A method for detecting internal damage in emulation concrete structures was presented in this study.The effectiveness of this method was verified by an emulation concrete beam test.The piezoelectric sensors were embedded in the emulation concrete structures.A piezoelectric sensor in the specific position is selected as the actuator

while the other sensors are the receivers.A designated linear sweep sine excitation was used to drive the actuator.The variations in the measurements between the healthy state and the damage state were used to detect the damage in the structures.The received data were analyzed in time and frequency domain.And also

a wavelet based method was proposed to extract the damage-sensitive features in this study.The results show that the changes in amplitude

frequency and damage index based on wavelet packet analysis is very sensitive to damage of components.These data change trends can effectively reflect the damage extent of components.It is indicated that this kind of piezoelectric sensor can be used to damage monitoring research on dynamic model test of concrete dam.