wavelet transform;  curvature mode;  Damage identification

Wavelet transform has the ability to characterize the local characteristics of signals in the time and frequency domains, and can amplify and identify abrupt signals in structural responses at different scales. Based on the curvature mode, a beam structure damage recognition method based on wavelet transform is proposed. The wavelet transform of the curvature mode of the structure before and after injury is carried out by using the biorthogonal wavelet function, and the structural damage index is established through the change and distribution of the wavelet transform coefficient, which can determine the existence of damage, determine the damage location and estimate the degree of damage. The method is verified by numerical simulation of T-shaped cross-section beam in a simple supported beam bridge.