Computers and Concrete

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Structural health monitoring using piezoceramic transducers as strain gauges and acoustic emission sensors simultaneously

  • Huo, Linsheng (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Li, Xu (CITIC Construction CO., LTD) ;
  • Chen, Dongdong (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Li, Hongnan (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology)
  • Received : 2017.07.25
  • Accepted : 2017.08.19
  • Published : 2017.11.25
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Abstract

Piezoceramic transducers have been widely used in the health monitoring of civil structures. However, in most cases, they are used as sensors either to measure strain or receive stress waves. This paper proposes a method of using piezoelectric transducers as strain gauges and acoustic emission (AE) sensors simultaneously. The signals received by piezoceramic transducers are decomposed into different frequency components for various analysis purposes. The low-frequency signals are used to measure strain, whereas the high-frequency signals are used as acoustic emission signal associated with local damage. The b-value theory is used to process the AE signal in piezoceramic transducers. The proposed method was applied in the bending failure experiments of two reinforced concrete beams to verify its feasibility. The results showed that the extracted low-frequency signals from the piezoceramic transducers had good agreement with that from the strain gauge, and the processed high-frequency signal from piezoceramic transducers as AE could indicate the local damage to concrete. The experimental results verified the feasibly of structural health monitoring using piezoceramic transducers as strain gauges and AE sensors simultaneously, which can advance their application in civil engineering.

Keywords

Acknowledgement

Supported by : Natural Science Foundation of China, Central Universities

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