OVERVIEW

The course is focused on the analysis of ship structures in terms of stresses generated by local and global actions and of scantlings

AIMS AND CONTENT

LEARNING OUTCOMES

The course aims at providing concepts and procedures for the identification of the main loads insisting on ship structures.

AIMS AND LEARNING OUTCOMES

Aim of the course is to explain criteria for the strength verification of ship structural elements and to provide the student with means for a quantification of loads with direct computations as well as with Class Societies formulations. Reference structural models are recalled and concepts and procedures are described for the identification of actions and and the quantification of loads and stresses acting on the structure in the main verification situations. Particular attention is devoted to the primary structure of the hull, to global loads and to the static response in linear field.

In addition, the global strength of the hull is covered also with non-linear computations of the ultimate limit state in bending and the dynamic response is treated in terms of bending vibrations of the hull girder and to the propagation of noise and vibrations on board.

PREREQUISITES

Fundamental knowledge corresponds to the content of base courses (Mathematics, Geometry, Physics and Chemistry). Without these contents, the present course cannot be effectively understood nor the exam passed. Further, the knowledge of the contents of the following courses is mandatory:

• Structural mechanics
• ship stability
• ship hull geometry

More specifically, fundamental knowledge correspons to the following items

• Geometric characteristics of plane and volumetric figures: inertia and static moments definitions and computational capabilities
• Structural characteristics of materials for shipbuilding: Young’s modulus, Poisson’s coefficient, shear modulus, stress-strain diagrams, yielding stress, allowable stress, ultimate stress.
• Base concepts of stress-strain state analysis for a beam subjected to external forces (in particular an Euler beam)
• Capacity of solving hyperstatic systems of beams by forces’ method.
• Capacity of interpreting the representation of typical ship structures (bottom, side, deck, bulkhead) following the course of Shipbuilding I
• Hull geometry characteristics: Hydrostatic tables, Bonjean tables and operational knowledge of their use.
• Ship statics elements (floating body equilibrium: metacentric method, Euler theorem and inherent validity ranges)

TEACHING METHODS

Lectures and guided computer exercises under supervision of the teachers for a total of 60 hours

SYLLABUS/CONTENT

• Primary, secondary and tertiary stresses
• Hull girder scheme 
• Still water loads
• Example of pontoon with distributed and concentrated load
• Wave induced loads
• Estimation of hull girder natural frequency
• Loads induced by launch and grounding
• Ultimate bending moment
• Noise and vibrations (dynamic response)

RECOMMENDED READING/BIBLIOGRAPHY

• Ship Design and Construction – Thomas Lamb editor SNAME The Society of Naval Architects and Marine Engineers 601 Pavonia Avenue Jersey City, NJ

TEACHERS AND EXAM BOARD

Exam Board

ENRICO RIZZUTO (President)

TATIANA PAIS

GIANMARCO VERGASSOLA

TOMASO GAGGERO (President Substitute)

LESSONS

LESSONS START

https://corsi.unige.it/8722/p/studenti-orario

EXAMS

EXAM DESCRIPTION

The exam is composed of two parts: written and oral

written/numerical exercise to be done in 15 minutes: simple numerical exercise. Electronic aids are not suggested.                At the end, the student shall be able to quickly report results verbally

Theoretical oral exam 2-3 questions on any topic covered in the course and/or on the reports of the exercises carried out during the lectures (abt 30 min in total)

ASSESSMENT METHODS

The written part will allow to check the capacity of executing simple computations on the load distributions

The oral part is devoted to checking the knowledge of base concepts regarding the definition of global and local loads acting on ship structures and of their scantlings.

Parameter for the evaluation of the candidate are: quality of the presentation, correct use of the specific wording, capacity of logical presentation of concepts and of critical reasoning.

Exam schedule