The effect of prestress force magnitude and eccentricity on the natural bending frequencies of prestressed concrete structures

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Title: The effect of prestress force magnitude and eccentricity on the natural bending frequencies of prestressed concrete structures
Authors: Noble, Darragh
Nogal, Maria
O'Connor, Alan
Pakrashi, Vikram
Permanent link: http://hdl.handle.net/10197/10439
Date: 17-Mar-2016
Online since: 2019-05-14T11:29:29Z
Abstract: This paper describes the outcome of static 3-point bending testing and output-only experimental modal analysis on 9 post-tensioned concrete beams. Static 3-point bending testing and dynamic impact testing were conducted on each of the 9 beams at different levels of post-tensioning force. The Fast Fourier Transform (FFT) was implemented on the dynamic accelerometer impact data, and the fundamental frequencies of the simply supported post-tensioned concrete beams were determined by a peak-picking algorithm at each post-tensioning load level. The tests were repeated 10 times at each impact location to ensure repeatability of the experiment. There were 3 impact locations per post-tensioning load level, and there were 11 post-tensioning load levels at which the beams were tested. A first-order linear regression model was then applied to the measured fundamental bending frequencies with increasing post-tensioning load. Statistical significance tests were subsequently conducted on the recorded data to determine if any statistically significant changes in fundamental bending frequency with increasing post-tensioning load was observed, for both static and dynamic results. The results obtained for the static 3-point bending tests were then compared and contrasted with the results obtained from dynamic testing. No statistically significant relationship between natural frequency and post-tensioning load level was found for these uncracked concrete beams.
Funding Details: Irish Research Council
Type of material: Journal Article
Publisher: Elsevier
Journal: Journal of Sound and Vibration
Volume: 365
Start page: 22
End page: 44
Copyright (published version): 2015 Elsevier
Keywords: Output-onlyExperimental modal analysisPost-tensioned concreteLinear regression modellingFundamental bending frequency3-point bending tests
DOI: 10.1016/j.jsv.2015.11.047
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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