Damage detection in slab-on-girder bridges using vibration characteristics

摘要

This paper develops and applies a multi-criteria procedure, incorporating changes in natural frequencies, modaludflexibility and the modal strain energy, for damage detection in slab-on-girder bridges. The proposed procedureudis first validated through experimental testing of a model bridge. Numerically simulated modal data obtainedudthrough finite element analyses are then used to evaluate the vibration parameters before and after damage andudused as the indices for assessment of the state of structural health. The procedure is illustrated by its application to full scale slab-on-girder bridges under different damage scenarios involving single and multiple damages on the deck and girders.