Article In: cienciavitae

Análise Estatística de Momentos Flectores e Esforços Transversos em Águas Paradas de Petroleiros, Mineraleiros e Graneleiros

Statistical analysis of still-water bending moments and shear forces in tankers, ore and bulk carriers

Ingenieria Naval

Guedes Soares, Carlos; Moan, Torgier — 1983

Key information

Authors:

Guedes Soares, Carlos (Carlos Guedes Soares); Moan, Torgier

Published in

January 1983

Abstract

Apresentam-se os resultados estasticos de solicitações correspondentes a cerca de 100 anos/navio de operação de pertoleiros, mineraleiros e graneleiros. A analise mostrou a existencia de diferenças significativas nos valores médios das solicitações dos varios tipos de navios o que nao esta ainda considerado nas Regras das Sociedades de Classificação. Verificou-se ainda que estes valores dependem também das dimensões dos navios e das condiçoes de carga. Os testes de ajustamento indicaram que a distribuição normal era adequad para a descrição das solicitações na maior parte das situações. Tambem se considerou o tempo de viagem e o tempo em porte e concluiu-se que podiam ser representados por uma distribuição normal e exponencial respectivamente. Compararam-se extrapolações destes dados com os valores de projecto definidos pelas Sociedades de Classificação e demonstra-se como se podem utilizar métodos probabilisticos para calibrar regulamentos de dimensionamento estrutural. Although the still-water loading of ships contributes significantly to the total load, little attention has been directed towards its systemtic treatment. In this paper a statistical study of the still-water bending moments and shear forces recorded in the operation of some ships has been performed. The data base consists of about 100 years of accumulated operation of 18 ship of three types. The analisys demonstrated significant differences in mean load levels between the ship types. However, the existing Rules do not specify different minimum still-water loads according to the type of the ship. Other conclusions were that the mean load levels, as a percentage of the Rule values, varied with ship size. In addition, the loads did not show a consistent variation with deadweight, increasing in some situations and decreasing in others. Test of fit were applied to the sample of loads, deadweight, trim, voyage duration and time in port. Extreme values obtained from this data were compared with the design values prescribed by Classification Societies and it was demonstrated how probabilistic methods can be used to calibrate structural design codes.

Publication details

Authors in the community:

Publication version

VoR - Version of Record

Title of the publication container

Ingenieria Naval

First page or article number

75

Last page

89

Volume

51

Fields of Science and Technology (FOS)

other-engineering-and-technologies - Other engineering and technologies

Publication language (ISO code)

por - Portuguese

Rights type:

Restricted access