Computational Technology Resources - CCP

Keywords: digital image correlation method, healthy diagnosis of structures, dynamic digital image correlation method, real-time on-line monitoring of buildings.

Summary

As a result of its unique geological features, Taiwan suffers tremendous damage caused by earthquakes, and typhoons during the summer and fall. If the characteristics of buildings are well understood new technology can be implemented so that the damage caused by most natural disasters can be significantly alleviated. In this research, commercial digital cameras and computers are applied for the development of a low-cost digital image correlation coefficient method for deformation measurement. Our research team [1,2,3] has applied the digital image correlation (DIC) method for observing cracks developed in brick walls, microscopically observing metal anisotropic behavior, observing warp cracks developed in reinforced concrete, testing steel plate damage mechanically, studying cracks developed in brittle material, observing warp cracks developed in light aggregate concrete, and monitoring bridge deformation under traffic loads. It is a non-contact optical measurement system that can be used for conducting the measurement of movement without disturbing the object to be measured. In this research, the digital image analysis technology with the capability of re-constructing three-dimensional information, which is based on establishing the correlation coefficients of digital images, for analyzing the building vibrating mode, will be developed and verified. The test results reveal that the first mode shape of the test beam with and without defects can be easily detected by this proposed DIC method. The test curves, calculated based on the conditions for conducting the tests, are highly correlated to the theoretical variation curves. This method, which has been confirmed for the solution of the lens warp problem in this study, will allow the use of a single camera to conduct three-dimensional analysis. The laboratory study using a cantilever test object also confirms that the theoretical deformation curve calculated using the proposed DIC method is highly correlated with the laboratory results. This indicates that the accuracy of the proposed method is high enough to apply for the proposed method to achieve the object of real-time on-line monitoring of the structure.

References

1: M.H. Shih, S.H. Tung, W.P. Sung, "Development of Digital Image Correlation Method to Analyze Crack Variations of Masonry Wall", Sadhana Academy Proceedings in Engineering Sciences, 33(6), 767-779, 2008.
2: W.P. Sung, M.H. Shih, C.H. Sui, "Digital Image Correlation Technique versus Infinitely Small Element Technique for Crack Analysis of Pipe with Crevice", 2009 Sixth International Conference on Fuzzy Systems and Knowledge Discovery, IEEE Computer Society, Tianjin, China, August 13-16, 2009. doi:10.1109/FSKD.2009.419
3: J.C. Kuo, D. Chen, S.H. Tung, M.H. Shih, "Prediction of the orientation spread in an aluminum bi-crystal during plane strain compression using a DIC-based Taylor model", Computational Materials Science, 42(4), 564-569, 2008. doi:10.1016/j.commatsci.2007.09.004

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 93 PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: Paper 65 Using the Digital Image Correlation Technique to Measure the Mode Shape of a Cantilever Beam M.H. Shih¹, W.P. Sung² and S.H. Tung³ ¹Department of Civil Engineering, National Chi-Nan University, Nan-Tou, Taiwan ²Department of Landscape Architecture, National Chin-Yi University of Technology, Taichung, Taiwan ³Department of Civil and Environmental Engineering, National University of Kaohsiung, Taiwan doi:10.4203/ccp.93.65 purchase the full-text of this paper Full Bibliographic Reference for this paper M.H. Shih, W.P. Sung, S.H. Tung, "Using the Digital Image Correlation Technique to Measure the Mode Shape of a Cantilever Beam", in , (Editors), "Proceedings of the Tenth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 65, 2010. doi:10.4203/ccp.93.65 Keywords: digital image correlation method, healthy diagnosis of structures, dynamic digital image correlation method, real-time on-line monitoring of buildings. Summary As a result of its unique geological features, Taiwan suffers tremendous damage caused by earthquakes, and typhoons during the summer and fall. If the characteristics of buildings are well understood new technology can be implemented so that the damage caused by most natural disasters can be significantly alleviated. In this research, commercial digital cameras and computers are applied for the development of a low-cost digital image correlation coefficient method for deformation measurement. Our research team [1,2,3] has applied the digital image correlation (DIC) method for observing cracks developed in brick walls, microscopically observing metal anisotropic behavior, observing warp cracks developed in reinforced concrete, testing steel plate damage mechanically, studying cracks developed in brittle material, observing warp cracks developed in light aggregate concrete, and monitoring bridge deformation under traffic loads. It is a non-contact optical measurement system that can be used for conducting the measurement of movement without disturbing the object to be measured. In this research, the digital image analysis technology with the capability of re-constructing three-dimensional information, which is based on establishing the correlation coefficients of digital images, for analyzing the building vibrating mode, will be developed and verified. The test results reveal that the first mode shape of the test beam with and without defects can be easily detected by this proposed DIC method. The test curves, calculated based on the conditions for conducting the tests, are highly correlated to the theoretical variation curves. This method, which has been confirmed for the solution of the lens warp problem in this study, will allow the use of a single camera to conduct three-dimensional analysis. The laboratory study using a cantilever test object also confirms that the theoretical deformation curve calculated using the proposed DIC method is highly correlated with the laboratory results. This indicates that the accuracy of the proposed method is high enough to apply for the proposed method to achieve the object of real-time on-line monitoring of the structure. References 1 M.H. Shih, S.H. Tung, W.P. Sung, "Development of Digital Image Correlation Method to Analyze Crack Variations of Masonry Wall", Sadhana Academy Proceedings in Engineering Sciences, 33(6), 767-779, 2008. 2 W.P. Sung, M.H. Shih, C.H. Sui, "Digital Image Correlation Technique versus Infinitely Small Element Technique for Crack Analysis of Pipe with Crevice", 2009 Sixth International Conference on Fuzzy Systems and Knowledge Discovery, IEEE Computer Society, Tianjin, China, August 13-16, 2009. doi:10.1109/FSKD.2009.419 3 J.C. Kuo, D. Chen, S.H. Tung, M.H. Shih, "Prediction of the orientation spread in an aluminum bi-crystal during plane strain compression using a DIC-based Taylor model", Computational Materials Science, 42(4), 564-569, 2008. doi:10.1016/j.commatsci.2007.09.004 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £145 +P&P)
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