Prediction of structural response of naval vessels based on available structural health monitoring data

Mondoro, Alysson; Soliman, Mohamed; Frangopol, Dan M.

doi:10.1016/j.oceaneng.2016.08.012

Cited by 27 publications

(19 citation statements)

References 38 publications

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“…Yan [13] comprehensively analyzed the fatigue performance decay characteristics of different reinforced concrete bridge decks through numerical simulation and attributed concrete fatigue facture to residual strain accumulation; however, the impacts of durability factors on fatigue analysis were not considered. Frangopol [14][15] proposed a fatigue reliability evaluation method by taking into account other relevant impact factors, and the prediction results were consistent with in-situ monitoring results. Spathelf [16] studied the fatigue performance of reinforced concrete slabs under clear bending conditions and described the characteristics of internal force redistribution after a single-steel failure based on direct strain measurement results; however, fatigue analysis was limited under the influence of steel corrosion.…”

Section: State Of the Artsupporting

confidence: 63%

Numerical Analysis of Diaphragm Fatigue of Reinforced Concrete Simply Supported T-beams

Zhang¹,

Duan²,

Zheng³

et al. 2018

JESTR

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Diaphragms are important components of reinforced concrete ribbed beam bridges. Thus, diaphragm fatigue damage can seriously threaten the safety of in-service reinforced concrete ribbed beam bridges. In order to explore the fatigue performance of reinforced concrete beams and determine the internal relations between diaphragm fatigue life and fatigue load stress level, an entity analysis model of reinforced concrete simply supported T-beams was presented in this study. The spatial entity model was established by using the finite element software Midas/FEA. The correlation was analyzed on the basis of fatigue stress level, spacing-span ratio, width-height ratio, and fatigue performance of the beam diaphragms. The reliability of the calculation results was verified by using the traditional fatigue analytical methods of S-N curve and Miner linear cumulative damage theory and the methods for Goodman and Gerber correction. Results demonstrate that the fatigue life of the model beam increases and the damage degree decreases when the spacing-span ratio decreases and the width-height ratio increases. The model is economically reasonable when the diaphragm spacingspan ratio and the width-height ratio are 3.58 and 0.17, respectively. The study can provide references for further improving the anti-fatigue design of reinforced concrete diaphragm beams.

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Section: State Of the Artsupporting

confidence: 63%

Numerical Analysis of Diaphragm Fatigue of Reinforced Concrete Simply Supported T-beams

Zhang¹,

Duan²,

Zheng³

et al. 2018

JESTR

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“…NDT testing techniques are well researched and give results with usually sufficient reliability [ 10 , 11 , 12 , 13 , 14 ]. However, they have a fundamental disadvantage—they are carried out periodically.…”

Section: Introductionmentioning

confidence: 99%

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

Szeleziński

Muc

Murawski

et al. 2021

Sensors

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The paper presents the measurement process and test results for six thin-walled plates with different dynamic characteristics caused by different defects of welded joints. The tests were carried out using non-destructive testing (NDT). The authors made an attempt to determine the validity of the use and degree of effectiveness of the tests based on laser vibrometry in detecting defects in welded joints. The tests of welded plates were carried out using displacement laser sensors and piezoelectric accelerometers, while the source of vibration extortion was a modal hammer. In the adopted measurement methodology, the application of accelerometers was to obtain the reference data, which allowed for comparison with the measurement data obtained from the laser vibrometer. The analysis of the obtained measurement data, in the fields of time and frequency, made it possible to verify the correctness of the data obtained by means of laser vibrometry and to determine the requirements which are necessary for the correct performance of NDT tests and in the future structural health monitoring (SHM) system of welded joints with the use of a laser vibrometer. The mathematical model developed in the MSC software Pastran-Nastran was also used in the work. The model was developed for the purpose of mutual verification of the measurement and calculation tests. At the present stage of work, it can be stated that the results obtained by laser vibrometry methods should be treated as a supplement to the research conducted with traditional piezoelectric accelerometers. In certain situations, they can be used as an alternative to accelerometers, due to the fact that laser sensors do not require direct contact with the examined object. Where the object under test may be in a strong electromagnetic field, optical sensors are better suited than contact sensors.

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“…Damage due to slamming includes distortion of the internal frames in the centre bow area and shell buckling (Amin, 2009;Thomas, 2003). Slamming can also lead to crack initiation and reduction of the fatigue life (Frangopol, 2016;Mondoro et al, 2016;Soliman et al, 2015;Thomas et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Centre bow and wet-deck design for motion and load reductions in wave piercing catamarans at medium speed

Shabani

Lavroff

Holloway

et al. 2019

Ships and Offshore Structures

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For wave piercing catamarans (WPCs), the centre bow length and tunnel clearance are important design factors for slamming, passenger comfort and deck diving. An experimental study was performed here to determine the influence of centre bow and wet-deck geometry on WPC motions and loads. The vertical accelerations, magnitudes of slamming loads and vertical bending moments acting on a 112 m WPC vessel were investigated at a reduced speed of 20 knots using five centre bow (CB) and wet-deck configurations: parent CB, high CB, low CB, long CB and short CB. A 2.5 m hydroelastic segmented catamaran model was used and over 200 model tests were conducted in regular head sea waves in wave heights equivalent to 2.7 m, 4.0 m and 5.4 m at full scale. It was found that increasing the wet-deck height resulted in higher vertical accelerations due to global motions but reduced the slamming loads at a speed of 1.53 m/s in model scale (20 knots full scale). The greatest peak vertical loads acting on the centre bow ranged between 18% and 105% of the total hull weight depending on the centre bow configuration and wave height. Correlation coefficients were obtained for regression models describing the relationship between the total vertical loads and the peak vertical bending moments. It was found that a reduction of speed from 38 knots to 20 knots can reduce the maximum slam loads by approximately 30% in regular waves. When considering both low and high speeds, the Short CB was found to be a consistent design for slamming reduction in comparison with the high CB.

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Prediction of structural response of naval vessels based on available structural health monitoring data

Cited by 27 publications

References 38 publications

Numerical Analysis of Diaphragm Fatigue of Reinforced Concrete Simply Supported T-beams

Numerical Analysis of Diaphragm Fatigue of Reinforced Concrete Simply Supported T-beams

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

Centre bow and wet-deck design for motion and load reductions in wave piercing catamarans at medium speed

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