Damage detection in beam-like structures using static shear energy redistribution

Abstract

In this study, a static shear energy algorithm is presented for the damage assessment of beam-like structures. According to the energy release principle, the strain energy of a damaged element suddenly changes when structural damage occurs. Therefore, the change in the static shear energy is employed to determine the damage locations in beam-like structures. The static shear energy is derived from the spectral factorization of the elementary stiffness matrix and structural deflection variation. The advantage of using shear energy as opposed to total energy is that only a few deflection data points of the beam structure are required during the process of damage identification. Another advantage of the proposed approach is that damage detection can be performed without establishing a structural finite-element model in advance. The proposed technique is first validated using a numerical example with single, multiple, and adjacent damage scenarios. A channel steel beam and rectangular concrete beam are employed as experimental cases to further verify the proposed approach. The results of the simulation and experiment examples indicate that the proposed algorithm provides a simple and effective method for defect localization in beam-like structures.

Graphical abstract

Keywords

damage detection / beam structure / strain energy / static displacement variation / energy damage index

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Acknowledgments

This study was supported by the National Natural Science Foundation of Zhejiang Province, China (No. LQ20E080013), the Natural Science Foundation of China (Grant No. 52008215), the Major Special Science and Technology Project (No. 2019B10076) of “Ningbo Science and Technology Innovation 2025” and Ningbo Natural Science Foundation Project (No. 202003N4169).

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