The changes in mean and variance of midship section properties due to uniform corrosion wear

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The changes in mean and variance of midship section properties due to uniform corrosion wear

Chowdhury, Mahiuddin

A typical midship section is represented by a deck, inner bottom, outer bottom, side shells and round bilge corners. As an example, angle bar stiffeners were used throughout and symmetric I-beams are placed as girders. Accurate expressions were developed for the section properties of both stiffeners and then the midship section. The properties considered include cross-sectional area, moment of inertias and section modulus. The first order second moment (FOSM) approximation was used to derive the mean and standard deviation of the midship section properties. The changes in section properties due to uniform corrosion wear are considered. The main focus of this article is to derive accurate empirical relationships for the mean and standard deviation of any given midship section as simple functions of corrosion loss. It has been observed that all geometric properties are linear functions of total corrosion loss, and there is a single constant relevant to the section which specifies the property completely. This constant is termed as the configuration constant. However, the standard deviation is better approximated by a fourth order polynomial in total corrosion loss and hence requires four configuration constants.