Yazar "Altunisik, Ahmet Can" seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Evaluation of earthquake-related damages on masonry structures due to the 6 February 2023 Kahramanmaras,-Türkiye earthquakes: A case study for Hatay Governorship Building(Pergamon-Elsevier Science Ltd, 2024) Kahya, Volkan; Genc, Ali Fuat; Sunca, Fezayil; Roudane, Boudjamaa; Altunisik, Ahmet Can; Yilmaz, Semin; Gunaydin, MuratThe present study contributes to enriching the sparse literature on the seismic analysis of historical masonry buildings through field observations and advanced computational tools. To do this, the findings from field observations in the area affected by the February 6th, 2023, Kahramanmaras, earthquakes (Mw = 7.7 and Mw = 7.6) are evaluated to point out the possible reasons for damages occurred in masonry buildings. Further, numerical simulations of a historical building in Hatay which has a significant amount of historical masonry building stock in the region. Comparisons of the results obtained from non-linear finite element analyses and field observations are made to explain the crack patterns occurred and damage mechanisms. Nonlinear finite element analyses confirmed that the considered structure did not collapse despite being seriously damaged in the first two earthquakes (Mw = 7.7 and Mw = 7.6), but a part of it completely collapsed because of the third earthquake (Mw = 6.4) on February 20th, 2023, in Defne district. The damage patterns observed in the field are also obtained exactly by the numerical simulations. Some retrofitting proposals are given to assist the authorities in charge of the reconstruction and rehabilitation programs to account for a better interpretation and under-standing of the seismic performance of masonry buildings.Öğe Field Investigation on Reinforced Concrete and Masonry Buildings Damages after November 23, 2022 Golyaka (Duzce) Earthquake(World Scientific Publ Co Pte Ltd, 2023) Aykanat, Batuhan; Erturk, Esin; Altunisik, Ahmet Can; Aslan, Mehmet EminA strong earthquake with a moment magnitude of Mw=5.9 according to the Disaster and Emergency Management Authority (AFAD) occurred at 04:08 local time on November 23, 2022, in Golyaka district of Duzce province that is located in the Western Black Sea region of Turkey. The earthquake with a shallow focus is 0.82 km away from Kemeryani village of Golyaka district, which is the nearest settlement. According to observation data, the highest acceleration value of the earthquake was measured as 407.76 gal (0.410 g) in the East-West component measured from the 8102 coded Duzce Central accelerometer station, which is one of the five accelerometer stations closest to the earthquake zone. There was no loss of life in the earthquake, in which 93 people were injured. However, damages occurred due to the earthquake in structures that were built before the year 2000 and did not receive good engineering and supervision services. It has been determined that the structures built after the year 2000 received good engineering and supervision services performed better. The purpose of this study is to ensure that the experience gained as a result of the investigations about the earthquake that occurred will be made permanent and usable. For this purpose, damage and collapses that occurred on the buildings due to earthquake are examined based on field investigation. The types and causes of damage that occurred on both reinforced concrete and masonry buildings are evaluated in detail with considering the conditions of the existing Turkey Building Earthquake Design Code. The seismological characteristics of the earthquake are also evaluated. In addition, the earthquake hazard of Duzce Province is evaluated together with the earthquakes experienced in the past years, which caused significant loss of life and property in the region.Öğe Field Observations and Damage Evaluation in Reinforced Concrete Buildings After the February 6th, 2023, Kahramanmaras-Turkiye Earthquakes(World Scientific Publ Co Pte Ltd, 2023) Altunisik, Ahmet Can; Arslan, Mehmet Emin; Kahya, Volkan; Aslan, Banu; Sezdirmez, Tugrul; Dok, Gokhan; Kirtel, OsmanOn February 6, 2023, two major earthquakes (Mw 7.7 and Mw 7.6) occurred in the province of Kahramanmaras in southern Turkiye at 9-h intervals, causing a lot of loss of life and destruction in the region where approximately 16% of the country's population lives. This study provides a comprehensive summary of common structural deficiencies that occurred in reinforced concrete (RC) buildings in earthquake-prone cities and proposes actionable measures systematically for future disasters. The evaluated data are based on the field observations of the authors. The main reasons for damages in RC buildings in the observation field can be classified into two categories: (1) the errors during the design stage (strong beam-weak column, short column, soft story, pounding effects, the existence of short and unconfined lap splices, insufficient transverse reinforcement, column-beam connection failures), and (2) the errors during the construction stage (poor concrete quality, unribbed reinforcing steel bar and corrosion, incorrect placement of reinforcement bars, incorrect end hook angle and length, weak gable walls, workmanship defects). Furthermore, a comparative nonlinear finite element analysis of the seismic impacts caused by the first earthquake on an existing RC building fully collapsed in the earthquake was conducted as a case study considering Turkiye Building Earthquake Code 2018 [TBEC 2018] Turkiye Bina Deprem Yonetmeligi, Afet ve Acil Durum Yonetimi Baskanligi, Ankara (in Turkish)]. The validity and accuracy of the reasons for damages, which were reached by the field observations, were also proven by numerical analysis results. The importance of complying with the regulations, conducting the performance evaluations and controls of the buildings according to the renewed earthquake regulations and, if necessary, repairing-strengthening works were emphasized. The loss of life and property after the earthquakes that we experienced on February 6, 2023, which were called the Disaster of the Century, showed that Turkiye's current building stock, especially those built before a certain date, is insufficient against earthquakes.Öğe Field Observations and Numerical Investigations on Seismic Damage Assessment of RC and Masonry Minarets During the February 6th, 2023, Kahramanmaraş (Mw 7.7 Pazarcık and Mw 7.6 Elbistan) Earthquakes in Türkiye(Taylor & Francis Inc, 2024) Atmaca, Barbaros; Atmaca, Esin Erturk; Roudane, Boudjamaa; Gules, Osman; Demirkaya, Eren; Aykanat, Batuhan; Altunisik, Ahmet CanOn February 6, 2023, two massive earthquakes struck the EasternAnatolian Fault Line (EAF) at 9-hour intervals. The Mw 7.7 and Mw 7.6 earthquakes were located in Pazarcik and Elbistan districts inKahramanmaras province. These earthquakes directly damaged 11 provinces in Eastern and Southeastern Anatolia (Kahramanmaras,Hatay, Adyaman, Osmaniye, Gaziantep, Sanlurfa, Malatya, Diyarbakir,Adana, Kilis, and Elazig), causing substantial loss of life and property. This study aims to present the field investigation of reinforced concrete (RC) and masonry minarets in 11 cities around the area after these earthquakes and the structural performance and collapse mechanism of two minarets selected as case studies. For this purpose, the damaged or collapsed minarets in the region affected by the earthquakes were determined and the reasons were explained. In addition, an RC and a masonry minaret in the Islahiye district were chosen as case studies, and finite element models (FEM) were created.The validity and correctness of the reasons for damages determined by field observations were further demonstrated by numerical findings.It was determined that nearly all of the damaged and collapsed minarets did not obtain proper engineering services. Additionally, it is believed that the lack of any norms or regulations for these unique constructions is a significant weakness that places engineers in a challenging situation throughout the design phase
