Since the recent obligation for tankers to adopt a double-hull structure, most types of ships have adopted a double-hull structure. In doublehull structure, the neutral axis lies near the center of the cross section, so that the high tensile and compressive stress of about the same level occur alternately on the skin plate. Considering the transverse strength of hull under the heavy load condition, a compressive stress nearly equal to the allowable stress acts on the skin panels which, in many cases, exceeds the elastic buckling stress of such panels. Once skin panels as attached plate of girder are buckled, the stiffness of the girders decreases consequently. If this stiffness reduction leads the expansion of the region of panel buckling, global strength of hull decreases seriously. On the other hand, such panel elastic buckling dose not have serious effect on the global strength of hull if the buckled region is limited in the small area due to the re-distribution of the applied load. Therefore the assessment of the safety and reliability of double hull structure under the heavy load condition requires the confirmation of the buckling strength of the skin plate panels and the behavior of the global structure after buckling. Recent progress of the analysis tool and expanded capacity of the computer system enables to solve such complicated nonlinear problems gradually. However these analyses have not been effectively applied in the actual design stage yet because the global hull structure model is too large for this kind of nonlinear analysis. In order to accurately evaluate the post buckling behavior of whole double hull structure in a practical time, the authors have developed the new assessment system, named SAIAS-PB, by the iteration of linear FEM analysis introducing simplified plate element with equivalent stiffness of buckled panel.
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The Twelfth International Offshore and Polar Engineering Conference
May 26–31, 2002
Kitakyushu, Japan
Practical Evaluation System For Post-Buckling Strength of Ship Double-Hull Structures
Akinori Abe;
Akinori Abe
Ishikawajima-Harima Heavy Industries Co., Ltd Ship and Offshore Engineering Dept
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Yoshihiro Niihara;
Yoshihiro Niihara
Ishikawajima-Harima Heavy Industries Co., Ltd Ship and Offshore Engineering Dept
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Tadashi Shibue;
Tadashi Shibue
Ishikawajima-Harima Heavy Industries Co., Ltd Research Laboratory, Structure and Strength Dept
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Eiji Nakayama;
Eiji Nakayama
Ishikawajima-Harima Inspection & Instrumentation Co., Ltd Technical Solution Dept
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Tomoki Nagashima
Tomoki Nagashima
IEM Co., Ltd Engineering Dept
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Paper presented at the The Twelfth International Offshore and Polar Engineering Conference, Kitakyushu, Japan, May 2002.
Paper Number:
ISOPE-I-02-486
Published:
May 26 2002
Citation
Abe, Akinori, Niihara, Yoshihiro, Shibue, Tadashi, Nakayama, Eiji, and Tomoki Nagashima. "Practical Evaluation System For Post-Buckling Strength of Ship Double-Hull Structures." Paper presented at the The Twelfth International Offshore and Polar Engineering Conference, Kitakyushu, Japan, May 2002.
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