Uncertainties of load characteristics and fatigue damage of ship structures

Alternative environmental contours for structural reliability analysis

“…Let B be defined as in (4) and let QðP e Þ be defined as in (5). Then the following two statements are equivalent:…”

Determination of environmental load factors for ISO 19902 code in offshore Malaysia using FORM structural reliability method

“…They represent the maximum load intensity to capture the tail characteristics of these distributions. Many researchers have selected Weibull distribution for environmental load uncertainty (Sorensen and Sterndorff, 2001;Petrauskas and Aagaard, 1971;Bitner-Gregersen and Cramer, 1995). Primary environmental load uncertainty parameter for fixed Jackets include wave, wind and current among these wave is the dominating load (Holland, 1977;Tromans and Forristall, 1998).…”

An Illustration of the Effect of Climate Change on the Ocean Wave Climate - A Stochastic Model

“…As an illustrative example, load characteristics will be calculated for an oil tanker of 250 m length and 40 m width with the same characteristics as the one reported in [5]. When specifying design criteria as well as carrying out load and response assessment for marine structures a full long-term load and response analysis can be applied, or alternatively, the environmental contour concept outlined in [48] can be used (IFORM).…”

“…The 25-year stress amplitudes for the considered oil tanker have been calculated in the 25-year sea states (H s , T z ) given by the environmental contour lines. A 3-hour sea state duration and a Rayleigh distributed stress process in a short-term sea state (see [5]) have been assumed in the calculations. Table 4 includes the results of the analysis for the original joint (H s , T z ) fit and the modified ones, taking the estimated 100-year long-term trends into account.…”