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    Damage assessment, regional ground motion record evaluation, and seismic performance analysis of a high-rise 14-story dual system building after the 2023 Kahramanmaras, earthquakes
    (Elsevier Science Inc, 2025) Peker, Fatma Ulker; Yuzbasi, Julide; Isik, Ercan; Buyuksarac, Aydin; Avcil, Fatih
    On February 6, 2023, T & uuml;rkiye experienced catastrophic Mw 7.8 and 7.6 earthquakes, severely affecting several cities, including Malatya. This study presents a comprehensive structural assessment of a 14-story reinforced concrete building with a symmetric layout in Malatya, one of the cities most impacted by these earthquakes. It uniquely integrates experimental material characterization with advanced seismic nonlinear dynamic analysis (NDA). Unlike conventional post-earthquake studies that rely on visual assessments, this research is distinguished by its data-driven approach. 56 core concrete samples were extracted to determine actual material strengths, and rebar properties were directly measured after removing the concrete cover. These experimentally derived properties were incorporated into a structural model and subjected to seismic performance analysis. The analytical damage predictions closely matched the observed post-earthquake damage, highlighting the importance of accurate material data. Moreover, the study evaluates specifically Malatya's seismic hazard levels by comparing earthquake risk parameters from T & uuml;rkiye's last two seismic codes (TEC-2007 and TBEC-2018) and analyzing regional acceleration spectra. Furthermore, it presents extensive field observations of structural damage to reinforced concrete buildings in Malatya, identifying key vulnerabilities. By integrating real material properties into the numerical model, this research enhances the reliability of predictive models and provides a robust framework for post-earthquake evaluation.
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    Seismic Hazard Implications of the 2025 Balıkesir Earthquake of Mw 6.1 for Western Türkiye
    (Mdpi, 2025) Buyuksarac, Aydin; Avcil, Fatih; Alkan, Hamdi; Isik, Ercan; Harirchian, Ehsan; Ozcelik, Abdullah
    On 10 August 2025, a powerful earthquake (Mw = 6.1) occurred in Bal & imath;kesir, located within the Aegean Graben System, one of T & uuml;rkiye's major tectonic elements, and was felt across a very wide region. This study presents a comprehensive assessment of the seismotectonic characteristics, recorded ground motions, and observed structural performance during this earthquake, focusing specifically on implications for regional seismic hazard assessment. Peak ground acceleration values obtained from local accelerometer stations were compared with predicted peak ground accelerations. The study also conducted comparisons for Bal & imath;kesir districts using the two most recent earthquake hazard maps used in T & uuml;rkiye. Comparative hazard analyses revealed whether existing seismic hazard maps adequately represent Bal & imath;kesir. The findings highlight the need for region-specific hazard model updates, improved implementation of earthquake-resistant design rules, and targeted retrofit strategies to mitigate future earthquake risk. The methodology adopted in this study involved comparative hazard analysis using the last two seismic hazard maps, evaluation of PGA's across 20 districts of Bal & imath;kesir Province, and a field-based survey of structural damage. This integrative approach ensured that both seismological and engineering perspectives were comprehensively addressed.
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    Technical and Socio-Economic Perspective on the Disaster of the Century (6 February 2023 Earthquake) in Türkiye on the Second Anniversary
    (Wiley, 2025) Aydin, M. Cihan; Isik, Ercan; Buyuksarac, Aydin; Ulu, Ali Emre; Avcil, Fatih
    The two earthquakes of magnitude 7.7 and 7.6 that struck southeastern T & uuml;rkiye on 6 February 2023 have been dubbed the 'disaster of the century' due to their catastrophic impact on the country and society. The shockwaves of the two earthquakes, which were centred in Kahramanmara & scedil; and resulted in more than 50,000 deaths, not only devastated 11 provinces but were also strongly felt in neighbouring countries. In addition to the destruction caused by the earthquake, which directly affected approximately 14 million people, its psychological and socio-economic consequences on the Turkish and Syrian populations are likely to continue for many years. This study offers a comprehensive technical and socio-economic perspective on the earthquake-affected region on the second anniversary of the disaster. It also provides insights into the seismotectonics of the earthquake zone and the resulting structural damage. By enhancing the understanding of the socio-economic impacts of the devastating Kahramanmara & scedil; earthquakes, this study aims to contribute to the development of safer and more resilient societies.
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    The effect of local soil conditions on structure target displacements in different seismic zones
    (2022) Avcil, Fatih; Işık, Ercan; Büyüksaraç, Aydın
    The local soil conditions of the region where the structure is located are one of the important parameters taken into account in the evaluation and design of structures under the influence of earthquakes. In this study, the effect of different local soil conditions on target displacement values of reinforced-concrete (RC) structures in different seismic regions was investigated. For this purpose, four different settlements within each earthquake zone specified in the previous earthquake zone map were taken into account. Structural analyzes for a sample reinforced concrete structure using four different local soil conditions were performed for all residential units separately. The values predicted in the current earthquake hazard map for the considered locations were repeated for four different local soil classes. For the settlements, the predicted values in the last two maps were compared. As the soil properties improved as a result of the structural analysis, the displacement values predicted for the building performance level took lower values.