Health Assessment at Local Level with Unknown Input Excitation
Publication: Journal of Structural Engineering
Volume 131, Issue 6
Abstract
A finite-element-based procedure is proposed to identify defects in existing structures and evaluate their extent at the local element level for the purpose of health assessment. The procedure is a time-domain system identification technique where input excitation is not required to identify a structure. It estimates the dynamic properties of a structure in terms of stiffness and damping at the element level in a finite-element representation. The method can be used to precisely locate a defective spot in an element. Although input excitation information is not required, examples are used to show that the algorithm is robust enough to identify a structure excited by different types of loading. Structures can be excited simultaneously by multiple loadings, and the response information can be noise-free or noise-contaminated. Defects can be small or relatively large. In all cases, the algorithm identified the structures correctly. The error in the identification is considerably smaller than that of other available methods where input excitation information is used to identify a structure. With the help of examples, it is shown that the algorithm can potentially be used as a nondestructive evaluation technique for health assessment of existing structures with minimum disruption of operations. Since the procedure is very simple and requires only a few seconds of response information, it is expected to be very economical and efficient.
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Acknowledgments
This paper is based on work partly supported by University of Arizona Foundation under a small grant program. Any opinions, findings, conclusions, or recommendations expressed in this paper are those of the writers and do not necessarily reflect the views of the sponsor.
References
ANSYS version 5.7 (2001), The Engineering Solutions Company, Canonsburg, PA.
Clough, R. W., and Penzien, J. (1993). Dynamics of structures, 2nd Ed., McGraw-Hill, New York.
Cook, R. D., Malkus, D. S., and Plesha, M. E. (1989). Concepts and applications of finite element analysis. 3rd Ed., Wiley, New York.
Doebling, S., Farrar, C., Prime, M., and Shevitz, D. (1996). “Damage Identification and Health Monitoring of Structural and Mechanical Systems from Changes in Their Variation Characteristics: A Literature Review.” Rep. No. LA-13070-MS, Los Alamos National Laboratory, Los Alamos, N.M.
Haldar, A., Ling, X., and Vo, P. H. (2000). “Element level damage evaluation using SI.” Proc., 8th Int. Conf. of Applications and Statistics and Probability (ICASP8-2000), A. A. Balkema Rotterddam, The Netherlands, 1143–1148.
Haldar, A., Ling, X., and Wang, D. (1998). “Use of SI for damage evaluation at the element level.” Structural Engineering World Wide, Paper Ref. T216-1 (CD-Rom).
Hoshiya, M., and Maruyama, O. (1987). “Identification of running load and beam system.” J. Eng. Mech., ASCE, 113(4), 813–824.
Housner, G., et al. (1997). “Structural control: Past, present and future.” J. Eng. Mech., 123(9), 897–971.
Katkhuda, H., Martinez, R. F., and Haldar, A. (2003). “Stiffness identification under uncertain blast loading.” Proc., 4th Int. Symp. on Uncertainty Modeling and Analysis, University of Maryland, College Park, Md., 22–27.
Koh, C., Hong, B., and Liaw, C. (2000). “Parameter identification of large structural systems in time domain.” J. Struct. Eng., 126(8), 957–963.
Lam, H., Katafygiotis, S., and Mickleborough, N. (2004). “Application of a statistical model updating approach on phase I of the IASC-ASCE structural health monitoring benchmark study.” J. Eng. Mech., 130(1), 34–48.
Ling, X. (2000). “Linear and nonlinear time domain system identification at element level for structural systems with unknown excitation.” Rep. No. CEEM-001-101, Dept. of Civil Engineering and Engineering Mechanics, Univ. of Arizona, Tucson, Ariz.
Ling, X., and Haldar, A. (2004). “Element level system identification with unknown input with Rayleigh damping.” J. Eng. Mech., 130(8), 877–885.
Toki, K., Sato, T., and Kiyono, J. (1989). “Identification of structural parameters and input ground motion from response time histories.” Struct. Eng./Earthquake Eng., 6(2), 413–421.
Vo, P. (2003). “Experimental study of the time domain damage identification.” Rep. No. CEEM-03-001 Dept. of Civil Engineering and Engineering Mechanics, Univ. of Arizona, Tucson, Ariz.
Vo, P., and Haldar, A. (2004). “Health assessment of beams—experimental investigation.” J. Struct. Eng., Structural Engineering Research Centre, Chennai, India, 31(1), 23–30.
Wang, D. (1995). “An element level time domain system identification technique with unknown input information.” Rep. No. CEEM-95-106, Univ. of Arizona, Tucson, Ariz.
Wang, D., and Haldar, A. (1994). “Element-level system identification with unknown input information.” J. Eng. Mech., 120(1), 159–176.
Yuen, K., Au, S., and Beck, J. (2004). “Two-stage structural health monitoring approach for phase I benchmark studies.” J. Eng. Mech., 130(1), 16–33.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 131 • Issue 6 • June 2005
Pages: 956 - 965
Copyright
© 2005 ASCE.
History
Received: Nov 11, 2003
Accepted: Oct 11, 2004
Published online: Jun 1, 2005
Published in print: Jun 2005
Notes
Note. Associate Editor: Sashi K. Kunnath
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