TY - GEN
T1 - Array-measurement-based algorithm for detecting debonded regions between concrete matrix and steel reinforcing bars in concrete samples
AU - Han, Je Heon
AU - Kim, Yong Joe
AU - Pagnotta, Alex
AU - Gardoni, Paolo
PY - 2012
Y1 - 2012
N2 - The objective of this study is to develop an array measurement-based algorithm to identify debonded regions between the concrete matrix and steel reinforcing bars of concrete structures. In the proposed procedure, an impact hammer excites one end of a concrete sample and a tri-axial accelerometer is then used to measure the resulting vibration responses on both end surfaces of the sample. Then, a MUltiple SIgnal Classification (MUSIC) algorithm is used to locate the debonded regions as "passive" sources where reflective waves are generated. In order to suppress the effects of the direct waves generated from the excitation as well as the reflective waves from the boundaries at the ends of the sample that make it almost impossible to detect the subtle reflective waves from the debonded region, modified steering vectors are calculated from a finite element model of the sample including the effects of the direct and boundary-reflective waves. Then, the modified steering vectors are used to scan the concrete sample and calculate a 2-D MUSIC power map. By applying the proposed algorithm to both experimental and numerical data, it is shown that the proposed algorithm can be used to successfully detect the debonded regions of the concrete sample.
AB - The objective of this study is to develop an array measurement-based algorithm to identify debonded regions between the concrete matrix and steel reinforcing bars of concrete structures. In the proposed procedure, an impact hammer excites one end of a concrete sample and a tri-axial accelerometer is then used to measure the resulting vibration responses on both end surfaces of the sample. Then, a MUltiple SIgnal Classification (MUSIC) algorithm is used to locate the debonded regions as "passive" sources where reflective waves are generated. In order to suppress the effects of the direct waves generated from the excitation as well as the reflective waves from the boundaries at the ends of the sample that make it almost impossible to detect the subtle reflective waves from the debonded region, modified steering vectors are calculated from a finite element model of the sample including the effects of the direct and boundary-reflective waves. Then, the modified steering vectors are used to scan the concrete sample and calculate a 2-D MUSIC power map. By applying the proposed algorithm to both experimental and numerical data, it is shown that the proposed algorithm can be used to successfully detect the debonded regions of the concrete sample.
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M3 - Conference contribution
AN - SCOPUS:84883586061
SN - 9781627485609
T3 - 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012
SP - 10100
EP - 10110
BT - 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012
T2 - 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012
Y2 - 19 August 2012 through 22 August 2012
ER -