On long-term prediction of stresses in principal members of ship hull structures. Current report

• Autorzy: Bogdaniuk M.
• Języki publikacji: EN

Abstrakty

EN

The paper presents a discussion on the strength criteria and load cases required in the rules of classification societies for direct FEM strength analysis of ship hull structures, which show some differences to each other. The conclusion of it is that detail studies on stress values in ship structures are necessary to improve the requirements. With this end in view an effective method for long-term prediction of stresses in ship hull structure princiŹpal members is proposed. The method is based on the concept of influence coefficients and spectral analysis of wave loads. A FEM model of the principal member system in the form of 3D frame is applied to calculate values of the influence coefficients. Next, the concept is used of correlaŹtion factors for combining characteristic long-term stress values caused by global and local loads, with combined stresses due to general bending of the ship, zone bending of the principal members and local bending of longitudinals. As an example, results of stress prediction and correlation factors calculated in some points of hull structure of a panamax bulk carrier are presented and discussed.

Słowa kluczowe

EN

Rules for classification of ships; spactral analysis of wave loads on ships; dynamic stresses in ship hull structures

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2004
• Tom: nr 3
• Strony: 3--6
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Bogdaniuk M.

• Polish Register of Shipping, Al. Ge. Józefa Hallera 126, 80-416 Gdańsk, Poland

Bibliografia

• 1. American Bureau of Shipping : Rules for building and classing Steel Vessels. 2001, Part 5 - Specific Vessel Types
• 2. Det Norske Veritas : Rules for Classification of Ships, Part 3, January 2001
• 3. Det Norske Veritas : Strength Analysis of Hull Structures in Bulk Carriers. Rules for Classification. Notes No. 31.1, June 1999
• 4. Polski Rejestr Statków : Rules for the classification and construction of sea-going ships, Part ll-Hull (in Polish). 2002
• 5. Polski Rejestr Statków : Zone strength analysis ofbulk carrier hull strucutre, (in Polish). Publication No. 18/P, 1995
• 6. Registro Italiano Navale : Rules for the Classification of Ships, Part B - Hull and Stability, June 2000
• 7. International Association of Classification Societies : Longitudinal Strength Standard, Rev. 3, June 2003
• 8. Jankowski J. : Ship Motions and Loads - formulation of Rules. Publication No. 2 - Classification. Polski Rejestr Statków. Gdańsk, 1993
• 9. Bogdaniuk M., Jankowski J. : An Approach to Fatigue Strength Assessment of Longitudinal Ship Hull Members. Marine Technology Transactions, Vol. 7, Gdańsk, 1996
• 10. Ochi M. K.: Ocean Waves - the Stochastic Approach. Cambridge University Press. 1998
• 11. Faltinsen O. M.: Sea Loads on Ships and Offshore Structures. Cambridge University Press. 1990