| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 97 === This study presents an automatic damage localization technique to identify the location of damage for buildings based on dominant frequencies shifts through incomplete measurements. First, the pattern of modal properties of an original (undamaged) building is established. Then, its pattern of dominant modal frequencies changes is obtained after earthquake excitations. The location of damage is identified through comparison of these two patterns. In general, a damage detection that requires only the change in dominant frequencies would be reliable and robust because dominant frequencies are a global measure of structural characteristics. The technique is able to evaluate a building health condition by using only one floor measurements. Moreover, a fuzzy inference system (FIS) is applied to develop the pattern recognition system. The main advantage of the FIS is its inherent robustness and ability to handle nonlinearities and uncertainties in a system. Finally, a multi-story steel frame is considered to examine the proposed damage localization technique via numerical simulation and experimental data. The advantages and limitations of the damage localization technique are also investigated.
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