A global method for structural damage detection Part II: A comparative study and veri cation

To identify structural damage, many dierent methods have already been developed. Evaluating the performance of these methods is not a convenient task because they have been applied to dierent structures or constructed for specic purposes. Most of these methods use model-updating techniques, as a tool, to detect and assess damage. On the other hand some methods, including the energy index method, use the concept of strain energy to detect damage. This paper tries to compare the performance of the energy index method with the performance of a model-updating-based model. In order to facilitate the comparison of various damage identication methods, a structure proposed by the IASCASCE Task Group on Structural Health Monitoring is considered as a benchmark. Finally, the eects of measurement noise and the incompleteness of data on the performance of the proposed algorithm are investigated.