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
|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-only; Experimental modal analysis; Post-tensioned concrete; Linear regression modelling; Fundamental bending frequency; 3-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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