Torsional Low-Strain Test for Nondestructive Integrity Examination of Existing High-Pile Foundation
Low-strain tests are widely utilized as a nondestructive approach to assess the integrity of newly piled foundations. So far, the examination of existing pile foundations is becoming an indispensable protocol for pile recycling or post-disaster safety assessment. However, the present low-strain test...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/14/5330 |
| _version_ | 1797443849347399680 |
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| author | Yunpeng Zhang M. Hesham El Naggar Wenbing Wu Zongqin Wang |
| author_facet | Yunpeng Zhang M. Hesham El Naggar Wenbing Wu Zongqin Wang |
| author_sort | Yunpeng Zhang |
| collection | DOAJ |
| description | Low-strain tests are widely utilized as a nondestructive approach to assess the integrity of newly piled foundations. So far, the examination of existing pile foundations is becoming an indispensable protocol for pile recycling or post-disaster safety assessment. However, the present low-strain test is not capable of testing existing pile foundations. In this paper, the torsional low-strain test (TLST) is proposed to overcome this drawback. Both the upward and downward waves are considered in the TLST wave propagation model established in this paper so that a firm theoretical basis is grounded for the test signal interpretations. A concise semi-analytical solution is derived and its rationality is verified by comparisons with the existing solutions for newly piled foundations and the finite element results. The main conclusions of this study can be drawn as follows: (1). by placing the sensors where the incident wave is applied, the number of reflected signals can be minimized; (2). the defects can be more evidently identified if the incident wave/sensors are input/installed close to the superstructure/pile head. |
| first_indexed | 2024-03-09T13:03:00Z |
| format | Article |
| id | doaj.art-9c88a58cab2b44008e3bf31b30cdedb3 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T13:03:00Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-9c88a58cab2b44008e3bf31b30cdedb32023-11-30T21:52:08ZengMDPI AGSensors1424-82202022-07-012214533010.3390/s22145330Torsional Low-Strain Test for Nondestructive Integrity Examination of Existing High-Pile FoundationYunpeng Zhang0M. Hesham El Naggar1Wenbing Wu2Zongqin Wang3Faculty of Engineering, China University of Geosciences, Wuhan 430074, ChinaGeotechnical Research Centre, Department of Civil and Environmental Engineering, Western University, London, ON N6A 5B9, CanadaFaculty of Engineering, China University of Geosciences, Wuhan 430074, ChinaFaculty of Engineering, China University of Geosciences, Wuhan 430074, ChinaLow-strain tests are widely utilized as a nondestructive approach to assess the integrity of newly piled foundations. So far, the examination of existing pile foundations is becoming an indispensable protocol for pile recycling or post-disaster safety assessment. However, the present low-strain test is not capable of testing existing pile foundations. In this paper, the torsional low-strain test (TLST) is proposed to overcome this drawback. Both the upward and downward waves are considered in the TLST wave propagation model established in this paper so that a firm theoretical basis is grounded for the test signal interpretations. A concise semi-analytical solution is derived and its rationality is verified by comparisons with the existing solutions for newly piled foundations and the finite element results. The main conclusions of this study can be drawn as follows: (1). by placing the sensors where the incident wave is applied, the number of reflected signals can be minimized; (2). the defects can be more evidently identified if the incident wave/sensors are input/installed close to the superstructure/pile head.https://www.mdpi.com/1424-8220/22/14/5330nondestructive testexisting pile integritylow-strain testwave propagation |
| spellingShingle | Yunpeng Zhang M. Hesham El Naggar Wenbing Wu Zongqin Wang Torsional Low-Strain Test for Nondestructive Integrity Examination of Existing High-Pile Foundation Sensors nondestructive test existing pile integrity low-strain test wave propagation |
| title | Torsional Low-Strain Test for Nondestructive Integrity Examination of Existing High-Pile Foundation |
| title_full | Torsional Low-Strain Test for Nondestructive Integrity Examination of Existing High-Pile Foundation |
| title_fullStr | Torsional Low-Strain Test for Nondestructive Integrity Examination of Existing High-Pile Foundation |
| title_full_unstemmed | Torsional Low-Strain Test for Nondestructive Integrity Examination of Existing High-Pile Foundation |
| title_short | Torsional Low-Strain Test for Nondestructive Integrity Examination of Existing High-Pile Foundation |
| title_sort | torsional low strain test for nondestructive integrity examination of existing high pile foundation |
| topic | nondestructive test existing pile integrity low-strain test wave propagation |
| url | https://www.mdpi.com/1424-8220/22/14/5330 |
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