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YAZICI, GÖKHAN

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Dr. Öğr. Üyesi

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YAZICI

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GÖKHAN

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2020 - 20223
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End date: 2022Start date: 2020

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Now showing 1 - 3 of 3
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    PublicationRestricted
    Failure of the Maintenance Gantry of a Metro Crossing Bridge
    (Pergamon-Elsevier Science Ltd., 2020) Vatansever, Cüneyt; YAZICI, GÖKHAN; SEÇKİN, EDİP; Alçiçek, Haluk Emre
    This paper investigates the failure of the underdeck maintenance gantry of the metro crossing bridge in Istanbul, Turkey on January 4, 2014, which resulted in the injury of four workers. First, a brief description of the gantry and the bridge has been provided, which is followed by the findings of the on-site investigation which involved the review of the video record of the incident, interviews with the field staff, overview of the project drawings and the investigation of the parts of the collapsed gantry. Additionally, the finite element model of the part where the collapse initiated was created and loaded in accordance with the operation procedures of the gantry during the incident. Finally, on-site investigation and finite element analysis results revealed that collapse of the gantry occurred by exceeding the shear capacity of the bolts in the connections. Moreover, the exceedance of the shear capacity was the consequence of unexpected operating practices used by the workers during the incident, which caused unforeseen shear stress concentration in the bolts.
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    PublicationOpen Access
    Gömülü Betonarme Boruların Analitik ve Sayısal Yöntemler ile Tasarımı
    (Turkish Chamber Civil Engineers, 2022) Demirci, Onur; Kılıç, Havvanur; YAZICI, GÖKHAN
    Gömülü betonarme borular, kentsel altyapının kritik bileşenleridir. Tasarımlarında, boru özellikleri, boruyu çevreleyen dolgu zemin, yataklama koşulları ve etki eden dış yükler dikkate alınarak ampirik veya sayısal yöntemler kullanılır. Bu çalışmada, uygulamada yaygın olarak kabul gören ampirik ve sayısal analiz yöntemleri dikkate alınarak yapılan tasarım hesaplarındaki farklılıklar geri dolgu malzeme türü, dolgu yüksekliği ve boru çapı değişimi dikkate alınarak parametrik analizler ile incelenmiştir. Çalışma sonuçları, sayısal analizlerde zemin-boru etkileşiminin gerçekçi olarak dikkate alınması nedeniyle hesaplanan gerekli donatı alanlarının geleneksel tasarım yöntemlerinden elde edilen değerlere göre daha düşük olduğunu göstermektedir.
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    PublicationOpen Access
    Calculation of Pile Capacity in Cohesionless Soil by CPT Considering Spatial Variability
    (Çukurova Üniversitesi Mühendislik Fakültesi, 2021) MERT, AHMET CAN; YAZICI, GÖKHAN
    The study aims to construct a framework for CPT based ultimate pile capacity calculation for cohesionless soils with random field theory. Cone tip resistance (qc) was taken as the spatially varying parameter with a constant mean and changing coefficients of variation. CPT profiles were simulated with random field generations, and the ultimate capacity of a single pile (Qu) was calculated with these simulations. The influence of spatial variation of qc on the variation of Qu was investigated. The proposed framework was finally verified by comparing the results of an actual CPT database and the simulated CPT profiles in the study. The results showed that the critical vertical scale of fluctuation for CPT-based pile capacity calculations was equal to one diameter of pile (dv=1D), and that the method effectively predicted the ultimate pile capacity through simulated CPT profiles with random field. The proposed method is especially recommended for cases where the uncertainty consideration is necessary, yet the site-specific data is limited. The study aims to contribute a simple framework to the methods of CPTbased pile capacity with unceratinty consideration. The propesed method aims to facilitate the pile design framework with limited available data.