Debonding Damage Detection and Assessment in a CFST Composite Column Using Modal Dynamic Data
Structural damage detection is one of the primary goals of structural health monitoring. Minimum safety can be provided upon timely identification of the damaged elements and appropriate decisions (repairing or replacing the damaged elements). Today, the use of concrete-filled steel tube composite c...
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| Format: | Article |
| Language: | fas |
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Sharif University of Technology
2022-11-01
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| Series: | مهندسی عمران شریف |
| Subjects: | |
| Online Access: | https://sjce.journals.sharif.edu/article_22822_bff831562c20c40baabd4713d1afb8d3.pdf |
| _version_ | 1797742437793267712 |
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| author | A. Mamazizi M. Khanahmadi K. Nobakht Vakili |
| author_facet | A. Mamazizi M. Khanahmadi K. Nobakht Vakili |
| author_sort | A. Mamazizi |
| collection | DOAJ |
| description | Structural damage detection is one of the primary goals of structural health monitoring. Minimum safety can be provided upon timely identification of the damaged elements and appropriate decisions (repairing or replacing the damaged elements). Today, the use of concrete-filled steel tube composite columns in the construction industry, especially high-rise buildings, is increasing. In these columns, the concrete core debonding from the steel tube is considered a prevalent type of damage. This study discusses the impact of such debonding on dynamic modal properties (natural frequencies and vibration mode shapes) and the detection of debonding damage area based on wavelet analysis. Debonding to a depth of 3 mm is defined as reduction of concrete stiffness in connection with the steel tube, and the column was subjected to frequency analysis. Modal information, including frequency values and vibration mode shapes, were extracted. Differences in frequency values and Modal Assurance Criterion (MAC) smaller than one were observed between primary and secondary shapes of vibrational modes due to the presence of debonded areas. The results showed that with the addition of a new debonding damaged area, the rate of reduction of frequency values increased. The damage index was proposed based on the detail coefficients obtained from discrete wavelet analysis of primary and secondary shapes of vibration modes to identify the area of detachment damage. The results demonstrated that the relative minimum and maximum values of the damage index for all modes occurred in debonding damaged areas. Moreover, the damage index values for different damaged areas were independent of each other. Indeed, the damage index values for other debonding damage situations did not change when a new debonding damaged area was added. This is a positive point in the damage detection process with multiple debonded areas because in this case, the inability to detect a debonding damaged area cannot affect the detection of other debonding damage situations. |
| first_indexed | 2024-03-12T14:40:49Z |
| format | Article |
| id | doaj.art-2ae9d43d02824221ba00d15b008e0b18 |
| institution | Directory Open Access Journal |
| issn | 2676-4768 2676-4776 |
| language | fas |
| last_indexed | 2024-03-12T14:40:49Z |
| publishDate | 2022-11-01 |
| publisher | Sharif University of Technology |
| record_format | Article |
| series | مهندسی عمران شریف |
| spelling | doaj.art-2ae9d43d02824221ba00d15b008e0b182023-08-16T07:02:41ZfasSharif University of Technologyمهندسی عمران شریف2676-47682676-47762022-11-0138.23.1536310.24200/j30.2022.59903.307522822Debonding Damage Detection and Assessment in a CFST Composite Column Using Modal Dynamic DataA. Mamazizi0M. Khanahmadi1K. Nobakht Vakili2Faculty of Civil Engineering University of KurdistanFaculty of Civil Engineering University of KurdistanFaculty of Civil Engineering University of KurdistanStructural damage detection is one of the primary goals of structural health monitoring. Minimum safety can be provided upon timely identification of the damaged elements and appropriate decisions (repairing or replacing the damaged elements). Today, the use of concrete-filled steel tube composite columns in the construction industry, especially high-rise buildings, is increasing. In these columns, the concrete core debonding from the steel tube is considered a prevalent type of damage. This study discusses the impact of such debonding on dynamic modal properties (natural frequencies and vibration mode shapes) and the detection of debonding damage area based on wavelet analysis. Debonding to a depth of 3 mm is defined as reduction of concrete stiffness in connection with the steel tube, and the column was subjected to frequency analysis. Modal information, including frequency values and vibration mode shapes, were extracted. Differences in frequency values and Modal Assurance Criterion (MAC) smaller than one were observed between primary and secondary shapes of vibrational modes due to the presence of debonded areas. The results showed that with the addition of a new debonding damaged area, the rate of reduction of frequency values increased. The damage index was proposed based on the detail coefficients obtained from discrete wavelet analysis of primary and secondary shapes of vibration modes to identify the area of detachment damage. The results demonstrated that the relative minimum and maximum values of the damage index for all modes occurred in debonding damaged areas. Moreover, the damage index values for different damaged areas were independent of each other. Indeed, the damage index values for other debonding damage situations did not change when a new debonding damaged area was added. This is a positive point in the damage detection process with multiple debonded areas because in this case, the inability to detect a debonding damaged area cannot affect the detection of other debonding damage situations.https://sjce.journals.sharif.edu/article_22822_bff831562c20c40baabd4713d1afb8d3.pdfstructural health monitoringdebonding damage detectionfrequency analysismodal assurance criterion (mac)wavelet analysis |
| spellingShingle | A. Mamazizi M. Khanahmadi K. Nobakht Vakili Debonding Damage Detection and Assessment in a CFST Composite Column Using Modal Dynamic Data مهندسی عمران شریف structural health monitoring debonding damage detection frequency analysis modal assurance criterion (mac) wavelet analysis |
| title | Debonding Damage Detection and Assessment in a CFST Composite Column Using Modal Dynamic Data |
| title_full | Debonding Damage Detection and Assessment in a CFST Composite Column Using Modal Dynamic Data |
| title_fullStr | Debonding Damage Detection and Assessment in a CFST Composite Column Using Modal Dynamic Data |
| title_full_unstemmed | Debonding Damage Detection and Assessment in a CFST Composite Column Using Modal Dynamic Data |
| title_short | Debonding Damage Detection and Assessment in a CFST Composite Column Using Modal Dynamic Data |
| title_sort | debonding damage detection and assessment in a cfst composite column using modal dynamic data |
| topic | structural health monitoring debonding damage detection frequency analysis modal assurance criterion (mac) wavelet analysis |
| url | https://sjce.journals.sharif.edu/article_22822_bff831562c20c40baabd4713d1afb8d3.pdf |
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