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Collapse Analysis of Container Ship Model Under Combined Bending And Torsion Applying Idealized Structural Unit Method
Pei, Zhiyong (Tsuneishi Shipbuilding Co., LTD) | Gao, Chu (Tsuneishi Shipbuilding Co., LTD) | Yao, Tetsuya (Tsuneishi Shipbuilding Co., LTD) | Tanaka, Yoshiteru (National Maritime Research Institute) | Tanaka, Satoyuki (Hiroshima University) | Okazawa, Shigenobu (Hiroshima University) | Iijima, Kazuhiro (Osaka University) | Fujikubo, Masahiko (Osaka University)
ABSTRACT: Clear understanding of the collapse behaviour of container ship having large hatch openings under pure bending and pure torsion as well as combined bending and torsion is very important to ensure the safety of container ships which are now widely used all over the world. In the present paper, a series of progressive collapse analyses is performed on 1/13-scale container ship models under pure bending, pure torsion and combined bending and torsion applying Idealized Structural Unit Method (ISUM) developed by the authors. The calculated loaddisplacement relationships are compared with the experimental results as well as calculated results applying nonlinear FEM. Similar collapse behaviour was observed between calculated and measured results. Thus, applicability of the developed ISUM element and the accuracy of the calculated results are demonstrated. INTRODUCTION Container ship has become a popular ship type all over the world due to its large cargo capacity, excellent suitability for carriage of sustaining supplies and ammunition as well as rapid and efficient cargo operations. The hull girder of container ship shall be subjected to combined bending and torsion and may be in severe condition against torsion because of its large hatch openings. It is necessary to clearly understand its load-carrying capacity under pure bending, pure torsion and combined bending and torsion to ensure its safety under bad weather condition or other severe conditions. The research on collapse behaviour under pure torsion or combined bending and torsion was limited (for example Hu and Chen, 2001) and clear understanding had not yet been obtained. Of course, such behaviours could be obtained by performing NFEM analysis considering both buckling and yielding. However, such analysis is too much time consuming and is not easily performed. ISUM, a simple but efficient method, can also be applied for such analysis.
- Transportation > Marine (1.00)
- Transportation > Freight & Logistics Services > Shipping > Container Ship (1.00)
Collapse Analysis of Double Bottom Structures Considering Shear, Lateral Pressure And Welding Residual Stress
Gao, Chu (Tsuneishi Shipbuilding Co., LTD) | Pei, Zhiyong (Tsuneishi Shipbuilding Co., LTD) | Yao, Tetsuya (Tsuneishi Shipbuilding Co., LTD) | Yasuoka, Aya (Hiroshima University) | Tanaka, Satoyuki (Hiroshima University) | Alie, Zubair Mmuis (Osaka University) | Iijima, Kazuhiro (Osaka University) | Fujikubo, Masahiko (Osaka University)
ABSTRACT: Idealized Structural Unit Method (ISUM) is a simplified but efficient method in which geometrical nonlinearity and material nonlinearity are idealized and included in the element so that larger structural unit can be regarded as one ISUM element. ISUM element subjected to bi-axial thrust, bending, shear and lateral pressure and with welding residual stress had been developed by some of the authors. In the present paper, collapse analysis of double bottom structures of a Kamsarmax type bulk carrier had been performed using ISUM. The effects of shear in web of floors and girders, lateral pressure on plating as well as welding residual stress on collapse behaviour and strength are discussed. To validate results of ISUM analyses, collapse analyses using nonlinear FEM software, MSC.Marc, are also performed. Through comparison of calculated results, the applicability and accuracy of the present ISUM element are demonstrated. INTRODUCTION Evaluation of the ultimate strength of ship hull girder is the most fundamental and important aspect to ensure the safety of ships. After the Common Structural Rules (CSR) came into effect, ultimate hull girder strength under longitudinal bending has become to be evaluated. When a ship is in alternate heavy loaded condition with heavy cargos, double bottom structures are subjected to severe loading condition, which is combined compression due to overall bending and local bending due to alternately loaded heavy cargos. So, many researchers devote themselves on evaluation of ultimate strength of double bottom structures recently. Of course, nonlinear FEM can be applied to evaluate the ultimate strength of double bottom structures. However, too much man-powers, time and efforts are necessary to obtain rational results, and highly efficient, accurate but simple methods are required. Idealized Structural Unit Method (ISUM), which was firstly proposed by Ueda and Rashed (1974) is one of such methods.
- Transportation > Marine (0.55)
- Shipbuilding (0.48)