Damage Detection of a Prestressed Concrete Beam Using Modal Strains
Publication: Journal of Structural Engineering
Volume 131, Issue 9
Abstract
Different methods are proposed in literature using experimental modal information to detect possible damage. In this paper a finite-element (FE) model updating technique is applied. The unknown properties of a FE model are adapted, such that the differences between experimental modal data (modal curvature in combination with eigenfrequencies and mode shapes) and the corresponding analytical predictions are minimized. An iterative sensitivity based algorithm is used for solving this optimization problem. The method is applied to the damage assessment of a gradually damaged prestressed concrete beam. It is assumed, that damage can be characterized by reducing the bending stiffness. The main focus of this paper is to analyze the influence of using modal curvatures. In contrast to eigenfrequencies and mode shapes, modal curvatures are very sensitive to local changes of the bending stiffness nearby the sensor location, but insensitive to local changes far from the measurement location.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 131 • Issue 9 • September 2005
Pages: 1456 - 1463
Copyright
© 2005 ASCE.
History
Received: Dec 3, 2003
Accepted: Nov 29, 2004
Published online: Sep 1, 2005
Published in print: Sep 2005
Notes
Note. Associate Editor: Barry Thomas Rosson
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