TY - JOUR
T1 - A new index for damage identification in beam structures based on modal parameters
AU - Taghipour, Reza
AU - Nashta, Mina Roodgar
AU - Bozorgnasab, Mohsen
AU - Mirgolbabaei, Hessam
N1 - Publisher Copyright:
© 2021. The Author(s).
PY - 2021
Y1 - 2021
N2 - The structural damages can lead to structural failure if they are not identified at early stages. Different methods for detecting and locating the damages in structures have been always appealing to designers in the field. Due to direct relation between the stiffness, natural frequency, and mode shapes in the structure, the modal parameters could be used for the purpose of detecting and locating the damages in structures. In the current study, a new damage indicator named “DLI” is proposed, using the mode shapes and their derivatives. A finite element model of a beam is used, and the numerical model is validated against experimental data. The proposed index is investigated for two beams with different support conditions and the results are compared with those of two well-known indices – MSEBI and CDF. To show the capability and accuracy of the proposed index, the damages with low severity at various locations of the structures containing the elements near the supports were investigated. The results under noisy conditions are investigated by considering 3% and 5% noise on modal data. The results show a high level of accuracy of the proposed index for identifying the location of the damaged elements in beams.
AB - The structural damages can lead to structural failure if they are not identified at early stages. Different methods for detecting and locating the damages in structures have been always appealing to designers in the field. Due to direct relation between the stiffness, natural frequency, and mode shapes in the structure, the modal parameters could be used for the purpose of detecting and locating the damages in structures. In the current study, a new damage indicator named “DLI” is proposed, using the mode shapes and their derivatives. A finite element model of a beam is used, and the numerical model is validated against experimental data. The proposed index is investigated for two beams with different support conditions and the results are compared with those of two well-known indices – MSEBI and CDF. To show the capability and accuracy of the proposed index, the damages with low severity at various locations of the structures containing the elements near the supports were investigated. The results under noisy conditions are investigated by considering 3% and 5% noise on modal data. The results show a high level of accuracy of the proposed index for identifying the location of the damaged elements in beams.
KW - Beam
KW - Cracks
KW - Damage detection
KW - Finite element model
KW - Mechanical failure
KW - Modal parameters
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U2 - 10.24425/ame.2021.138397
DO - 10.24425/ame.2021.138397
M3 - Article
AN - SCOPUS:85119580479
SN - 0004-0738
VL - 68
SP - 375
EP - 394
JO - Archive of Mechanical Engineering
JF - Archive of Mechanical Engineering
IS - 4
ER -