ssc-367 - Ship Structure Committee

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Optimize the design details to minimize SCFS
Another parameter that is not important to the actual fatigue life
but very important to the computed fatigue life is the analysis
method and the assumptionsused in the analysis. Although there is
no substitute for experience, comparative studies carried out by
others should be utilized and the analysis method selected and the
assumptionsmade should be applicableto the marine structure being
designed.
4.5
FATIGUE DESIGN AND ANALYSIS CRITERIA
Fatigue design and analysis criteria are generally covered in one
chapter of the structural design basis document. Fatigue criteria
may also be jointly prepared by the engineer and the owner as a
separate design brief to document the fatigue design and analysis
basis.
4.5.1 Basis for the Preparation of Criteria
The design and analysis criteria serve the purpose of clearly
defining the work to be undertaken. Three primary variables that
affect the fatigue design and analysis criteria are:
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The owner’s requirements for work scope
and schedule
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The engineer’s assessment of the
sensitivity to fatigue and the required
marine structure’s
level of analysis
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The role of classification societies
The owner, engineer and classification society all agree that the
design and analysis should lead to quality fabrication and ensure
the structural and operational integrity of the marine structure
throughout its design life. To accomplish these goals, a design
should provide a balance between efficiency and redundancy and also
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