Post-accidental structural reliability of double-hull oil tanker with near realistic collision damage shapes

2020 ◽  
Vol 15 (sup1) ◽  
pp. S190-S207
Author(s):  
Joško Parunov ◽  
Pero Prebeg ◽  
Smiljko Rudan
Keyword(s):  
Structural Reliability ◽  
Double Hull ◽  
Oil Tanker

Structural Reliability of Oil Tanker in the Adriatic Sea Damaged in Collision and Exposed to Combined Bending Moments

2018 ◽  
Author(s):  
Maro Ćorak ◽  
Joško Parunov
Keyword(s):  
Structural Reliability ◽  
Adriatic Sea ◽  
Bending Moment ◽  
State Function ◽  
Regression Equations ◽  
Bending Moments ◽  
Damage Stability ◽  
Safety Indices ◽  
Oil Tanker ◽  
Damaged Ship

The aim of the paper is the assessment of structural reliability of oil tanker which may be damaged in collision accident in the Adriatic Sea and exposed to combined, horizontal and vertical bending moments. Damage size is assumed based on the direct numerical simulation of the ship-ship collision. This is justified for some specific sea environments, as the Adriatic Sea, where ship sailing routes and representative ship types involved in accidents are known, so possible collision scenarios may be reasonably predicted. Residual bending moment capacity under combined bending moment is calculated using regression equations developed based on non-linear finite element analysis. Still water vertical bending moments are obtained by damage stability analysis. Vertical and horizontal wave bending moments are determined by short-term response analysis of damaged ship in the Adriatic Sea, using transfer functions obtained by 3D panel hydrodynamic method. Limit state function is defined using interaction equation for damaged ship exposed to combined bending moments. Safety indices are calculated by FORM for different collision scenarios that are generated by MC simulations. Such approach enables to determine the safety indices for the most frequent damages and also to reveal the most critical situations resulting in the lowest safety indices.

Numerical estimation of ultimate strength on double hull oil tanker cargo area

2021 ◽  
pp. 121-126
Author(s):  
M.Z. Muis Alie ◽  
M. Fathurahkman ◽  
Juswan ◽  
F.A. Prasetyo
Keyword(s):  
Ultimate Strength ◽  
Numerical Estimation ◽  
Double Hull ◽  
Oil Tanker

Structural Reliability of Oil Tanker in the Adriatic Sea Damaged in Collision and Exposed to Combined Bending Moments

2019 ◽  
Vol 142 (3) ◽  
Author(s):  
Maro Ćorak ◽  
Joško Parunov
Keyword(s):  
Monte Carlo ◽  
Structural Reliability ◽  
Adriatic Sea ◽  
Regression Equations ◽  
Bending Moments ◽  
Load Combination ◽  
Horizontal Wave ◽  
Safety Indices ◽  
Oil Tanker ◽  
Damaged Ship

Abstract The aim of the paper is the assessment of structural reliability of oil tanker, damaged in collision accident in the Adriatic Sea and exposed to combined, horizontal, and vertical bending moments. Damage size is assumed based on the direct numerical simulation of the ship–ship collision. This is justified for some specific sea environments, as the Adriatic Sea, where ship sailing routes and representative ship types involved in accidents are known, so possible collision scenarios may be reasonably predicted. Residual bending moment capacity under combined bending moments (CBM) is calculated using regression equations developed based on non-linear finite element analysis. Still-water vertical bending moments are obtained by damage stability analysis for different collision scenarios that are generated by Monte Carlo (MC) simulations. Vertical and horizontal wave bending moments are determined by short-term response analysis of damaged ship in the Adriatic Sea, using transfer functions obtained by 3D panel hydrodynamic method. Monte Carlo time simulations are performed in order to study probabilistic load combination (LC) considering randomness of the wave process due to different phase angles. Limit state function is defined using interaction equation for damaged ship exposed to combined bending moments. Safety indices are calculated by FORM for each damage scenario by using Turkstra's rule for load combination of vertical and horizontal wave bending moments. Such an approach enables to determine the safety indices for the most frequent damages and also to reveal the most critical situations resulting in the lowest safety indices.

scholarly journals Study on ultimate strength of ship’s hull considering cross section and beam finite element.

2018 ◽  
Vol 177 ◽  
pp. 01030
Author(s):  
Muhammad Zubair Muis Alie ◽  
Juswan ◽  
Wahyuddin ◽  
Taufiqur Rachman
Keyword(s):  
Finite Element ◽  
Ultimate Strength ◽  
Cross Section ◽  
Bending Moment ◽  
Bulk Carrier ◽  
Longitudinal Bending ◽  
The Cross ◽  
The One ◽  
Double Hull ◽  
Oil Tanker

The objective of the present research is to study the ultimate strength of ship’s hull considering cross section and beam finite element under longitudinal bending. The single hull bulk carrier and double hull oil tanker are taken to be analysed. The one-frame space of ship is considered in the calculation. The cross section of ship’s hull is divided into element composed plate and stiffened plate. The cross section is assumed to be remained plane and the simply supported is imposed to both side of the cross section. The longitudinal bending moment is applied to the cross section for hogging and sagging condition. The Smith’s method is adopted and implemented into the in-house program of the cross section and beam finite element to calculate the ultimate strength of ship’s hull. The result of the ultimate strength for hogging and sagging condition obtained by considering the cross section and beam finite element is compared with one another.

Rapid Assessment of Hull Girder Collapse for Corroded Double Hull Oil Tanker After Collision

2016 ◽  
Author(s):  
Sung Hwan Noh ◽  
Jung Kwan Seo ◽  
Jeom Kee Paik ◽  
Samy A. M. Youssef
Keyword(s):  
Finite Element ◽  
Structural Damage ◽  
Rapid Assessment ◽  
Probabilistic Approach ◽  
Hull Girder ◽  
The Alps ◽  
Oil Tankers ◽  
Double Hull ◽  
Oil Tanker ◽  
Probability Density Function Pdf

Corroded tankers might be subjected to a very serious structural damage if involved in collision accidents. For understanding or preventing the collision accidents, various studies are being proposed by researchers to improve the analysis method. In this paper, four types of double hull oil tankers (Panamax, Aframax, Suezmax and VLCC) are used. Probabilistic approach is used to create ship-ship collision scenarios for each target structure and the ultimate longitudinal hull girder strength of the hypothetical oil tanker’s hull cross-section. The ALPS/HULL is used to simulate and is intelligent supersize finite element method (ISFEM) software. A relevant probability density function (PDF) is introduced using the results from finite element simulations of the ship-ship collisions, which is commonly used to predict residual strength.

Residual ultimate strength assessment of double hull oil tanker after collision

2017 ◽  
Vol 148 ◽  
pp. 704-717 ◽  
Author(s):  
Joško Parunov ◽  
Smiljko Rudan ◽  
Branka Bužančić Primorac
Keyword(s):  
Ultimate Strength ◽  
Strength Assessment ◽  
Double Hull ◽  
Oil Tanker

scholarly journals Study on Striking Ship with Loading Impact on the Performance of the Double Hull Oil Tanker Collision

2018 ◽  
Vol 25 (s2) ◽  
pp. 42-48
Author(s):  
Wenfeng Wu ◽  
Yubin Yang ◽  
Jianwei Zhang ◽  
Jinshu Lu
Keyword(s):  
Loading Condition ◽  
Damage Mechanism ◽  
Impact Performance ◽  
Finite Element Software ◽  
Force Impact ◽  
Collision Force ◽  
Oil Tankers ◽  
Double Hull ◽  
The Impact ◽  
Oil Tanker

Abstract Due to the great danger of the collision of oil tankers, lots of research on the collision of oil tankers has been carried out. But, at present, the research on the collision of oil tankers mainly focuses on the loading condition of the struck ship, ignores the impact on the loading condition of the striking ship. However, during the actual oil tanker collision, the striking ship is generally in the state of loading. Therefore, it is necessary to carry out the analysis of the impact of the loading condition of the striking ship on the collision damage of the oil tanker. In this paper, the effect of striking ship with loading on the impact performance of the side structure during the collision of the cargo double hull oil tanker has been investigated. The ship collision model was established by using the finite element software ANSYS/LS-DYNA which is based on 7000 tons of double hull oil tankers. Based on the analysis of the collision force, impact of striking speed changes, impact of striking deep changes and structural energy absorption during the collision process, the influence of the striking ship with loading on the damage mechanism and the impact performance of the double shell oil ship side structure was expounded. The results show that the influence of the striking ship with loading can be great to the damage to side hull during the research of the collision performance of the oil tanker.

scholarly journals Comparison the Stiffened Plate Deflection of T and RSF Stiffeners on Marine Structure Subjected Force and Pressure

2020 ◽  
Vol 2 (3) ◽  
pp. Manuscript
Author(s):  
Ratthakrit Reabroy
Keyword(s):  
Equivalent Stress ◽  
Vertical Direction ◽  
Model Design ◽  
Stiffened Plate ◽  
Element Analysis ◽  
Marine Structure ◽  
Maximum Equivalent Stress ◽  
New Type ◽  
Double Hull ◽  
Oil Tanker

This work aims to compare deflection in the vertical direction between the perfect T- and RSF-stiffeners, which subjected by forces and pressures. The geometry of stiffener models have studied the conventional T-stiffeners model design as the actual double hull oil tanker and the RSF-stiffeners are new type design based on T-stiffener specifications. The deflection theories of simply supported beam were studied by double integral method and moment area method. Finite Element Analysis (FEA) is used to design and simulation the deflection in vertical direction and maximum equivalent stress of stiffeners after subjected force and pressure within the same boundary condition. All stiffener models are obtained and result from FEA are shown in linear and nonlinear curves. The verification between theoretical and FEA results are in agreement. The load-deflection curves are shown that the performance of all RSF-stiffeners are greater than the conventional T-stiffener. 

Ship Collision Analysis of Double Hull Structures in Various Ship Types

2021 ◽  
Author(s):  
Jie Chen ◽  
Bin Liu ◽  
R. Villavicencio ◽  
Jian Ji ◽  
C. Guedes Soares
Keyword(s):  
Structural Characteristics ◽  
Container Ship ◽  
Conventional Analysis ◽  
Ship Collision ◽  
Structural Configurations ◽  
Double Hull ◽  
Impact Characteristics ◽  
The Impact ◽  
Force Displacement ◽  
Oil Tanker

Abstract This paper elaborates the impact characteristics of double hull structures in various ship types including bulk carrier, container ship, LNG carrier and oil tanker. Their own structural configurations, such as the strengthened topside tank in the container ship, affect the crashworthiness of double hull structures in ship collisions. Two striking bows are modeled so as to evaluate the crashworthiness of the double hull structures. The calculations are performed using LS-DYNA to assess the impact characteristics of four struck ships. The ship collision analysis also discusses the assumption of rigid bow in conventional analysis and its effect on the evaluation of side structural crashworthiness. The numerical force-displacement responses and absorbed energy-displacement curves of various ships are compared. The comparison aims to reveal the discrepancy of the crashworthiness of the four typical double hull structures. It is of importance to analyze their structural characteristics for the design of crashworthy structures.

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