Practical estimation methods of the design loads for primary structural members of tankers

Shigemi, Toshiyuki; Zhu, Tingyao

doi:10.1016/s0951-8339(03)00022-4

Cited by 8 publications

(1 citation statement)

References 13 publications

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“…The load combination factors are basically calculated from transfer functions and phase angles between the dominant and secondary load responses for each load case. This regular wave approach has been widely used in local scantling and finite element analysis of ship structures [3] [9]. In fatigue analysis of ship structures, however, the long-term stresses rather than instantaneous ones are of main interest.…”

Section: Introductionmentioning

confidence: 99%

Load Combination for Fatigue Analysis of Ship Structures

Shin

Kim

Fyfe³

2004

23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 2

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A methodology for calculating the correlation factors to combine the long-term dynamic stress components of ship structure from various loads in seas is presented. The methodology is based on a theory of a stationary ergodic narrow-banded Gaussian process. The total combined stress in short-tem sea states is expressed by linear summation of the component stresses with the corresponding combination factors. This expression is proven to be mathematically exact when applied to a single random sea. The long-term total stress is similarly expressed by linear summation of component stresses with appropriate combination factors. The stress components considered here are due to wave-induced vertical bending moment, wave-induced horizontal bending moment, external wave pressure and internal tank pressure. For application, the stress combination factors are calculated for longitudinal stiffeners in cargo and ballast tanks of a crude oil tanker at midship section. It is found that the combination factors strongly depend on wave heading and period in the short-term sea states. It is also found that the combination factors are not sensitive to the selected probability of exceedance level of the stress in the long-term sense.

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Section: Introductionmentioning

confidence: 99%