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NIA Seminar by M.P. Singh |
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Date: Wednesday, June 27, 2007
Time: 10:30am
Location: NIA, Room 137
Additional Information: Presentation (.pdf)
Curvature Flexibilities for Structural Damage Localization and Quantification
Prof. Mahendra P. Singh, Virginia Tech
Modal parameter-based damage detection and quantification approaches have been of continued interest in structural health monitoring of engineering structures. The methods that utilize flexibility matrix to identify the damage are preferred over the stiffness matrix-based approach simply because the flexibility matrix can be more accurately calculated than the stiffness matrix by using just a few modes. The flexibility based approach, however, can be further improved if element-specific curvature flexibilities are utilized instead of the displacement flexibilities. An approach to define the curvature flexibilities and how they can be used for damage localization and quantification will be presented. Since curvature flexibilities are associated with rotational degrees of freedom which are usually condensed out from a dynamic analysis model and are not measured, an iterative approach is necessary to recover this information. Numerical examples of beams and also a moment resistant frame where it becomes necessary to use the iterative approach are used to demonstrate the approach.
Prof. M. P. Singh is Preston Wade Professor in the Department of Engineering Science and Mechanics at Virginia Tech, where he has taught for last 30 years. His current research interests are in the areas of structural health monitoring, random vibrations, structural reliability, structural dynamics and control, and earthquake engineering. He has taught several graduate and undergraduate courses in these areas, and published more than 200 papers in archival journals and in conference proceedings.
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