Smart Structures and Systems

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Vision-based multipoint measurement systems for structural in-plane and out-of-plane movements including twisting rotation

  • Lee, Jong-Han (Department of Civil Engineering, Daegu University) ;
  • Jung, Chi-Young (Seismic Simulation Test Center, Pusan National University) ;
  • Choi, Eunsoo (Department of Civil Engineering, Hongik University) ;
  • Cheung, Jin-Hwan (Department of Civil Engineering, Pusan National University)
  • Received : 2017.04.20
  • Accepted : 2017.08.09
  • Published : 2017.11.25
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Abstract

The safety of structures is closely associated with the structural out-of-plane behavior. In particular, long and slender beam structures have been increasingly used in the design and construction. Therefore, an evaluation of the lateral and torsional behavior of a structure is important for the safety of the structure during construction as well as under service conditions. The current contact measurement method using displacement meters cannot measure independent movements directly and also requires caution when installing the displacement meters. Therefore, in this study, a vision-based system was used to measure the in-plane and out-of-plane displacements of a structure. The image processing algorithm was based on reference objects, including multiple targets in Lab color space. The captured targets were synchronized using a load indicator connected wirelessly to a data logger system in the server. A laboratory beam test was carried out to compare the displacements and rotation obtained from the proposed vision-based measurement system with those from the current measurement method using string potentiometers. The test results showed that the proposed vision-based measurement system could be applied successfully and easily to evaluating both the in-plane and out-of-plane movements of a beam including twisting rotation.

Keywords

Acknowledgement

Supported by : Korea government and Korea Agency for Infrastructure Technology Advancement (KAIA)

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