A proposal of reliability-based design formats for ultimate hull girder strength checks for bulk carriers under combined global and local loadings

The purpose of this paper is to provide a basis for the development of reliability-based design formats for ultimate hull girder strength checks for bulk carriers in hogging conditions under combined global and local loading and to estimate implied safety levels in current rule practices for hull girders. The effect of alternative definitions of characteristic still-water loads on the safety format and, hence, the safety factors is assessed. The effect of systematic (bias) model uncertainties associated with loads and strength on the reliability measures is investigated.

[1]  Torgeir Moan,et al.  Ultimate strength analysis of a bulk carrier hull girder under alternate hold loading condition – A case study: Part 1: Nonlinear finite element modelling and ultimate hull girder capacity , 2008 .

[2]  O. Andersen,et al.  Freak Waves: Rare Realizations of a Typical Population Or Typical Realizations of a Rare Population? , 2000 .

[3]  Weicheng Cui,et al.  Comparative study of ultimate hull girder strength of large double hull tankers , 2005 .

[4]  Nigel Barltrop,et al.  A proposed method to evaluate hull girder ultimate strength , 2006 .

[5]  Julian Wolfram,et al.  Long and short-term extreme wave statistics in the North Sea: 1994-1998 , 1998 .

[6]  N Nordenstrom,et al.  SAFETY OF OFFSHORE STRUCTURES , 1985 .

[7]  T Moan,et al.  Critical assessment of ultimate hull girder capacity of ships from a reliability analysis point of view , 2006 .

[8]  Chen Ruizhan.  THE COMPARISON OF THE SHIP WAVE-INDUCED BENDING MOMENT BETWEEN IACS UR S11 AND LONG-TERM PREDICTION , 1996 .

[9]  Torgeir Moan,et al.  Analytical method of combining global longitudinal loads for ocean-going ships , 2008 .

[10]  Torgeir Moan,et al.  Model uncertainty in the long-term distribution of wave-induced bending moments for fatigue design of ship structures , 1991 .

[11]  Torgeir Moan,et al.  Effects of Avoidance of Heavy Weather on the Wave Induced Load on Ships , 2006 .

[12]  Torgeir Moan,et al.  Wave Pressure Distributions Along the Midship Transverse Section of a VLCC , 2008 .

[13]  Torgeir Moan,et al.  STATISTICAL ANALYSIS OF STILLWATER LOAD EFFECTS IN SHIP STRUCTURES , 1988 .

[14]  Odd M. Faltinsen,et al.  Sea loads on ships and offshore structures , 1990 .

[15]  Y. N. Chen,et al.  Implementation of reliability methods to marine structures , 1984 .

[16]  Torgeir Moan,et al.  Ultimate strength analysis of a bulk carrier hull girder under alternate hold loading condition, Part 2: Stress distribution in the double bottom and simplified approaches , 2009 .

[17]  C. Guedes Soares,et al.  Probabilistic modelling of time-varying still-water load effects in tankers , 2000 .

[18]  Alaa E. Mansour,et al.  Development of reliability based classification rules for tankers , 2003 .