Progressive collapse analysis of a bulk carrier hull girder under longitudinal vertical bending moment considering cracking damage

2021 ◽  
Vol 242 ◽  
pp. 110140
Author(s):  
Ashkan Babazadeh ◽  
Mohammad Reza Khedmati
Keyword(s):  
Progressive Collapse ◽  
Bending Moment ◽  
Bulk Carrier ◽  
Hull Girder ◽  
Collapse Analysis ◽  
Progressive Collapse Analysis ◽  
Vertical Bending Moment

Collapse Analysis on VLCC Subjected to Longitudinal Bending with Damages

2018 ◽  
Vol 874 ◽  
pp. 121-127
Author(s):  
Muhammad Zubair Muis Alie ◽  
Wahyuddin ◽  
Syamsul Asri ◽  
Farianto Fachruddin Lage ◽  
Juswan ◽  
...  
Keyword(s):  
Cross Section ◽  
Progressive Collapse ◽  
Initial Imperfection ◽  
Bending Moment ◽  
Hull Girder ◽  
Simply Supported ◽  
Collapse Analysis ◽  
Longitudinal Bending ◽  
The Cross ◽  
Vertical Bending Moment

The objective of the present study is to analyze the progressive collapse of VLCC hull girder with damages subjected to longitudinal bending. For the simple case, the cross-section is assumed to be remained plane and the vertical bending moment is applied to the cross section. The residual stress, initial imperfection, and crack are not considered. The damages scenarios are located at the center part and asymmetric position of the cross section. To analyze the progressive collapse including its behavior of VLCC ship hull, the simply supported is imposed to the cross section and taking the hogging and sagging condition into account. The results obtained for intact and damages condition by the analytical solution is compared and summarized with one another.

Experimental Evaluation of the Ultimate Bending Moment of a Slender Thin-Walled Box Girder

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
José Manuel Gordo ◽  
C. Guedes Soares
Keyword(s):  
Residual Stresses ◽  
Progressive Collapse ◽  
Bending Moment ◽  
Bending Test ◽  
Postbuckling Behavior ◽  
Box Girder ◽  
Collapse Mode ◽  
Collapse Analysis ◽  
The Moment ◽  
Progressive Collapse Analysis

The results of a four points bending test on a box girder are presented. The experiment is part of series of tests with similar configuration but with different thickness and span between frames. The present work refers to the slenderest plate box girder with a plate's thickness of 2 mm but with a short span between frames. The experiment includes initial loading cycles allowing for partial relief of residual stresses. The moment curvature relationship is established for a large range of curvature. The ultimate bending moment (UM) of the box is evaluated and compared with the first yield moment and the plastic moment allowing the evaluation of the efficiency of the structure. The postbuckling behavior and collapse mode are characterized. Comparison of the experiment with a progressive collapse analysis method is made taking into consideration the effect of residual stresses on envelop of the moment curvature curve of the structure.

Evaluation of Ultimate Hull Girder Strength in Longitudinal Bending: Historical Review and Smith’s Method

2016 ◽  
Author(s):  
Tetsuya Yao
Keyword(s):  
Progressive Collapse ◽  
Historical Review ◽  
General Situation ◽  
Average Strain ◽  
Simple Method ◽  
Hull Girder ◽  
Research Activities ◽  
Collapse Analysis ◽  
Longitudinal Bending ◽  
Progressive Collapse Analysis

Ultimate hull girder strength in longitudinal bending is the most important strength of ship structure. In the present paper, firstly, historical review is made regarding the research activities regarding the ultimate hull girder strength evaluation. Then, focusing on the Smith’s method, possibility of simplified method is discussed including what are the limitations of a simple method and how it can be extended to more general situation. A simple method is introduced to derive average stress-average strain relationships of stiffener elements with attached plating. At the end, results of some example calculation are introduced to demonstrate the effectiveness of a simple method for progressive collapse analysis of a ship hull girder.

scholarly journals Non-linear Static Progressive Collapse Analysis of Asymmetric High Rise R.C.C. Structure

2020 ◽  
Vol 9 (9) ◽  
pp. 586-592
Keyword(s):  
Structural Model ◽  
Terrorist Attack ◽  
Progressive Collapse ◽  
Bending Moment ◽  
High Rise ◽  
Irregular Structures ◽  
Load Carrying ◽  
Collapse Analysis ◽  
A Chain ◽  
Progressive Collapse Analysis

The developments in construction make it compulsory for architects to plan the high rise structures in RCC. Unfortunately due to some reasons like gas explosion, terrorist attack, fire etc. high rise structures undergoes some major component failure. As the major component fails, sometimes part of the structure or whole structure tends to collapse. This behavior of the structure is called as progressive collapse. Progressive collapse may be a chain reaction of failures that circulates either throughout or some of the structure lopsided to the first local failure. The progressive collapse of building structure is commenced when one or more vertical load carrying members are removed. One of the important characteristics of progressive collapse is that the final damage is not related to the initial damage. In this project it is proposed to carry out progressive collapse analysis of regular and irregular structures. Structural model of building has been fashioned din ETABS and loads are applied as per GSA guidelines, for evaluation of progressive collapse nonlinear static method of analysis has been used. The analysis is done using ETABS 18 software and using codes of analysis, IS 1893: 2016, IS 456: 2016. Joint displacements, axial force, bending moment are evaluated. In all cases progressive collapse of internal column is more critical as compared to other cases.

A Guide for the Ultimate Longitudinal Strength Assessment of Ships

2004 ◽  
Vol 41 (03) ◽  
pp. 122-139
Author(s):  
Jeom Kee Paik
Keyword(s):  
Progressive Collapse ◽  
Limit State ◽  
Bending Moment ◽  
Ship Hull ◽  
Safety Measure ◽  
Ultimate Limit State ◽  
Ship Hulls ◽  
Collapse Analysis ◽  
Longitudinal Strength ◽  
Progressive Collapse Analysis

The aim of the present paper is to establish a practical guide for the ultimate longitudinal strength assessment of ships. The ultimate hull girder strength of a ship hull can be calculated using either the progressive collapse analysis method or closed-form design formulas. In the present paper, both the progressive collapse analysis method and the design formulas are presented. A comparison between the progressive collapse analysis results and the design formula solutions for merchant cargo ship hulls is undertaken. The total design (extreme) bending moment of a ship hull is estimated as the sum of the still-water and wave-induced bending moment components as usual. The safety measure of a ship hull is then defined as a ratio of the ultimate longitudinal strength to the total design bending moment. The developed guidelines are applied to safety measure calculations of merchant ship hulls with respect to hull girder collapse. It is concluded that the guidance and insights developed from the present study will be very useful for the ultimate limit state design of newly built ships as well as the safety measure calculations of existing ship hulls. The essence of the proposed guide shall form ISO code 18072-2: Ships and Marine Technology— Ship Structures—Part 2: Requirements of Their Ultimate Limit State Assessment.

Collapse Analysis of Ship Hull Girder in Waves Using Idealized Structural Unit Method

2016 ◽  
Author(s):  
Masahiko Fujikubo ◽  
Kazuhiro Iijima ◽  
Zhiyong Pei ◽  
Han Htoo Htoo Ko
Keyword(s):  
Simple Procedure ◽  
Progressive Collapse ◽  
Ship Hull ◽  
Element Formulation ◽  
Total System ◽  
Plate Element ◽  
Hull Girder ◽  
Hull Structure ◽  
Collapse Analysis ◽  
Progressive Collapse Analysis

Recent progress in the development and application of the ISUM plate element is highlighted with a particular focus on its application to the progressive collapse analysis of a ship hull structure. The plate element is characterized by idealized shape functions for defection based on buckling collapse mode and a simple procedure for element formulation similar to that for standard displacement-based finite elements. The formulation of the plate element under in-plane loads is presented, and then the plate element and the plate-stiffener combination model are applied to the progressive collapse analysis of a hull-girder cross section and double bottom structure. The development of a total system for motion/collapse analysis of a whole ship in waves is also presented. The effectiveness of these ISUM models is demonstrated.

scholarly journals Progressive Collapse Analysis of Intact and Damaged Ships under Unsymmetrical Bending

2020 ◽  
Vol 8 (12) ◽  
pp. 988
Author(s):  
Burak Can Cerik ◽  
Joonmo Choung
Keyword(s):  
Structural Damage ◽  
Progressive Collapse ◽  
Arbitrary Cross Section ◽  
Neutral Axis ◽  
Hull Girder ◽  
Adverse Conditions ◽  
Collapse Analysis ◽  
Unsymmetrical Loading ◽  
Double Hull ◽  
Progressive Collapse Analysis

This study examined the hull girder strength of intact and damaged ships by adopting the incremental-iterative method for progressive collapse analysis, which was extended to the general case of the unsymmetrical bending of beams with an arbitrary cross-section. The sources of an unsymmetrical loading, including rotation of the loading plane and section asymmetry caused by structural damage, are described. A fast and robust procedure is presented to determine the translation and rotation of the instantaneous neutral axis at each curvature increment when applying Smith’s progressive collapse analysis method. A series of analyses were conducted on a double hull VLCC and a bulk carrier, considering various loading plane angles and damage conditions. The decrease in ultimate strength and the influences of rotation of the instantaneous neutral axis and ship heeling are discussed. The proposed method can be used for a rapid and rational assessment of the hull girder strength under adverse conditions.

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