Cylindrical steel tanks are widely used to water store and for cooling in nuclear power plants. The seismic behaviour of liquid storage tanks is very complicated due to the hydrodynamic pressures of the fluids in them. In this paper, the epoxy-carbon coating method is suggested to improve of seismic performance of cylindrical steel tanks. Composite epoxy-carbon materials are widely used for winding thin walled cylindrical steel structures. After tank had coated with epoxy-carbon composite material, it was observed that Equivalent (von-Mises) stresses significantly decreased. The maximum hoop stress in the unprotected tank is 81.92 MPa, while the maximum stress is reduced to 44.77 MPa after it was coated with the epoxy-carbon.
Cylindrical steel tanks are widely used to store variety liquids such as water, petroleum, and industrial chemicals. They also have been becoming widespread for cooling in nuclear power plants last years. Steel liquid tanks can be exposed during earthquakes and also they can cause great financial and environmental damage with their containing petroleum or other hazardous chemical liquid. Explicit Dynamic tool in ANSYS Workbench reveals accurate results in dynamic analysis of structures under instantaneous and short forces. The Explicit Dynamic tool uses Eulerian Body with water to provide interaction between the water and the shell. El-Centro earthquake 0,22 seconds data was used as displacement force for to see the shear stress on the tank. The tank was covered with epoxy carbon material using the Workbench ACP tool to reduce shear stress.
Modern Frame Systems have appeared by development of frame systems due to search for optimum cost and quality of construction, along with the increased number of multi-storey concrete construction today. Although the initial investment costs of the modern frame systems are high, there use has increased 50100 times with respect to the traditional methods. With the modern frames, reduction or complete elimination of extra operations, such as cutting and sizing on site, have led to savings on workmanship and time. These systems aim at providing wide range of application in a short time by using minimum workmanship and, consequently, maximum number of application. This study explores, experimentally and numerically, the bending strength of wooden and plywood panels most frequently used for the construction today.
Cylindrical steel storage tanks are widely used for the storage of various liquids, industrial chemicals and firefighting waters. They have also been used for cooling purposes in nuclear power plants in recent years. Liquid-storage tanks have many different configurations; however, in this study, cylindrical ground-supported liquid steel tanks were preferred because of simplicity in their design and construction as well as their efficiency in resisting applied hydrostatic and hydrodynamic loads, when compared with other configurations. If liquid steel tanks are damaged in an earthquake, they can also cause great financial loss and environmental damage due to their hazardous chemical contents. These tanks may be exposed to several types of failures such as elephant-foot buckling, diamond-shape buckling, overturning and uplifting during earthquakes. The aim of this study is to compare the deformity states of cylindrical steel tanks with three different roof shapes. For this reason, dimensions of the cylindrical open-top, flatclosed and torispherical-closed top tanks were determined for 3D-finite element method (FEM) models in an ANSYS workbench software. This article focuses on the seismic-activity-resistant ground-supported cylindrical (vertical) steel liquid storage tanks. Seismic analyses were conducted under Kobe earthquake loads. The free vibration frequency values calculated using API 650 (American Petroleum Institutes) were verified with the FEM results. Directional deformation and buckling were presented for both impulsive and convective regions. According to API 650 standard, the tank shell thickness is 6 mm. Analyses were performed for tanks with 4 mm and 8 mm shell thickness. In this study, directional deformation and buckling were observed in models with shell thickness under the standard (4 mm) and above the standard (8 mm), unlike the earlier studies in the literature. It was also observed that increasing shell thickness above the specified code values the deformation in the flat-closed tank. In addition, torispherical dome-shaped tanks were observed to have smaller directional deformation and buckling in all cases considered.
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