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Structural Monitoring and Maintenance
  Volume 6, Number 1, March 2019, pages 67-84
DOI: http://dx.doi.org/10.12989/smm.2019.6.1.067
 


QR code as speckle pattern for reinforced concrete beams using digital image correlation
B. Murali Krishna, T.P. Tezeswi, P. Rathish Kumar, K. Gopikrishna, M.V.N. Sivakumar and M. Shashi

 
Abstract
    Digital Image Correlation technique (DIC) is a non-contact optical method for rapid structural health monitoring of critical infrastructure. An innovative approach to DIC is presented using QR (Quick Response) code based random speckle pattern. Reinforced Cement Concrete (RCC) beams of size 1800 mm X 150 mm X 200 mm are tested in flexure. DIC is used to extract Moment (M) – Curvature (k) relationships using random speckle patterns and QR code based random speckle patterns. The QR code based random speckle pattern is evaluated for 2D DIC measurements and the QR code speckle pattern performs satisfactorily in comparison with random speckle pattern when considered in the context of serving a dual purpose. Characteristics of QR code based random speckle pattern are quantified and its applicability to DIC is explored. The ultimate moment-curvature values computed from the QR code based random speckled pattern are found to be in good agreement with conventional measurements. QR code encrypts the structural information which enables integration with building information modelling (BIM).
 
Key Words
    DIC; Speckle Pattern; QR Code; Moment-Curvature; Reinforced Cement Concrete (RCC)
 
Address
B. Murali Krishna, T.P. Tezeswi, P. Rathish Kumar, K. Gopikrishna, M.V.N. Sivakumar and M. Shashi: Department of Civil Engineering, National Institute of Technology Warangal, Telangana, India-506004
 

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