Automated dynamic characteristics estimation of highway bridge under ambient vibration by block companion form realization

Abstract

In this research, vibration characteristics are estimated from the ambient vibration of highway bridge by the block companion form realization theory. Two methods are stated herein such as formulation of block companion system matrix; (i) directly from block Hankel matrix, (ii) from ARMA model parameter G through Yule-Walker equation. These methods have applied to a 152m long Langer bridge and its dynamic characteristics were estimated automatically from multipoint measurement of ambient vibration. As the ambient vibration characteristics affect the estimation accuracy, two different cases were taken into consideration and the estimation accuracy was evaluated.