Damage recognition method used for retaining wall structural system

Abstract

The invention relates to a damage recognition method used for a retaining wall structural system. The method includes the following steps that a retaining wall is continuously excited through an exciting device; a power response signal of the retaining wall is acquired through a sensor and is transmitted to a signal acquisition system; an acquired signal is processed through a computer to obtain a virtual pulse response function signal; the computer is used for performing wavelet packet decomposition on the virtual pulse response function signal; wavelet packet frequency-band energy spectral analysis is performed on signals subjected to wavelet packet decomposition, and a wavelet packet characteristic frequency band vector spectrum is established; a wavelet packet damage characteristic vector spectrum is constructed, and whether the retaining wall is damaged or not is judged through the wavelet packet damage characteristic vector spectrum; if the retaining wall is damaged, the damage position of the retaining wall is diagnosed through a damage index distribution diagram; and the retaining wall damage degree is recognized through the quantitative relation between a damage index and the damage degree. The method is high in sensitivity, good in reliability, convenient to conduct and efficient; whether the retaining wall is damaged or not can be sensitively recognized, the local damage position of the retaining wall can be effectively diagnosed, the retaining wall damage degree can be effectively recognized, and a robustness is good; and the method belongs to a non-destructive testing method and cannot damage a structure.

Description

technical field

[0001] The invention belongs to the technical field of retaining wall health diagnosis, and relates to a damage identification method for a retaining wall structural system. Background technique

[0002] At present, most of the damage identification methods for civil engineering structures are aimed at structural components such as beams, slabs, and columns, or for structural forms such as building structures and bridge structures. However, there are relatively few damage identification methods for geotechnical retaining structures such as retaining walls. In addition, most of the existing damage identification methods for retaining wall structures are based on the dynamic parameter method, but for retaining wall structures, the impact of local damage on their dynamic parameters (such as frequency, mode shape, etc.) is very weak. Moreover, local damage often has a great influence on the high-order mode shapes of the retaining wall structure, but due to the l...

Examples

Embodiment Construction

[0037] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] figure 1 It is a schematic block diagram of the method of the present invention. This method analyzes the dynamic response of the retaining wall under external excitation for retaining structures such as the retaining wall. By extracting the virtual impulse response function between the dynamic responses of the structure, based on the wavelet packet signal Analysis technology, create wavelet packet characteristic frequency band vector spectrum, and then construct wavelet packet damage characteristic vector spectrum, judge whether the retaining wall is damaged through the damage characteristic vector spectrum; diagnose the damage position of the retaining wall through the damage identification index distribution map; Quantitative relationship between damage indicators to identify the degree of damage to the retaining wall. The method...

technical field

[0001] The invention belongs to the technical field of retaining wall health diagnosis, and relates to a damage identification method for a retaining wall structural system. Background technique

[0002] At present, most of the damage identification methods for civil engineering structures are aimed at structural components such as beams, slabs, and columns, or for structural forms such as building structures and bridge structures. However, there are relatively few damage identification methods for geotechnical retaining structures such as retaining walls. In addition, most of the existing damage identification methods for retaining wall structures are based on the dynamic parameter method, but for retaining wall structures, the impact of local damage on their dynamic parameters (such as frequency, mode shape, etc.) is very weak. Moreover, local damage often has a great influence on the high-order mode shapes of the retaining wall structure, but due to the l...

Examples

Embodiment Construction

[0037] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] figure 1 It is a schematic block diagram of the method of the present invention. This method analyzes the dynamic response of the retaining wall under external excitation for retaining structures such as the retaining wall. By extracting the virtual impulse response function between the dynamic responses of the structure, based on the wavelet packet signal Analysis technology, create wavelet packet characteristic frequency band vector spectrum, and then construct wavelet packet damage characteristic vector spectrum, judge whether the retaining wall is damaged through the damage characteristic vector spectrum; diagnose the damage position of the retaining wall through the damage identification index distribution map; Quantitative relationship between damage indicators to identify the degree of damage to the retaining wall. The method...

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