Validation of usefulness of damage identification method using deflection influence line based on experimental data

Abstract

The damage identification method using deflection influence line (DIL) is studied based on measured data in a damaged bridge model. Since the damage on the girders reduces the bending stiffness, a correction factor (CF) for bending stiffness is introduced as a damage index. DIL of the damaged bridge model is estimated based on MAP (Maximum A Posterior) estimation. Hyperparameters necessary for estimating the CF are calculated by maximization of marginal likelihood. Although the use of DIL calculated by MAP estimation with prior information improves the accuracy of identification of the damage locations, it is possible that the damage locations and their level are roughly identified without the prior information.