Detection of Changes in Global Structural Stiffness Coefficients Using Acceleration Feedback
Publication: Journal of Engineering Mechanics
Volume 136, Issue 9
Abstract
This technical note presents an extension of a previous study where two methods for detecting structural damage have been developed by using displacement and velocity measurements. In this study, acceleration feedback is used in detecting changes in global structural stiffness coefficients of lumped-mass-shear-beam models. The previously developed method relies on the decoupling of effects of changes in stiffness at different locations and the use of displacement or velocity feedback has proven to be effective. Extension to the use of acceleration feedback using existing formulation is not trivial in that the desired decoupling effect cannot be achieved by simple coordinate transformation because the acceleration itself is directly related to the stiffness coefficients. An approach to circumvent this difficulty is presented and it involves increasing the order of time derivatives of the linear system so that the acceleration becomes the “velocity” of the new system. The performance of the proposed method is demonstrated using an illustrative example of a three-story model with stiffness changes at different floors. Numerical studies are also conducted to evaluate the time horizons required to normalize monitor outputs for the effective and efficient detection of stiffness changes.
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Acknowledgments
This study was sponsored by National Science Foundation Grant No. NSFCMS 0511046. The guidance of program director, Dr. S. C. Liu, is gratefully acknowledged.
References
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© 2010 ASCE.
History
Received: Oct 30, 2009
Accepted: Mar 9, 2010
Published online: Aug 13, 2010
Published in print: Sep 2010
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