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

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.

Automated summary

This study presents a static shear energy algorithm for the damage assessment of beam-like structures. The algorithm uses the change in static shear energy to determine the damage locations, making use of the spectral factorization of the stiffness matrix and structural deflection variation. One advantage is that it only requires a few deflection data points for damage identification. Another advantage is that it does not require a finite-element model to be established in advance. The proposed algorithm is validated through numerical examples and experimental cases, showing its effectiveness in defect localization.