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Lecture 8 – Ship Structures - Coggle Diagram
Lecture 8 – Ship Structures
Hierarchy levels
Primary level, s1
ship beam, longitudinal
strength
Secondary level, s2
double bottom structure
Tertiary level, s3
ship beam, longitudinal
strength
Primary Hierarchy Level – S1
Main (hull girder) elements forming
closed compartments
carry much of the hull girder bending
There are ship types that lack some of the main elements
Secondary Hierarchy Level – S2
Elements that may experience significant deformations
These elements transfer loads between primary (s1) and tertiary (s3) hierarchy level elements
The share of load carried by a specific type of element depends on the ship type
Tertiary Hierarchy Level – S3
Consist of local parts such as
Plating
Longitudinals
Transversals
Structural Framing systems
Longitudinal framing
Transverse framing
Mixed framing
Load transfer mechanisms
Pressure on plate supported by longitudinal(s) and web frames
Line loads on longitudinal(s) supported by web frames
Point loads on web frames supported by side structures
Structural design – work steps
Estimation of loads
Evaluation of the structural response
Strength assessment
The structural design process
• Preliminary weight estimates using empirical data
• Class regulations → basic dimensioning
• Determination of a steel GA
• Detailed weight estimates
• Identification of problem areas
• Class approval
• Determination of production drawings
• Consideration of feedback from
Shipbuilding materials
Composites
Aluminum
Steel
Classification of steel
Classification based on yield point
• normal steel (NS),
• high strenght steel (HS)
• extra high strenght steel (EHS)
Classification based on impact toughness
A-, B-, D, F- and E-grade