| 英文摘要 |
Structural health monitoring of concrete structures under seismic loads always attracted much attention in the earthquake engineering community. In this paper, a piezoceramic-based device, called “smart aggregate”, is proposed for the structural health monitoring of concrete structures under earthquake loading. A concrete column instrumented with smart aggregates was used as a testing object. A shake table was utilized to simulate the earthquake ground motion for the testing object. During the shake table tests, the distributed piezoceramic-based smart aggregates embedded in the concrete column were used to perform the structural health monitoring. For the health monitoring purpose, one smart aggregate was used as an actuator to generate propagating waves, and the other smart aggregates are used as sensors to detect the waves. By analyzing the wave response, the existence of crack can be detected and the severity can be estimated. A damage index matrix was developed to evaluate the damage status of the structure. The experimental results demonstrate the sensitivity and the effectiveness of the proposed piezoceramic-based approach in the structural health monitoring of the concrete structure under earthquake loading. The relative paper of this research was awarded as the best paper prize in the 2008 ASCE Earth and Space Conference. |
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