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Strength Analyses for Ultra Large Containerships
4/14/2005
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Strength Analyses for Ultra Large Containerships
According to Chris Wiernicki, Chief Technology Officer at ABS, they have found that the traditional prescriptive approach has not adequately addressed some load effects. The unique hull form of these vessels with large, flat, overhanging sterns and pronounced bow flare, coupled with high service speeds, introduces non-linear ship motions and load effects that will impact the magnitude of the wave induced bending moment, the torsional loads, as well as whipping, bow and stern slamming and springing. Using the sophisticated ABS SafeHull Dynamic Load Approach (ABS SH-DLA), coupled with the Large Amplitude Motion Program (LAMP), the society has been able to review a number of existing and proposed shipyard designs and has clearly identified the high stress areas that may be susceptible to cracking within a relatively short in-service period. That is why loads that have been considered implicitly in traditional class rules must now be treated explicitly, using engineering first principles, if adequate strength is to be introduced at the design stage. |
Greater attention must be paid to the allocation of steel within the structure, to the design details and the overall structural arrangement. The overall steel weight of the vessel should not be affected but the distribution of the steel within the structure should properly address the specific stress concentrations that can be determined through a non-linear hydrodynamic sea loads analysis. Appropriate criteria are being incorporated into the ABS Rules. |
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About the Company
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