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The longitudinal strength analysis considering the influence of double bottom height on Double Hull oil tanker
Alie M.Z.M.
Aip Conference Proceedings
Abstract
The study focuses on assessing the longitudinal strength of ships, with particular attention to construction elements, including the deck, cargo hold, and especially the double bottom. The double bottom, an integral part of the ship’s structure, is crucial for enhancing the bottom construction’s strength and is designed in compliance with standards set by National Classification and/or the International Association of Classification Societies (IACS). A key design aspect of the double bottom is its height, which significantly impacts the ship’s longitudinal strength by influencing the cross-section’s modulus and inertia, as well as the position of the neutral axis. Thus, it’s essential to thoroughly analyze and evaluate how the double bottom height affects the ship’s longitudinal strength. The main aim of this study is to investigate how variations in the double bottom height influence the longitudinal strength of Double Hull Tankers, specifically in terms of deformation and the strength under conditions of hogging and sagging at the deck and bottom, adhering to National Classification and IACS standards. The method used for this comparative analysis is numerical, focusing on the midship section of a Double Hull Tanker. The study examines different double bottom heights, including existing conditions and those specified by National Classification and IACS regulations. The findings reveal that the longitudinal strength determined by IACS rules is less than that calculated under National Classification guidelines, largely due to the varying effects of double bottom height. This discrepancy also affects the section modulus, inertia, and position of the neutral axis. Additionally, the study explores how the ship’s longitudinal strength varies under hogging and sagging conditions, including the associated deformations.