The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure
This paper investigates the effect of prestressing force on the natural frequencies of reinforced concrete beams. From a pure theoretical point of view, such effects in different prestressing conditions appear to involve no ambiguity; however, in practice contradictory observations have been reporte...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/106012 http://hdl.handle.net/10220/49974 |
| _version_ | 1811697121604141056 |
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| author | Gan, Bing-Zheng Chiew, Sing-Ping Lu, Yong Fung, Tat-Ching |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Gan, Bing-Zheng Chiew, Sing-Ping Lu, Yong Fung, Tat-Ching |
| author_sort | Gan, Bing-Zheng |
| collection | NTU |
| description | This paper investigates the effect of prestressing force on the natural frequencies of reinforced concrete beams. From a pure theoretical point of view, such effects in different prestressing conditions appear to involve no ambiguity; however, in practice contradictory observations have been reported in existing research publications. Theoretical studies showed that natural frequencies would be decreasing or unchanged in different scenarios. On the other hand, some experiments that were conducted on prestressed concrete beams indicated an increasing trend of the natural frequencies with the prestressing force. This paper is aimed to provide a systematic explanation of the reasons causing the discrepancies and propose a coherent framework for the prediction of the natural frequencies under a prestressed condition. Numerical simulations using finite element model are carried out to simulate the influence of prestressing force on natural frequencies with the existence of the shrinkage cracks. The results demonstrate that such shrinkage-type cracks inside the concrete indeed tend to close when the prestressing force is applied, and this in turn increases the bending stiffness and consequently results in an increase of the natural frequencies of the beams. |
| first_indexed | 2024-10-01T07:50:13Z |
| format | Journal Article |
| id | ntu-10356/106012 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:50:13Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1060122021-01-29T01:35:59Z The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure Gan, Bing-Zheng Chiew, Sing-Ping Lu, Yong Fung, Tat-Ching School of Civil and Environmental Engineering Natural Frequency Prestressing Force Engineering::Civil engineering This paper investigates the effect of prestressing force on the natural frequencies of reinforced concrete beams. From a pure theoretical point of view, such effects in different prestressing conditions appear to involve no ambiguity; however, in practice contradictory observations have been reported in existing research publications. Theoretical studies showed that natural frequencies would be decreasing or unchanged in different scenarios. On the other hand, some experiments that were conducted on prestressed concrete beams indicated an increasing trend of the natural frequencies with the prestressing force. This paper is aimed to provide a systematic explanation of the reasons causing the discrepancies and propose a coherent framework for the prediction of the natural frequencies under a prestressed condition. Numerical simulations using finite element model are carried out to simulate the influence of prestressing force on natural frequencies with the existence of the shrinkage cracks. The results demonstrate that such shrinkage-type cracks inside the concrete indeed tend to close when the prestressing force is applied, and this in turn increases the bending stiffness and consequently results in an increase of the natural frequencies of the beams. Accepted version 2019-09-20T06:19:45Z 2019-12-06T22:02:53Z 2019-09-20T06:19:45Z 2019-12-06T22:02:53Z 2019 Journal Article Gan, B.-Z., Chiew, S.-P., Lu, Y., & Fung, T.-C. (2019). The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure. Journal of Sound and Vibration, 455, 20-21. doi:10.1016/j.jsv.2019.04.030 0022-460X https://hdl.handle.net/10356/106012 http://hdl.handle.net/10220/49974 10.1016/j.jsv.2019.04.030 455 20 31 en Journal of Sound and Vibration Journal of Sound and Vibration © 2019 Elsevier. All rights reserved. This paper was published in Journal of Sound and Vibration and is made available with permission of Elsevier. 21 p. application/pdf |
| spellingShingle | Natural Frequency Prestressing Force Engineering::Civil engineering Gan, Bing-Zheng Chiew, Sing-Ping Lu, Yong Fung, Tat-Ching The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure |
| title | The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure |
| title_full | The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure |
| title_fullStr | The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure |
| title_full_unstemmed | The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure |
| title_short | The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure |
| title_sort | effect of prestressing force on natural frequencies of concrete beams a numerical validation of existing experiments by modelling shrinkage crack closure |
| topic | Natural Frequency Prestressing Force Engineering::Civil engineering |
| url | https://hdl.handle.net/10356/106012 http://hdl.handle.net/10220/49974 |
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