Damage will cause the variations of structural dynamic property and response.Contrarily

the structural damage may be identified by the variation of dynamic property and response.But they are not much sensitive to the local damage of structure.As the wavelet packet analysis has an excellent localized performance in time-frequency domain

it may analyse a signal in an arbitrary resolution in time-frequency domain.On the basis of wavelet packet analysis

a structural damage detection method based on wavelet packet analysis is presented in this paper.Firstly

the structural response signals are decomposed into the wavelet packet components.And then

the damage is identified by observing the variation of every wavelet signal.This method uses the data of structural response only to identify damage.The field measure is convenient and the analysis is simple.At last

the presented method was applied to detect and identification the damage time and location of frame structure successfully.Its feasibility was validated.