarının periyotları uzattığı ve yer değiştirmeler ile göreli kat ötelemelerini belirgin bir şekilde artırdığı görülmüştür. Gömülme oranının artmasıyla, yer değiştirme ve gerilmelerde genel olarak azalma gözlenmiştir. Zeminin yumuşamasıyla iç kuvvet tepkilerinin her zaman azalma eğiliminde olmadığı ve birçok parametrenin birleşik etkisi nedeniyle zemin yumuşamasının iç kuvvet tepkilerini artırma potansiyeline de sahip olduğu belirlenmiştir. Sonuçlar, sismik davranışın bir tek parametre tarafından kontrol edilemeyeceğini ve zemin türü, deprem frekans içeriği, gömülme oranı ve narinlik oranı arasındaki karşılıklı etkileşimin tepkiler üzerinde beklentilerin aksine etkiler yaratabileceğini ortaya koymuştur.

  İncele
• MakaleYalnız künye2025/r/gumushane/11720
  Effect of frequency content of ground motion on seismic response of buildings with variable aspect ratio including soil-structure interaction

  Kaya, Dilek; Cakir, Tufan; Ozturk, Kasif Furkan; Araz, Onur

  Soil-structure interaction (SSI) may lead to reduction, amplification or negligible change in structural responses depending on the relationship between the nature of excitations and subsoil conditions. Since neglecting SSI effects may cause uncertainties in seismic design, it is crucial to consider them during the design process. Another important factor affecting the dynamic behavior of structures interacting with the ground is the dynamic properties of the structures. To consider this effect, three buildings with 4, 8, and 12 stories designed in accordance with the Turkish Building Earthquake Code (TBEC-2018) are analyzed. The aspect ratios of these structures are 2, 4, and 6, corresponding to squat, ordinary, and slender structures, respectively. The primary objective of this study is to simulate the combined effects of these key parameters on the dynamic response of reinforced concrete structures. In the time history analyses, six ground motions classified by three different frequency contents are considered. 3D finite element models of SSI systems are established using ANSYS software. The usability of the numerical models is demonstrated for both SSI and fixed-base cases through three different analytical approaches. The displacement, acceleration, and stress responses are examined through time history analyses. The results indicate that the SSI is not negligible and neglecting the SSI is an oversimplification that does not lead to always-conservative predictions. Moreover, both the frequency content of the excitation and the structural aspect ratio are found to be decisive parameters in seismic response.

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  İncele
• MakaleYalnız künye2023/r/gumushane/14374
  Effect of foundation embedment ratio in suppressing seismic-induced vibrations using optimum tuned mass damper

  Araz, Onur; Cakir, Tufan; Ozturk, Kasif Furkan; Kaya, Dilek

  Tuned mass damper (TMD), which is used in structures to mitigate the dynamic responses caused by environmental loads, is tuned according to the dominant frequency of the structures. The dominant frequency of structure built on soil with low stiffness is significantly affected by the soil-structure interaction (SSI). In previous studies, only the surface foundation case is considered to investigate the design parameters of TMD considering SSI effects and the embedment depth of the foundation is neglected in these studies. Thus, this paper investigates the optimization of TMD for mitigation of responses of a high-rise building considering various depths of embedment and soil properties. The optimum parameters of TMD are investigated using five different optimization algorithms (i.e., simulated annealing, sequential quadratic programming, genetic algorithm, pattern search, and particle swarm optimization). The objective function minimizes the peak acceleration amplitude at the top of the structure. The effectiveness of optimum TMD is verified to use 20 near-fault pulse-like ground motions. The comparisons show that the embedment ratio of the foundation and the soil properties significantly affect the optimization of TMD.

  İncele
• MakaleAçık Erişim2023/r/gumushane/12792
  Geographic information system approach in evaluating the geotechnical properties of soils: A case study of Oymaağaç in Kayseri; [Zeminlerin geoteknik özelliklerinin değerlendirilmesinde coğrafi bilgi sistemi yaklaşımı: Kayseri Oymaağaç örneği]

  Acar, Mehmet Cemal; Kaya, Dilek

  Kayseri, the ninth biggest city in Turkey, the regions opened to the ongoing construction of residential areas are expanding rapidly parallel to population growth. Soil improvement works are carried out in areas with the poor bearing capacity of foundations and in regions that are not suitable for safe construction. This event causes severe economic losses in urban development. This study proposes a (Geographic Information System) GIS-based approach to comprehensively understand the research area's underground conditions, predetermine the zones opened for construction by considering the parameters affecting the foundation of the buildings, and create an informative geotechnical model with visualization technology. For an exemplary application, a database was created with ArcGIS in the Kayseri Oymaağaç location, and geological and geotechnical data were combined. The soil properties of this one million five hundred thousand square meter area opened for new settlement were analyzed in a GIS environment. The variation of SPT-N values measured in 60 boreholes in the field with depth, soil types, groundwater levels, and Vs data were used to combine the data, and related maps were drawn. Then, maps of the liquefaction of the soil in a possible earthquake and visual maps showing the bearing capacity of the foundations were created. This study will offer the best and most reliable land-use scenarios and in situ soil properties to decision-makers such as engineers, government agencies and disaster management. It will contribute to making accurate and fast decisions in urban planning. In addition, it will also be able to use as a tool for risk management in emergencies.

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