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

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dc.contributor.authorNoble, Darragh-
dc.contributor.authorNogal, Maria-
dc.contributor.authorO'Connor, Alan-
dc.contributor.authorPakrashi, Vikram- Elsevieren_US
dc.identifier.citationJournal of Sound and Vibrationen_US
dc.description.abstractThis 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.en_US
dc.description.sponsorshipIrish Research Councilen_US
dc.rightsThis is the author’s version of a work that was accepted for publication in Journal of Sound and Vibration. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Sound and Vibration (365, (2015))
dc.subjectExperimental modal analysisen_US
dc.subjectPost-tensioned concreteen_US
dc.subjectLinear regression modellingen_US
dc.subjectFundamental bending frequencyen_US
dc.subject3-point bending testsen_US
dc.titleThe effect of prestress force magnitude and eccentricity on the natural bending frequencies of prestressed concrete structuresen_US
dc.typeJournal Articleen_US
dc.statusPeer revieweden_US
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