Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/106012
Title: The effect of prestressing force on natural frequencies of concrete beams – A numerical validation of existing experiments by modelling shrinkage crack closure
Authors: Gan, Bing-Zheng
Chiew, Sing-Ping
Lu, Yong
Fung, Tat-Ching
Keywords: Natural Frequency
Prestressing Force
Engineering::Civil engineering
Issue Date: 2019
Source: 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
Journal: Journal of Sound and Vibration
Series/Report no.: Journal of Sound and Vibration
Abstract: 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.
URI: https://hdl.handle.net/10356/106012
http://hdl.handle.net/10220/49974
ISSN: 0022-460X
DOI: 10.1016/j.jsv.2019.04.030
Rights: © 2019 Elsevier. All rights reserved. This paper was published in Journal of Sound and Vibration and is made available with permission of Elsevier.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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