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CFRP Effect on the Buckling Behavior of Dented Cylindrical Shells
Abdulkadir Cüneyt Aydin,Zeynep Yaman,Elif Ağcakoca,Mahmut Kiliç,Mahyar Maali,Ali Aghazadeh Dizaji 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.2
Considering that the use of thin-walled shells is expanding every day, it is important to examine the problem of instability in this form of structure. Many steel structures such as high-water tanks, water and oil reservoirs, marine structures, and pressure vessels, including shell elements, are under stress tension. In addition, shell elements are subject to instability owing to the loads applied. Ten thin-walled cylindrical shell specimens in two groups with different dent depths of tc and 2tc, and the different dent number subject to uniform external pressure were tested in the present research (tc is the thickness of cylindrical shell). The samples were modified to include either one or two dent line with amplitudes of h/3 in height (h the height of cylinder shell). Moreover, CFRP Strips on the dent depth was used in one of the groups. The results of testing under different theories and codes are compared.
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.