Residual ultimate strength of stiffened box girder with coupled damage of pitting corrosion and a crack under vertical bending moment

2021 ◽  
Vol 235 ◽  
pp. 109341
Author(s):  
Dongyang Li ◽  
Liang Feng ◽  
Dingyu Huang ◽  
Hongda Shi ◽  
Shuqing Wang
Keyword(s):  
Ultimate Strength ◽  
Pitting Corrosion ◽  
Bending Moment ◽  
Box Girder ◽  
Vertical Bending Moment

Experimental Determination of the Ultimate Strength of Box Girder Specimens

2016 ◽  
Author(s):  
Thomas Lindemann ◽  
Patrick Kaeding ◽  
Eldor Backhaus
Keyword(s):  
Finite Element ◽  
Experimental Determination ◽  
Ultimate Strength ◽  
Progressive Collapse ◽  
Bending Moment ◽  
Element Model ◽  
Experimental Results ◽  
Bending Test ◽  
Box Girder

The Finite Element Method (FEM) is a feasible tool to perform progressive collapse analyses of large structural systems. Despite enormous developments in finite element formulations and computer technologies the results of structural analyses should be validated against experimental results. In this paper the collapse behaviour of two identical box girder specimens is determined experimentally for the load case of pure longitudinal bending. The specimens are composed of stiffened plate panels and connected at either ends to a loading structure. Within a 4-point bending test a constant bending moment is applied to each specimen to determine the collapse behaviour even in the post-ultimate strength range. The results of the experimental determination of the ultimate strength are presented for the box girder specimens. To simulate the collapse behaviour a finite element model is used and validated against experimental results.

Experimental and numerical analysis of ultimate strength of inland catamaran subjected to vertical bending moment

2019 ◽  
Vol 188 ◽  
pp. 106320 ◽  
Author(s):  
Shuangxi Xu ◽  
Bin Liu ◽  
Y. Garbatov ◽  
Weiguo Wu ◽  
C. Guedes Soares
Keyword(s):  
Numerical Analysis ◽  
Ultimate Strength ◽  
Bending Moment ◽  
Vertical Bending Moment

Examination of Effect of Lateral Loads on the Hull Girder Ultimate Strength of Large Container Ships

2016 ◽  
Author(s):  
Toshiyuki Matsumoto ◽  
Toshiyuki Shigemi ◽  
Mitsuhiko Kidogawa ◽  
Kinya Ishibashi ◽  
Kei Sugimoto
Keyword(s):  
Ultimate Strength ◽  
Bending Moment ◽  
Lateral Loads ◽  
Hull Girder ◽  
Local Strength ◽  
The Difference ◽  
Collapse Behavior ◽  
Large Container ◽  
Vertical Bending Moment

It is known that the hull girder ultimate strength with consideration of lateral loads such as bottom sea pressures and/or cargo loads generally decreases than that without consideration of the lateral loads (i.e. the effect of lateral loads). In this study a series of elasto-plastic analyses of three cargo holds models, which can reproduce the collapse behavior of the hold structures subjected to both vertical bending moment and lateral loads such as bottom sea pressures, container cargo loads etc., were carried out on a number of container ships with various sizes, and the hull girder ultimate strength obtained through the analyses were comparatively examined focusing on the effect of the lateral loads. As results of the examination, it has been concluded that local strength of the double bottom structure against the lateral loads is closely related to the hull girder ultimate strength in the case of container ships, the effect of the lateral loads on the hull girder ultimate strength varies among container ships due to the difference of construction of the double bottom structure and it is important to assess the hull girder ultimate strength explicitly taking into consideration the effect of the lateral loads for large container ships such as Post-Panamax sizes.

scholarly journals KEKUATAN BATAS LAMBUNG KAPAL DALAM MENAHAN MOMEN LENTUR VERTIKAL

2019 ◽  
Vol 22 (1) ◽  
pp. 56-61
Author(s):  
Azhar Aras Mubarak
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ultimate Strength ◽  
Internal Waves ◽  
External Load ◽  
Bending Moment ◽  
Box Model ◽  
Ship Structure ◽  
Vessel Structure ◽  
Vertical Bending Moment

On the life, the ship will constantly get the structural load caused by the external load of the internal waves and loads of the ship's load and the structure itself which then reaches the ultimate strength of the structure. This study aims to determine the strength of the boundary of the hull due to the vertical bending moment so that the ship structure can be guaranteed security. The analysis was done by using finite element method (FEM) by modeling the structure of the tanker section modified based on the shape of the girder box so that a simpler model is obtained. This calculation is done by using ANSYS 17 software. The calculation of vessel structure is simulated based on two existing models namely girder box model and modified tanker model. In the girder box model, ultimate strength is obtained at 6,311 x 108 Nmm for hogging conditions and -6.311 x 108 Nmm for sagging conditions. While on the tanker model, the ultimate strength obtained is -8.99 x 1012 Nmm for sagging conditions and 1.0277 x 1013 Nmm for hogging conditions.

scholarly journals Analisis Jarak Gading dan Kekuatan Batas Struktur Kapal Ferry Ro-ro

2019 ◽  
Vol 22 (1) ◽  
pp. 15-19
Author(s):  
Amalia Ika Wulandari
Keyword(s):  
Ultimate Strength ◽  
Bending Moment ◽  
Classification Rules ◽  
Load Redistribution ◽  
Smith Method ◽  
Load Limit ◽  
Ultimate Moment ◽  
Vertical Bending Moment ◽  
Better Than

  Abstrak Perkembangan peraturan konstruksi tidak lagi mengatur jarak gading. Sehingga para perancang kapal merencanakan jarak gading yang optimal dengan batasan resiko tekuk pada pelat menurut peraturan klasifikasi, momen batas struktur kapal harus sama dengan atau lebih besar dari 1.2 kali momen lentur vertikal (sagging dan hogging). Momen lentur vertikal dihitung dengan menggunakan formulasi yang telah diberikan oleh BKI. Penelitian ini bertujuan untuk mengetahui kekuatan batas pada struktur kapal ferry Ro-Ro yang membandingkan hasil dari dua metode yaitu Metode Smith dan NLFEA. Ro-Ro adalah kapal yang menangani muatannya dengan cara rolling it on and off di atas single or series ramps. Ramps yang dapat bekerja baik saat di kapal dan dermaga. Pada penelitian ini menunjukkan perbandingan nilai hasil dari metode NLFEA lebih besar daripada metode Smith. Hal ini dikarenakan metode NLFEA dapat menghitung redistribusi beban dan interaksi antara kegagalan lokal dan global secara kompleks sehingga keakuratan hasil perhitungan metode NLFEA lebih baik daripada metode Smith. Semakin jauh jarak gading maka semakin kecil beban batas agar pelat mengalami tekuk.   Kata Kunci: Kapal Ro-Ro,  Penampang Melintang, Jarak Gading, Tekuk, Kekuatan Batas   Abstract The development of construction's regulation is no longer determining the distance of the frame. Hence, the designers make the optimal frame distance plan with the ultimate risk of bending on the plate. According to the classification rules, the structure's ultimate moment must be equal to or greater than 1.2 times vertical bending moment (sagging and hogging). This study aims to determine the ultimate strength on the structure of a Ro-Ro ferry which comparing two methods between the Smith and NLFEA Methods. Ro-Ro is a ship that handles its cargo by rolling it on and off over a single or ramp series. Ramps that can work well on board and dock. The use of ANSYS application that applied NLFEA method in this study shows the comparison of result value of NLFEA method is greater than Smith method. This is because the NLFEA method can calculate load redistribution and the interaction between local and global failures in a complex way so that the accuracy of the NLFEA method is better than the Smith method. The further the ivory distance the smaller the load limit for the plate to buckling.

Analytical Study on Curved Box Girder Bridges with Minimum Horizontal Stiffeners

2019 ◽  
Author(s):  
Junichi Adachi ◽  
Takashi Yamaguchi ◽  
Kohei Funayama ◽  
Shintaro Arai ◽  
Michiaki Takao
Keyword(s):  
Ultimate Strength ◽  
Urban Areas ◽  
Structural Parameters ◽  
Bending Moment ◽  
Automatic Welding ◽  
Box Girders ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
The Web

<p>Curved box girder bridges are widely used in viaducts in urban areas, as well as highway junctions. In fabricating curved box girders, automatic welding robots cannot be applied to welding of horizontal stiffeners to the web panel due to the girder curvature and manufacturing costs increase. <span>Elimination or reduction of the number of horizontal stiffeners is desirable. In this study, </span>FE analysis was carried out varying the curvature and the width-thickness ratio of the structural components as structural parameters to propose the curved box girder bridges without horizontal stiffeners in the web panel. In order to evaluate <span>the ultimate strength, the collapse mode (buckling of lower flange, web panel or stiffeners) has been clarified considering the </span>design sectional forces such as torsional moment, bending moment and shearing force.</p><p>From the results, it was found that the curvature has little influence on the bending buckling strength of the web panels. Even if the horizontal stiffeners are eliminated, the ultimate strength doesn’t decrease until compressive flange buckling occurs. It is concluded that the ultimate strength is governed by the buckling of the compressive flange, even when the bending buckling occurs in the web panel.</p>

Post-Ultimate Strength Behavior of Very Large Floating Structure Subjected to Extreme Wave Loads

2012 ◽  
Author(s):  
Kazuhiro Iijima ◽  
Masahiko Fujikubo
Keyword(s):  
Ultimate Strength ◽  
Cross Section ◽  
Simple Formula ◽  
Bending Moment ◽  
Wave Loads ◽  
Extreme Wave ◽  
Floating Structure ◽  
Strength Behavior ◽  
Wave Induced ◽  
Vertical Bending Moment

In this paper, post-ultimate strength behavior of VLFS to extreme wave-induced loads is investigated. A mathematical model to describe the post-ultimate strength behavior of VLFS is developed taking the hydroelasticity into account. The whole VLFS is modeled by two beams on an elastic foundation connected via a nonliner rotational spring assuming that VLFS collapses amidship under severe bending moment. The model is solved numerically by using FEM. It is shown that the extent of collapse of VLFS is smaller than that of ship structures for given amplitude of vertical bending moment on condition that the structures have the same cross section and the same moment-displacement relationship. A simple formula to represent the extent of collapse of VLFS is derived. Its efficacy is shown.

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