Mühendislik Fakültesi / Faculty of Engineering

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Browsing Mühendislik Fakültesi / Faculty of Engineering by Publisher "AMER SOC MECHANICAL ENGINEERS, THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA"

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    Dynamic behaviour of seismically isolated cylindrical offshore storage tanks
    (AMER SOC MECHANICAL ENGINEERS, THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA, 2005) Mastanzade, Nijat; YAZICI, GÖKHAN
    Cylindrical offshore storage tanks are mainly used to store critical liquids such as petroleum and LNG. Failure of these tanks after an earthquake not only results in high financial losses but can also create an environmental disaster as well. Seismic isolation technique has been utilized in this study to mitigate the damaging effects of lateral earthquake forces. In this study, seismic isolation is used in cylindrical offshore storage tanks. Seismic isolators are protected from the marine environment by a water-proof flexible membrane that allows the horizontal movement of the tank. The mathematical model takes the following into account: mass of the stored liquid, added mass of the water surrounding the tank, horizontal stiffness and damping of the isolation system. Internal forces due to the hydrostatic and hydrodynamic forces acting on the system during an earthquake have been calculated by using the shell-moment theory. The results of the analyses are compared for both the isolated and fixed-base tanks.
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    VORTEX SHEDDINGS ON THE INSTABILITY AT SUBSEA SUSPENDED PIPELINE
    (AMER SOC MECHANICAL ENGINEERS, THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA, 2008) Mastanzade, Nijat; Yılmaz, Levent; TR153142
    The underwater suspended pipeline was investigated for the lateral vibration which is applied for the oscillation of the pipeline part for vortex shedding. Firstly it is defined the tension force at the connection legs on the sea bottom. For definition of the dynamical equation it is used the analogy of the Mathieu Equation. For solution it is used Ince-Struut Diagram. As numerical example it was used the pipeline behavior at the project between Turkey and North Cyprus at the East Mediterranean Sea. In this research the theoretical background is compared with the experimental data of Danish Hydraulic Institute. It shows the good agreement.