Seismic Damage Evaluation of Recycled Concrete Frame Using Wavelet Transform

摘要

According to the pseudo static tests on a two-storey and single-span concrete frame made with recycled aggregates, the failure pattern, hysteresis loop curves, displacement ductility of the recycled aggregate concrete frame are investigated.The time histories of loads and displacements are decomposed to four different levels by using the wavelet packet transform.Based on the decomposition coefficients on the 4th level, a seismic damage index is developed and presented in this paper.The cumulative damage process of this recycled aggregate concrete frame under low reverse cyclic loading is also analyzed by using this damage index.The experiment results clearly indicate that recycled aggregate concrete frames have excellent seismic behaviors.The damage index given in this paper can accurately and effectively reflect the severity of damage for structures under different loading states.