| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 105 === The main material for a smart aggregate is piezoelectric ceramic material in this study. The smart aggregate can be used as actuator to excite stress wave, or the smart aggregate can be used as sensor to receive stress wave. This study applies the smart aggregates to damage detection of RC beam-column structures. There were two experiments in this study which was adopted the displacement control method. The first experiment was high-strength reinforced concrete beam specimen under monotonic loading. The sensors were pre-embedded, and the actuators were post-embedded. The second experiment was reinforced concrete column specimen under reversed cyclic loading. The column specimens had different failure mechanisms. One was flexural failure, another was flexural-shear failure and the other was shear failure. The sensors and the actuators were post-embedded. The actuators excite stress wave, and the amplitude of the stress wave will be attenuated due to cracks in the specimen. The sensors receive stress wave and damage index can be calculated by analyzing the sensor wave. We can evaluate damage degree by damage index, and explore the relationship between damage index and four factors. One is the location of the sensor, another is the total crack width, another is the longest crack length, and the other is specimen damage level.
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