Abstract
This paper presents a relatively simple but quite effective identification methodology based on absolute acceleration response measurements. The proposed methodology consists of two stages. In the first stage, the first few modal vectors of a structure are estimated by utilizing the proper orthogonal decomposition technique. In the second stage, the bandpass-filtered input ground acceleration is initially estimated from the obtained modal vectors. Then, with the obtained input ground acceleration employed as an input, absolute acceleration responses subjected to the bandpass filter are used as an output vector in the ARX model-based identification. This ARX model provides more precise modal characteristics of a structure and updates the input ground acceleration time history. The concept of the proposed approach is presented and its validity is demonstrated by conducting numerical simulations and scale model experiments.
