Abstract
In this paper, we focus on the singularity, which appears in the acceleration response when the restoring force of structure enters into an elastic region from a plastic region. And we confirm experimentally that we can estimate the number of entering to the plastic region using the wavelet transform. The experiment is carried out using the 5th-story structural model installed by lead rubber bearing (LRB) with hysteretic characteristics of restoring force. The experiment results that wavelet transform make it possible to estimate the number of entering to the plastic region, when a non-stationary wave is inputted into a structure.
