Enhanced Design Equations for the Residual Strength Index of Oil Tankers Subjected to Collision and Grounding

Abstract

In this study, we evaluate the residual longitudinal strength index of three double—hull oil tankers—Aframax, Suezmax, and very large crude carrier (VLCC)—based on collision and grounding scenarios by employing an improved progressive collapse method (PCM). We define the extent of damage based on the IACS-CSR. This study mainly contributes to the extraction of new quadratic equations, which are derived from 51 analytical simulations using curve-fitting. The objective is to establish the relationship between residual strength index (RSI) and damage size ratio (DSR). The proposed PCM incorporates the neutral axis (NA) rotation, overcoming a critical limitation in previous methodologies. Results indicate that not considering NA rotation can lead to a 26% overestimation of RSI. Furthermore, the results of grounding scenarios indicate a larger RSI reduction under hogging conditions than that under sagging conditions; this is attributed to the progressive deck failure and buckling of the inner bottom plating. A comparative analysis shows that inner hull damage significantly deteriorates the RSI reduction, emphasizing the need for refined structural integrity evaluations. Additionally, we analyze the factors affecting the longitudinal strength behavior of damaged ships. The newly extracted RSI—DSR equations and diagrams can be used in practice for rapid damage assessment and RSI estimation, contributing to improvements in ship structural safety and reliability.

Keywords

Ship collision and grounding / IACS-CSR / Progressive collapse method (PCM) / Residual strength index (RSI) / Oil tankers

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