Structural Deformation Measurement Using MATLAB Image Processing Toolbox

Year 2017, Volume: 1 Issue: 2, 30 - 37, 10.12.2017

Senem Bilici , Zeynep Fırat Alemdar

Abstract

This
paper describes the use of digital photogrammetry for measurement of
deflections in concrete beams during the bending test. This new method to
measure displacements in the experimental mechanics without applying digital
sensors to the specimens is described. The optical technique uses a camera, a
computer with frame grabber board and image analysis techniques within the
MATLAB Image Processing Toolbox. The displacements at the surface of the test
specimens are obtained by the analysis of the movements of dots painted on the
specimen. The image analysis algorithm makes it possible to automatically track
the motions of the dots and compute their centroid coordinates in a sequence of
images. The aim of the study is to examine the surface deformations of the
reinforced concrete under uniaxial loading and to compare with the results
obtained from traditional instruments. 

Keywords

bending test, deflection measurement, digital image processing

References

• Reference 1 Arslan G., Keskin R.S.O. & Öztürk M. 2017 Shear Behavior of Polypropylene Fiber-Reinforced Concrete Beams without Stirrups, Structures & Buildings, 170 (3), 190-198. Reference 2 Austrell P.E., Enquist B., Heyden A. & Spanne S. 1995 Contact Free Strain Measurement Using MATLAB Image Processing Toolbox, Nordic MATLAB Conference, Stockholm. Reference 3 Çomak B., Beycioğlu A., Başyiğit C. & Kılınçarslan Ş. 2011 The Use of Image Processing Techniques in Concrete Technology, International Advanced Technologies Symposium, Elazığ. Reference 4 Fırat Alemdar Z., Browning J. & Olafsen J. 2011 Photogrammetric Measurements of RC Bridge Column Deformations, Journal of Engineering Structures, 33 (8), 2407-2415. Reference 5 Jauregui D.V., Leitch K.R., White K.R. & Woodward C. 2002 Vertical Deflection Measurement of Bridge Structures with Digital Close-Range Terrestrial Photogrammetry, First International Conference on Bridge Maintenance, Safety and Management, Barcelona, Spain. Reference 6 Öztürk M. 2016 Shear Strength Of Polypropylene Fiber Reinforced Concrete Beams without Stirrups. MSc. thesis, Department of Civil Engineering, Graduate School Of Natural And Applied Sciences, Yıldız Technical University, Turkey. Reference 7 Pan B., Qian K., Xie H. & Asundi A. 2009 Two-Dimensional Digital Image Correlation for In-Plane Displacement and Strain Measurement, Measurement Science And Technology Conference, UK. Reference 8 Whiteman T., Lichti D.D. & Chandler I. 2002 Measurement of Deflections in Concrete Beams By Close-Range Digital Photogrammetry, Symposium on Geospatial Theory, Processing and Applications, Ottawa. Reference 9 Yue Z.Q., Chen S. & Tham L.G. 2003 Finite Element Modeling of Geomaterials Using Digital Image Processing. Computers and Geotechnics, 30, 375–397.