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Damage Identification for Multisupported Beam Based on Wavelet Analysis

Author: ZhanLi
Tutor: LiHuiJian；GaoBaiFeng
School: Yanshan University
Course: Structural Engineering
Keywords: Continuous beam Damage Identification Lipschitz Wavelet Transform Information to expand Information truncation
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 56
Quote: 2
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Abstract


Continuous beam structure is a common form of the bridge , are widely used in engineering . Wind and seismic loads , and erosion of natural environment , certain parts of the structure will produce damage , decreased stiffness , strength and other mechanical properties of the structure , mechanical properties reduce the direct impact of the changes in the structural dynamic characteristics . The wavelet transform is a time-frequency domain analysis methods , characterized by multi-resolution analysis is a suitable tool for singularity signal analysis . Structural damage identification method based on the domestic and foreign scholars displacement variance as damage indicators , using wavelet transform to identify structural damage location and damage extent . Both field tests or numerical analysis, dynamic response collected information is limited . When wavelet transform decomposition amount will generally appear in the boundary at Gibbs phenomenon . Typical method by comparing the finite interval signal border issues , the paper proposes a method based on curve fitting technology development , and this method is verified by an example . Information to expand the use of the continuous beam stiffness change , inhibition of the Gibbs oscillation phenomena affect the continuous beam structural damage identification , to expand the scope of the wavelet transform to identify structural damage information to the structure as a whole , in particular, the structure of the boundary region ; For more continuous beam structure damage , structural damage due to injury as well as between the impact of their own seat , the location is difficult to identify . End, the introduction of the method of truncation information , so as to eliminate these effects , and combination information expanding method for processing the response information , to complete the accurate identification of the damage location . Finally, Lipschitz exponent corresponding wavelet coefficients modulus maxima point to determine the extent of the structural damage . Continuous displacement of the beam structure under moving loads variance curve continuous wavelet transform Lipschitz index with the degree of injury, location of injury , damage occurred in the number of injury between the size of the load , load speed variation .

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