Low-cycle fatigue behaviors of the elbow in a nuclear power plant piping system using the moment and deformation angle

Kim, Sung‐Wan; Choi, Hyoung-Suk; Jeon, Bub-Gyu; Hahm, Doshik

doi:10.1016/j.engfailanal.2018.10.021

Cited by 37 publications

(10 citation statements)

References 20 publications

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“…Image enhancement is the method of converting an input image to a more adequate image for special application purposes . In image enhancement, the purpose of the sharpening process is to emphasize the fine and detailed sections of an image or to enhance the blurred sections that occurred while the image was being acquired.…”

Section: Estimation Of the Cable Tension Using An Image Processing Mementioning

confidence: 99%

“…Image enhancement is the method of converting an input image to a more adequate image for special application purposes. 36,37 In image enhancement, the purpose of the sharpening process is to emphasize the fine and detailed sections of an image or to enhance the blurred sections that occurred while the image was being acquired. In this study, Laplacian was applied for the sharpening effect required to facilitate the recognition of the control points marked on the cable shapes by emphasizing the detailed sections of the cable images.…”

Section: Image Enhancementmentioning

confidence: 99%

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Image‐based back analysis for tension estimation of suspension bridge hanger cables

Kim

Cheung

Park³

et al. 2020

Struct Control Health Monit

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Summary In suspension bridges, hanger cables are the main load‐supporting members. The tension of the hanger cables of a suspension bridge is a very important parameter for assessing the integrity and safety of the bridge. In general, indirect methods are used to measure the tension of the hanger cables of a suspension bridge in use. A representative indirect method is the vibration method, which extracts modal frequencies from the cables' responses and then measures the cable tension using the cables' geometric conditions and the modal frequencies. In this study, ambient vibration tests were conducted on a suspension bridge in use to verify the validity of the image‐based back analysis method, which can estimate the tension of remote hanger cables using the modal frequencies as a parameter. The tension estimated through back analysis, which was conducted to minimize the difference between the modal frequencies calculated using finite element analysis of the hanger cables and the measured modal frequencies, was compared with that measured using the vibration method. It was confirmed that reliable tension estimation is possible even with low‐order modal frequencies when the image‐based back analysis method is used.

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Section: Estimation Of the Cable Tension Using An Image Processing Mementioning

confidence: 99%

Section: Image Enhancementmentioning

confidence: 99%

Image‐based back analysis for tension estimation of suspension bridge hanger cables

Kim

Cheung

Park³

et al. 2020

Struct Control Health Monit

View full text Add to dashboard Cite

show abstract

“…The purpose of applying the image enhancement method [23,31,32] to an image is to convert the image for a special application. In this study, image enhancement methods in the spatial domain were applied to measure the response by distinguishing between the structure and the background, which have similar gray levels.…”

Section: Image Enhancementmentioning

confidence: 99%

Non-Contact Water Level Response Measurement of a Tubular Level Gauge Using Image Signals

Kim

Park

Jeon

et al. 2020

Sensors

Self Cite

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The occurrence of excessive fluid sloshing during an earthquake can damage structures used to store fluids and can induce secondary disasters, such as environmental destruction and human casualties, due to discharge of the stored fluids. Thus, to prevent such disasters, it is important to accurately predict the sloshing behavior of liquid storage tanks. Tubular level gauges, which visually show the fluid level of a liquid storage tank, are easy to install and economical compared to other water level gauges. They directly show the fluid level and can be applied for various fluids because they can be constructed with various materials according to the fluid characteristics and the intended use. Therefore, in this study, the shaking table test was conducted to verify the validity of the method for measuring the water level response of the tubular level gauge installed on a liquid storage tank using image signals. In addition, image enhancement methods were applied to distinguish between the float installed in the tubular level gauge and the gray level of the background.

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“…Specifically, a study was conducted to investigate the limit states of Based on this background, several researchers have conducted studies to determine the seismic safety of piping systems. Specifically, a study was conducted to investigate the limit states of T-joints [5,6], elbows [7,8], etc., which were structurally fragile components of the piping system, through a dynamic cyclic test for the piping. In addition, studies have been carried out to experimentally and analytically investigate the earthquake responses of actual piping subjected to ground shaking [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Efficient Seismic Fragility Analysis for Large-Scale Piping System Utilizing Bayesian Approach

Kwag

Ryu

2020

Applied Sciences

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In the event of an earthquake, it is essential to accurately assess the seismic fragility of piping systems to ensure the continued safety of society. When evaluating the seismic fragility of a piping system, which is generally a secondary structural system, this should mainly be an integrated model that includes both the primary structural frames and the secondary ones, unlike the primary structural system of a building. Hence, the piping seismic fragility evaluation has an issue in that it takes considerable computational time because numerical analyses must be performed on a relatively complex model. Given this background, the purpose of this study is to propose an efficient piping seismic fragility analysis method by utilizing the existing seismic fragility analysis method and the Bayesian updating concept. In order to verify the validity of the proposed method, it was applied to a building–piping coupled structural system example, and its results were analyzed and compared with the results of the existing method in terms of accuracy and efficiency. As a result, the proposed method showed a similar accuracy compared with the existing method while significantly reducing the numerical cost of nonlinear seismic response analyses necessary for these results.

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Low-cycle fatigue behaviors of the elbow in a nuclear power plant piping system using the moment and deformation angle

Cited by 37 publications

References 20 publications

Image‐based back analysis for tension estimation of suspension bridge hanger cables

Image‐based back analysis for tension estimation of suspension bridge hanger cables

Non-Contact Water Level Response Measurement of a Tubular Level Gauge Using Image Signals

Efficient Seismic Fragility Analysis for Large-Scale Piping System Utilizing Bayesian Approach

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