System Identification and Damage Detection of a Prestressed Concrete Beam
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VIEW THE REPLYPublication: Journal of Structural Engineering
Volume 132, Issue 11
Abstract
In the domain of civil engineering it is often necessary to monitor constructions such as buildings or bridges to maintain safety conditions. Nondestructive test methods outmatch other methods, because they do not influence the constructions performance. One approach is based on the experimental determination of modal parameters (eigenvalues, damping, mode shapes). From the changes in modal data damage can be detected. By updating a reference finite-element model such that its numerical modal data correspond well with the experimental modal data of the damaged structure, the damage pattern can be identified. When applying this technique to prestressed concrete, the problem arises that, because of the prestressing, cracks close again. Therefore a research program was started to investigate the change of modal parameters of a gradually damaged prestressed concrete beam. Static loads with increasing amplitude were applied. In between each load step a dynamic measurement was performed. The results show that the damage detection remains difficult for prestressed concrete in the early damage state. However, a damage pattern could be identified, which corresponds to the locations of the final failure.
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Acknowledgments
The beam tests are carried out in the Laboratory Magnel of the University of Ghent within the framework of Project No. UNSPECIFIEDG.0266.01, supported by the National Fund for Scientific Research (FWO—Flanders). A. Teughels is research assistant of the FWO—Flanders.
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© 2006 ASCE.
History
Received: Mar 19, 2003
Accepted: Dec 22, 2005
Published online: Nov 1, 2006
Published in print: Nov 2006
Notes
Note. Associate Editor: Ahmet Emin Aktan
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