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- 검색키워드
- 저자 : Mahmut Kılıç (검색결과 5 건)
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Buckling Behavior of Nose Cone Type Steel Tanks Including Horizontal Imperfection
Mahmut Kılıç 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.4
Cylindrical shells have long been used as storage tanks in small or large sizes to store a variety of materials such as petroleum and derivatives. The radius to thickness ratios of these shells are classifi ed as 1000 and 2000 according to which designers and international codes are attracted to the buckling due to their collapse in buckling. Considerable research has been conducted on cylindrical reservoirs under the infl uence of a hydrostatic force or an internal vacuum. Due to the low wall thickness of the shell structures, it is possible to cause any deformation and disturbance on the wall surfaces. Due to a variety of errors during construction or assembly, the designed tanks are not ideally constructed and have some geometric error. Horizontal imperfection caused by continuous welding on the steel sheet’s edge to form the nose cone is the main concern of this work. The present paper attempts to discuss seven laboratory specimens under uniformed hydrostatic pressure with the 4t, 6t, 8t, 10t, 14t and 24t depths. The results revealed that there is a descent agreement between the results of the experiments conducted here and international codes and theories concerning with initial and overall buckling and collapse.
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Dilşad Yıldız Miniksar(Dilşad Yıldız Miniksar ),Mehmet Akif Cansız(Mehmet Akif Cansız ),Ayşe Yeşim Göçmen(Ayşe Yeşim Göçmen ),Mahmut Kılıç(Mahmut Kılıç ),Ökkeş Hakan Miniksar(Ökkeş Hakan Miniksar ) 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.1
Objective: The aim of this study was to determine the correlation between clinical variables such as body mass index, blood pressure, drug use and oxidative stress level in children and adolescents with attention deficit and hyperactivity disorder (ADHD). Methods: Total oxidant status (TOS), total antioxidant status (TAS), oxidative stress index (OSI), malondialdehyde (MDA) and superoxide dismutase (SOD) activity were measured in the serum of 51 patients (38 male, 13 female) diagnosed with ADHD according to DSM-5 diagnostic criteria and 32 control subjects (12 male, 20 female). The Kiddie Schedule for Affective Disorders and Schizophrenia Present and Lifetime Version was applied to all participants. Results: The mean TOS, OSI, MDA values were determined to be significantly higher (p < 0.001) and the mean SOD value was lower in the ADHD group (p < 0.001). Multivariate regression analysis indicated significantly lower SOD and diastolic blood pressure values and significantly higher MDA in the ADHD group compared to the control group (p < 0.01). Low SOD (sensitivity 90.2%, specificity 78.0%) and high MDA (sensitivity 86.3%, specificity 81.2%) were determined to be predictive parameters for diagnosing ADHD. In univariate analysis, the mean TOS, OSI and SOD values were higher in ADHD patients under medication, while the mean TAS was higher in patients not using medication (p < 0.01). Only TOS was significant in multivariate logistic regression analysis (p < 0.01). Conclusion: The results of this study demonstrate that impaired oxidative balance may play a role in the etiology of ADHD.
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The Confinement Effect on the Buckling Performance of Cylindrical Tanks
Mahyar Maali,Mahmut Kılıç,Aydin Abdulkadir Cüneyt 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.2
Thin-walled cylindrical tanks are used in many civil engineering applications. In the past ten years, various methods have been used to confinement the cylindrical tanks; one of these methods is using CFRP. In this study, the tanks were confinement by using CFRP (The CFRP confinements were decided for 50 mm in width) in two different ways (Spiral (S) and horizontal (H)) at different distances (100,200 and 300 mm), and the effect of CFRP on the buckling capacity was examined. The models present how the spiral and horizontal CFRP confinement can improve buckling capacity. Results show that the gradual decreases in the initial, overall, and collapse buckling loads resulted from increasing CFRP strip distance of 100 mm to 300 mm in the two groups. Also, the results observed are generally by some of the international standards and the theories related to buckling.
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A Novel Approach for Bolted T-Stub Connections
Merve Sağıroğlu,Mahyar Maali,Mahmut Kılıç,Abdulkadir Cüneyt Aydın 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.3
This paper reports an investigation into new connection types and their behaviors determined using full-scale experiments. T-shaped connections were created using the IPE standard profi le. The aim of this study was to analyze the infl uence of T connections based on the IPE standard profi le, height of beam to height of T-stub joint (H) of T-stub joints, and lengths (X) of T-stub joints on the behavior of steel connections, in order to provide the necessary data for improving Eurocode 3 and enable effi cient use of residue IPE standard profi les and back to the consumption cycle. While the moment resistance values increased with an increase in H from H min to H max in model groups with X of 126 mm, and the energy dissipation increased with an increase in H from H min to H max and also with an increase in the lengths (X) of T-stub joints from 54 to 126 mm.
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Experimental Model of the Behaviour of Bolted Angles Connections with Stiffeners
Abdulkadir Cüneyt Aydın,Mahyar Maali,Mahmut Kılıç 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.3
This paper presents the experimental results of twenty full scale specimens of steel bolted connections beam-to-column with top-and-seat angles in six groups, labelled L91-tp8, L82-tp8, L73-tp8, L91-tp10, L82-tp10 and L73-tp10 groups (L=length of top-and-seat angle, tp=stiffener thickness of top-and-seat angle), under static loading. This study was undertaken to analyse the influence of angles and beams with stiffeners on the behaviour of the beam-to-column joints. The main parameters observed are the evolution of the resistance, the stiffness, the rotation capacity, the ductility of a joint, and the energy dissipation capacity. The aim was to provide necessary data to improve the Eurocode 3.
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