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Post-earthquake building safety evaluation using consumer-grade surveillance cameras

  • Hsu, Ting Y. (Department of Civil and Construction Engineering, National Taiwan University of Science and Technology) ;
  • Pham, Quang V. (Taiwan Building Technology Center, National Taiwan University of Science and Technology) ;
  • Chao, Wei C. (Taiwan Department of Civil Engineering, National Taipei University of Technology) ;
  • Yang, Yuan S. (Taiwan Department of Civil Engineering, National Taipei University of Technology)
  • Received : 2019.05.28
  • Accepted : 2019.12.27
  • Published : 2020.05.25
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Abstract

This paper demonstrates the possibility of evaluating the safety of a building right after an earthquake using consumer-grade surveillance cameras installed in the building. Two cameras are used in each story to extract the time history of interstory drift during the earthquake based on camera calibration, stereo triangulation, and image template matching techniques. The interstory drift of several markers on the rigid floor are used to estimate the motion of the geometric center using the least square approach, then the horizontal interstory drift of any location on the floor can be estimated. A shaking table collapse test of a steel building was conducted to verify the proposed approach. The results indicate that the accuracy of the interstory drift measured by the cameras is high enough to estimate the damage state of the building based on the fragility curve of the interstory drift ratio. On the other hand, the interstory drift measured by an accelerometer tends to underestimate the damage state when residual interstory drift occurs because the low frequency content of the displacement signal is eliminated when high-pass filtering is employed for baseline correction.

Keywords

Acknowledgement

The authors are grateful to the financial support from the Ministry of Science and Technology of Republic of China under Grant MOST106-2622-M-011-002-CC2. This work was also financially supported by the Taiwan Building Technology Center from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education in Taiwan.

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  1. A Stand-Alone Smart Camera System for Online Post-Earthquake Building Safety Assessment vol.20, pp.12, 2020, https://doi.org/10.3390/s20123374