Ultimate hull girder strength of a bulk carrier under combined global and local loads in the hogging and alternate hold loading condition using nonlinear finite element analysis |
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Authors: | Zhi Shu Torgeir Moan |
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Institution: | (1) Department of Marine Technology, Centre for Ships and Ocean Structures, Norwegian University of Science and Technology, 7491 Trondheim, Norway |
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Abstract: | For bulk carriers in hogging, the most critical situation is the alternate hold loading (AHL) condition with odd numbered
holds loaded with high density cargoes and even numbered holds empty. The effect of the local lateral pressure loads should
be considered in the assessment of ultimate hull girder strength in the hogging and AHL conditions. In the present paper the
ultimate strength of a Capesize bulk carrier hull girder under combined global and local loads in the hogging and AHL condition
is extensively and systematically investigated using nonlinear finite element (FE) analysis with ABAQUS software. Since the
bulk carrier used as a reference vessel in this study is an old design we also studied the effect of modified scantlings by
multiplying the plate thickness in the bottom structure by a design modification factor (DMF). In particular, it should be
noted that a DMF of 1.4 gives a design in accordance with the new CSR rules. Based on the results obtained by nonlinear FE
analyses, a practical interaction equation is established between global hogging bending capacity and average external sea
pressure over the bottom. |
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Keywords: | |
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