Many of Vibration-based structural health monitoring (SHM) often uses vibrationcharacteristics to detect damage. It has been acknowledged that changes in vibrationcharacteristics can also happen due to environmental factors. Especially for civilstructures it is impossible to test in isolation from natural environment. Theseenvironmental factors are seen to significantly affect modal frequencies and caneasily mask changes caused by damage. In this study we propose a technique thattreats temperature variations as embedded parameter and helps to define acorrelation structure between modal frequencies. The proposed method utilizes thecorrelation between structural frequencies to represent the healthy state of thestructure. Damage is detected by measuring deviation of the recorded frequencyfrom the healthy state. The proposed damage detection strategy is tested usingsimulation result for a simply supported T-beam section bridges.
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