DOI QR코드

DOI QR Code

Locating cracks in RC structures using mode shape-based indices and proposed modifications

  • Fayyadh, Moatasem M. (Asset Lifecycle, Sydney Water) ;
  • Razak, Hashim Abdul (Department of Civil Engineering, University of Malaya)
  • 투고 : 2020.08.04
  • 심사 : 2022.01.05
  • 발행 : 2022.01.25

초록

This study presents the application of two indices for the locating of cracks in Reinforced Concrete (RC) structures, as well as the development of their modified forms to overcome limitations. The first index is based on mode shape curvature and the second index is based on the fourth derivative of the mode shape. In order to confirm the indices' effectiveness, both eigenvalues coupled with nonlinear static analyses were carried out and the eigenvectors for two different damage locations and intensities of load were obtained from the finite element model of RC beams. The values of the damage-locating indices derived using both indices were then compared. Generally, the mode shape curvature-based index suffered from insensitivity when attempting to detect the damage location; this also applied to the mode shape fourth derivative-based index at lower modes. However, at higher modes, the mode shape fourth derivative-based index gave an acceptable indication of the damage location. Both the indices showed inconsistencies and anomalies at the supports. This study proposed modification to both indices to overcome identified flaws. The results proved that modified forms exhibited better sensitivity for identifying the damage location. In addition, anomalies at the supports were eliminated.

키워드

과제정보

The authors would like to acknowledge the financial assistance provided by University of Malaya. The authors would also like to thank all the people who have contributed in any way to making this research possible.

참고문헌

  1. Abdul Razak, H. and Fayyadh, M.M. (2013), "Sensitivity of natural frequencies to composite effects in reinforced concrete elements", Mech. Adv. Mater. Struct., 20(6), 441-453. https://doi.org/10.1080/15376494.2011.627636.
  2. ACI 318-08 (2008), Building Code Requirements for Structural Concern, American Concrete Institute, Farmington Hills, MI, USA.
  3. Choi, F.C., Le, J., Samali, B. and Crews, K. (2008), "Application of the modified index method to timber beams", Eng. Struct., 30(4), 1124 -1145. https://doi.org/10.1016/j.engstruct.2007.07.014.
  4. Dutta, A. and Talukdar, S. (2004), "Damage detection in bridges using accurate modal parameters", Finite Elem. Anal. Des., 40(3), 287-304. https://doi.org/10.1016/S0168-874X(02)00227-5.
  5. Fayyadh, M.M. and Abdul Razak H. (2013), "Damage identification and assessment in RC structures using vibration data: a review", J. Civil Eng. Manage., 19(3), 375-386. https://doi.org/10.3846/13923730.2012.744773.
  6. Fayyadh, M.M. and Abdul Razak, H. (2011), "Detection of damage location using mode shape deviation: Numerical study", Int. J. Physic. Sci., 6(24), 5688-5698. https://doi.org/ 10.5897/IJPS11.971.
  7. Fayyadh, M.M. and Abdul Razak, H. (2012), "Condition assessment of elastic bearing supports using vibration data", Constr. Build. Mater., 30, 616-628. https://doi.org/10.1016/j.conbuildmat.2011.12.043.
  8. Fayyadh, M.M. and Abdul Razak, H. (2011), "Stiffness reduction index for detection of damage location: Analytical study", Int. J. Physic. Sci., 6(9), 2194-2204. https://doi.org/ 10.5897/IJPS11.378.
  9. Fayyadh, M.M., Abdul Razak, H. and Khaleel, O.R. (2011), "Differential effects of support conditions on dynamic parameters", Procedia Eng., 14,177-184. https://doi.org/10.1016/j.proeng.2011.07.021.
  10. Fayyadh, M.M. and Abdul Razak, H. (2011), "Weighting method for modal parameter based damage detection algorithms", Int. J. Physic. Sci., 6(20), 4816-4825. https://doi.org/ 10.5897/IJPS11.929.
  11. Frans, R., Arfiadi, Y. and Parung, H. (2017), "Comparative study of mode shapes curvature and damage locating vector methods for damage detection of structures", Procedia Eng., 171, 1263-1271. https://doi.org/10.1016/j.proeng.2017.01.420.
  12. Ismail, Z. and Abdul Razak, H. (2006), "Determination of damage location in R.C. beams using mode shape derivatives", Eng. Struct., 28(11), 1566 -1573. https://doi.org/10.1016/j.engstruct.2006.02.010.
  13. Pandey, A.K., Biswas, M. and Samman, M.M. (1991), "Damage detection from change in curvature mode shapes", J. Sound Vib., 145(2), 321-332. https://doi.org/10.1016/0022-460X(91)90595-B.
  14. Fayyadh, M.M. and Abdul Razak, H. (2011), "Modified damage location indices in beam-like structure: Analytical study", Sci. Res. Essays, 6(32), 6605-6621.
  15. Pholdee, N. and Bureerat, S. (2016), "Structural health monitoring through meta-heuristics - comparative performance study", Adv. Comput. Des., 1(4), 315-327. http://dx.doi.org/10.12989/acd.2016.1.4.315.
  16. Ratcliffe, C.P. (1997), "Damage detection using a modified Laplacian operator on mode shape data", J. Sound Vib., 204(3), 505-517. https://doi.org/10.1006/jsvi.1997.0961.
  17. Shokrani, Y., Dertimanis, V.K., Chatzi, E.N. and Savoia, M.N. (2018), "On the use of mode shape curvature for damage localization under varying environmental conditions", Struct. Health Monitor., 25(4), e2132. https://doi.org/10.1002/stc.2132.
  18. Stubbs, N., Kim J.T. and Farrar C.R. (1995), "Field verification of non-destructive damage localization and severity estimation algorithm", Processing of the 13th international modal analysis conference, Tennessee, USA, February.
  19. Wahab, M.M.A. and De Roeck G. (1999), "Damage detection in bridges using modal curvature: application to a real damage scenario", J. Sound Vib., 226(2), 217-235. https://doi.org/10.1006/jsvi.1999.2295.