Double bottom is one part of the ship’s construction which is located at the bottom and it functioned to overcome when the ship collides with the other object at the outer of ship’s bottom. One of the parameters of the double bottom that must be considered is double bottom height. These would affects to the section inertia, section modulus and neutral axis position leading to the ultimate strength of ship. The objective of the present study is to analyze the ultimate strength caused by the double bottom height before and after modification. The double bottom height is analyzed according to the existing condition, national and international classification. Those formulas are different so that it is very important to know those effects. The numerical method is adopted to analyze the tankers ship caused by changing the double bottom height before and after modification. The force rotation is given at the master node since it is placed after determined the position of neutral axis as reference point. It is observed that the double bottom height gives significant influence to the ultimate strength according to existing condition, national and international classification before and after modification under hogging and sagging conditions. The ultimate strength in terms of the moment-curvature relationship including their behavior is presented in this study.
Response of One Degree of Freedom System to Harmonic Loading on the structure idealized as single degree of freedom systems excited harmonically, that is structure subjected to force or displacement where the magnitude may be represented by a sine or cosine function of time. This type of excitation results one of the most important motions in the study of mechanical vibrations as well as in applications to structural dynamics. Structure is very often subjected to the dynamic action such cyclic load acting and resulting response due to the the unavoidable load eccentricity. The objective of the present study is to analyze the response of one-degree of freedom system to the portal 2D. The structure is modelled and analyzed using finite element method. The result obtained by FE method is joint displacement of the structure.
The offshore structure, like the jacket, jack-up, gravity, and tower, can be categorized as a column structure subjected to vertical or horizontal load, i.e., the structure is identic with the frame structure. Those structures may be idealized as a frame structure with axial or lateral loads acting on the braces. The present study focuses on the analysis of the 2D frame structure subjected to point loads. The support conditions are fixed and hinged at the bottom joint. The point loads of 1 Ton are applied at the vertical and horizontal braces of the frame structure. All point loads are applied in the middle of the brace, either on a horizontal brace or vertical brace. The breadth and depth are 1 m and 1 m, respectively. The result obtained by the numerical method for three models is compared in terms of support reactions, joint displacement, and deformation.
The offshore structure like jacket, jack-up, gravity and tower can be categorized as a column structure subjected to vertical or horizontal load i.e. the structure is identic with the frame structure. Those structures may be idealized as a frame structure with axial or lateral loads acting on the braces. The present study focuses on the influence of support condition to response of the structure in terms of reactions, displacement and deformations. The support conditions are fixed and hinged at the bottom joint. The load distributions of 10 tonnes are applied at the horizontal brace at the top of the structure. The breadth and depth are 1 m and 1.5 m, respectively. The numerical method is performed to analyze the frame structure. The result obtained by numerical method for three models are compared in therms of support reactions, joint displacement and deformations.
Preliminary research on the risk assessment of coastal erosion in the Galesong District. The beach is an area between land and sea where various kinds of human activities are carried out in the coastal area. In the last few years, the abrasion disaster in the coastal area of Galesong District has continued to increase, so that the facilities and houses of the residents have been damaged. Disaster risk analysis is carried out to determine the value of disaster risk and develop strategies to reduce existing disaster risks. The data analyzed in the form of secondary data originating from the research literature at the location being studied as well as the database of agencies related to the population of the Galesong District. The risk value for coastal abrasion disaster in Galesong District was obtained, then a strategy was developed to reduce the risk value for coastal abrasion disaster in Galesong District.
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