Introduction. Hydrostatic Loads. Equilibrium position for a floating structure. Hydrostatic coefficients. Sectional forces. Hydrostatic stability. Ocean Waves. Random variables. Stochastic processes. Random sea waves. Wave Loads on Ships. Froude-Krylov force. Linear hydrodynamic forces. Equations of motion. Linear wave responses in random seas. Slamming and green water on deck. Transient and non-linear hydrodynamics. Design loads. Hull Girder Response. Bending response. Shear response. Torsional response. Axial response. Temperature-induced response. Hull Girder Vibrations. Natural frequencies. Time-varying loads on the hull girder. Stiffness and mass distribution of the hull girder. Damping. Modal superposition. Reduction of the vibration level. Hull Girder Reliability. Material properties. Hull girder strength. Structural reliability
Load and Global Response of Ships gives an introductory background to naval architecture statistics and strength of materials. Each subject is treated in detail; starting from the first principle. The aim of this title was to derive and present the necessary theoretical framework for predicting the extreme loads and the corresponding hull girder stresses that a ship may be subjected to during its operational lifetime.
Although some account is given to reliability analysis, the present treatment has to be supplemented with methods for detailed stress evaluation and for structural strength assessment before a complete structural reliability analysis can be carried out.
The classification societies have issued rules and regulations for a proper structural analysis of a ship and selection of the scantlings. Previously, those rules rather explicitly gave formulae for the thickness of the hull plantings, the size of the stiffeners etc. Such empirical rules must necessarily be rather conservative in order to apply to a large variety of ships. With the advent of powerful computers, the rules have changed. Today, the naval architect can perform the structural analysis using mainly rational methods based on first principles. The classification society may then specify proper safety factors against local global failure modes, taking into account the consequences of failure and the analysis procedure used. A cruder method of analysis then necessitates a larger safety factor. Therefore the effort made by the experienced naval architect to perform a detailed structural analysis will be returned not just by a rational structural arrangement but also often in lower weight of the ship and thus a higher payload throughout the operational lifetime of the ship.
This analysis has attempted to make explicit one way in which designers limit the design space by creating rules to which they expect user
For ship scientists, naval architects, and ocean engineers who require a background knowledge of structural reliability analysis of ocean going vessels.
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- © Elsevier Science 2001
- 8th August 2001
- Elsevier Science
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Technical University of Denmark, Department of Naval and Offshore Engineering, DK-2800 KGS, Lyngby, Denmark