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- Title
Analysis for the Compactness Characteristic Parameters of CFST Based on Ultrasonic Acoustic Parameters.
- Authors
LING Ganzhan; XIE Weiwei; TANG Ruikai; CAO Lu; LIANG Ming; DING Zihao
- Abstract
Using ultrasonic testing technology, the compactness of concrete filled steel tubes (CFST) can be measured. Field tests were conducted on five CFST arch bridges and 252 groups of seven CFST specimens in order to examine the correlation between characteristics such as compressive strength of concrete, detection age, diameter of steel pipe and ultrasonic acoustic parameters. Then the distribution type of ultrasonic acoustic parameter sample data was determined based on the K - S test (Kolmogorov-Smirnov test). In addition, the optimal parameter combination of the ultrasonic acoustic parameter and the characteristic parameter was determined by the correlation analysis, and the quantitative relationship between the ultrasonic acoustic parameter and the characteristic parameter was established. Analysis shows that the statistical distribution of ultrasonic acoustic parameters generally follows a normal distribution. Additionally, as the detection age increases, the statistical distribution of ultrasonic acoustic parameters tends to increase and is typically convergent. When there are in-pipe steel structures, such as stiffening plates and flanges, in the survey area, the ultrasonic wave velocity may be slightly increased by 3% to 5%, while the amplitude and frequency may be reduced by 12% to 18% and 18% to 20%. Ultrasonic acoustic parameters have a strong correlation with compressive strength of concrete, detection age, and diameter of steel pipe. It means that ultrasonic acoustic parameters increases linearly and logarithmically with the increase of compressive strength of concrete and detection age, respectively, and then decrease logarithmically with the increase of diameter of steel pipe.
- Publication
Railway Standard Design, 2023, Vol 67, Issue 12, p121
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202205240001