Browsing by Author "Erdik, Mustafa"

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Evaluation of Wind Power Plants from the Aspect of Earthquake Design
(Turkish Chamber Civil Engineers, 2025) tolga cimilli; Murat Eröz; Cuneyt Tuzun; Mustafa Erdik; Eroz, Murat; Erdik, Mustafa; Cimilli, Tolga; Tuzun, Cuneyt
In recent years Türkiye has steadily invested in renewable energy including wind turbines Conseqently their share in the total generation of energy in the country has been increasing every year. Considering the cost of wind power plants together with the targeted amount of energy generation earthquake planning for these systems becomes crucial. Earthquakes are one of the principal risks of wind energy investments especially when considering the earthquake hazard level in a large portion of the country. Under the present circumstances the companies producing wind turbines conduct the analysis and planning they deem necessary and forward these to the investors in our country. The extent to which manufacturers consider earthquake parameters and analysis methods in the design of wind turbines for earthquake resistance is not well-defined. The lack of clarity makes it difficult for investors to accurately evaluate the suitability of wind turbine tower and foundation designs for the specific conditions of the country. This study evaluates earthquake design methods by investigating the regulations used in the design of wind turbines around the world. The magnitude of ground motion considered in the earthquake design the method of analysis used the load combinations on which the designs are based and the criteria for the designs have been inspected. Moreover the design documents for a wind turbine that is being constructed have been examined in detail with the earthquake design stage being especially scrutinized. Assessments and recommendations have been made regarding the design specifications analysis methods and criteria used in the analysis and design of the wind turbines currently being built in our country. Subsequently obtained recommendations have been taken into consideration to propose an earthquake design procedure for the earthquake design of wind turbines.
Citation - WoS: 6
Citation - Scopus: 9
Near-Fault Earthquake Ground Motion and Seismic Isolation Design
(Springer Science and Business Media Deutschland GmbH, 2023) Mustafa O. Erdik; Bahadır Şadan; Cüneyt Tüzün; Mine Betul Demircioglu-Tumsa; Ömer Ülker; Ebru Harmandar; Erdik, Mustafa; Ülker, Ömer; Şadan, Bahadır; Harmandar, Ebru; Demircioglu-Tumsa, Mine B.; Tüzün, Cüneyt; G.P. Cimellaro
Seismic isolation is one of the most reliable passive structural control techniques with adequately established standards for the earthquake protection of structures from earthquakes. However it has been shown that the seismic isolation systems may not function the best for the near-fault ground motions since in the proximity of a capable fault the ground motions are significantly affected by the rupture mechanism and may generate high demands on the isolation system and the structure. In fact several earthquake resistant design codes state that the seismically isolated structures located at near-fault sites should be designed by considering larger seismic demands than the demand on structures at far-field sites. When the fault ruptures in forward direction to the site most of the seismic energy arrives in coherent long-period ground velocity pulses. The ground-motion prediction equations (GMPEs) typically cannot account for such effects with limited distance metrics and lack adequate data at large magnitudes and near distances. For the reliable earthquake design of the isolated structure in near fault conditions that meets the performance objectives the 3D design basis ground motion(s) need to be appropriately assessed. Measures in the design of the isolation system such as modifications in the stiffness and damping characteristics as well as in the limitation of vertical effects are needed. The behavior of the base-isolated buildings under near-fault (NF) ground motions with fling-step and forward-directivity characteristics are investigated with a rational assessment of design-basis near-fault ground motion are investigated in a parametric format. The parametric study includes several variables including the structural system flexibility, number of stories, isolation system characteristic (yield) strength and the isolation periods related to the post-elastic stiffness. Furthermore the effect of additional damping by viscous dampers were tested for some selected cases. Important findings observed from the parametric performance results and the overall conclusions of the study are provided. © 2023 Elsevier B.V. All rights reserved.