Smart Structures and Systems

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Distributed crack sensors featuring unique memory capability for post-earthquake condition assessment of RC structures

  • Chen, Genda (Department of Civil, Architectural & Environmental Engineering, University of Missouri-Rolla) ;
  • McDaniel, Ryan (Department of Civil, Architectural & Environmental Engineering, University of Missouri-Rolla) ;
  • Sun, Shishuang (Department of Electrical and Computer Engineering, University of Missouri-Rolla) ;
  • Pommerenke, David (Department of Electrical and Computer Engineering, University of Missouri-Rolla) ;
  • Drewniak, James (Department of Electrical and Computer Engineering, University of Missouri-Rolla)
  • Received : 2004.04.08
  • Accepted : 2005.03.24
  • Published : 2005.04.25
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Abstract

A new design of distributed crack sensors based on the topological change of transmission line cables is presented for the condition assessment of reinforced concrete (RC) structures during and immediately after an earthquake event. This study is primarily focused on the performance of cable sensors under dynamic loading, particularly a feature that allows for some "memory" of the crack history of an RC member. This feature enables the post-earthquake condition assessment of structural members such as RC columns, in which the earthquake-induced cracks are closed immediately after an earthquake event due to gravity loads, and are visually undetectable. Factors affecting the onset of the feature were investigated experimentally with small-scale RC beams under cyclic loading. Test results indicated that both crack width and the number of loading cycles were instrumental in the onset of the memory feature of cable sensors. Practical issues related to dynamic acquisition with the sensors are discussed. The sensors were proven to be fatigue resistant from shake table tests of RC columns. The sensors continued to show useful performance after the columns can no longer support additional loads.

Keywords

References

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Cited by

  1. Development of a Distributed Crack Sensor Using Coaxial Cable vol.16, pp.12, 2016, https://doi.org/10.3390/s16081198
  2. Crack Detectability and Durability of Coaxial Cable Sensors in Reinforced Concrete Bridge Applications vol.2172, pp.1, 2010, https://doi.org/10.3141/2172-17
  3. Fabrication and packaging techniques for the application of MEMS strain sensors to wireless crack monitoring in ageing civil infrastructures vol.6, pp.3, 2005, https://doi.org/10.12989/sss.2010.6.3.225