Abstract
To eliminate the influence of excitation on the wavelet packet frequency band energy spectrum (ES), ES is acquired via wavelet packet decomposition of a virtual impulse response function. Based on ES, a character frequency band vector spectrum and damage eigenvector spectrum (DES) are created. Additionally, two damage identification indexes, the energy ratio standard deviation and energy ratio variation coefficient, are proposed. Based on the damage index, an updated damage identification method for retaining wall structures is advanced. The damage state of a retaining wall can be diagnosed through DES, the damage location can be detected through the damage index trend surface, and the damage intensity can be identified by establishing a quantitative relationship between the damage intensity and damage index. To verify the feasibility and validity of this damage identification method, a vibration test on a pile plate retaining wall is performed. Test results demonstrate that it can distinguish whether the retaining wall is damaged, and the location of partial damage within the retaining wall can be easily detected; in addition, the damage intensity of the wall can also be identified validly. Consequently, this damage identification theory and method may be used to identify damage within retaining wall structures.
Highlights
Engineering structures or structural components might become damaged due to such factors as variations of their surroundings, load changes, and material degradation
This method can only be used to detect whether the truss of frame structures is damaged or not; the partial damage location and damage intensity cannot be identified through this method
energy spectrum (ES) that is directly based on structural dynamic responses caused by excitation is not suitable for damage identification
Summary
Engineering structures or structural components might become damaged due to such factors as variations of their surroundings, load changes, and material degradation. It is difficult to validly detect damage within retaining wall structures through inherent characteristics. The damage identification method based on wavelet decomposition of structure dynamic response has better sensitivity and robustness compared with other methods [21], and this approach has been widely used in building structures and bridge structures [22, 23]. This method has much dependence on external excitation. By performing a vibration test on a pile plate retaining wall, damage within this wall was detected through the updated damage identification method
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