Abstract
The PSC box girder bridge is a pre-stressed box girder bridge that accounts for a considerable part of large-scale bridges. However, when concrete is poured, even small mistakes might result in voids that appear during long-term maintenance. In this paper, we present a technique for detecting the void in the duct inside the PSC box girder bridge. Data are acquired utilizing the non-destructive impact-echo (IE) approach to detect these voids. IE creates time-series data as signal data initially; however, we want to use a CNN auto-encoder (AE). A scalogram, which is a kind of wavelet transformation, is used to convert time series data into an image. An AE is a type of unsupervised learning that aims to minimize the difference between the input and output. By comparing histograms, the difference is calculated. To begin, we create scalogram images from all IE signal data, which were randomly sampled as 98% normal and 2% void. The CNN AE is then trained and evaluated utilizing all the data. Finally, we examine the input and output histogram similarity distributions. As a consequence, only 4% of the normal data had a similarity of less than two standard deviations from the mean, whereas 34.7% of the void data did. As a result, the existence of voids inside the PSC duct could be demonstrated to be predictive in the absence of annotated data.
Highlights
Concrete has a high compressive strength but a low flexural strength
Pre-stressed concrete (PSC) is a type of concrete that was created to compensate for these shortcomings
PSC box girder bridges account for more than 90% of all high-speed railway bridges built to date, making them the most often used bridge type
Summary
Concrete has a high compressive strength but a low flexural strength. Pre-stressed concrete (PSC) is a type of concrete that was created to compensate for these shortcomings.PSC box girder bridges account for more than 90% of all high-speed railway bridges built to date, making them the most often used bridge type. Concrete has a high compressive strength but a low flexural strength. Pre-stressed concrete (PSC) is a type of concrete that was created to compensate for these shortcomings. PSC box girder bridges account for more than 90% of all high-speed railway bridges built to date, making them the most often used bridge type. If the PSC box girder bridge is appropriately constructed, the national SOC project cost may be reduced [1]. Because the inner diameter of the duct is so tiny, when concrete is poured immediately on site, the construction precision may be reduced. A void inside the duct may appear if the girder bridge is maintained for an extended period of time. Internal exploration work to verify the stability of the PSC box girder bridge is crucial in order to avoid this
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