Damage Detection in Beam-Like Structures Using Deflections Obtained by Modal Flexibility Matrices

Abstract:

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In bridge structures, damage may induce an additional deflection which may naturally contain essential information about the damage. However, inverse mapping from the damage-induced deflection to the actual damage location and severity is generally complex, particularly for statically indeterminate systems. In this paper, a new load concept, called the positive-bending-inspection-load (PBIL) is proposed to construct a simple inverse mapping from the damage-induced deflection to the actual damage location. A PBIL for an inspection region is defined as a load or a system of load which guarantees bending moment to be positive in the inspection region. From the theoretical investigations, it was proven that the damage-induced chord-wise deflection (DI-CD) has the maximum value with the abrupt change in its slope at the damage location under a PBIL. Hence, a novel damage localization method is proposed based on the DI-CD under a PBIL. Experimental verification study was also carried out on a two-span continuous steel box-girder model with a steel box-girder. It was found that the proposed method clearly identified the damage existence and damage location for small damage cases with narrow cuts at the bottom flange.

Info:

Periodical:

Edited by:

Pietro VINCENZINI and Fabio CASCIATI

Pages:

483-488

DOI:

10.4028/www.scientific.net/AST.56.483

Citation:

K. Y. Koo et al., "Damage Detection in Beam-Like Structures Using Deflections Obtained by Modal Flexibility Matrices ", Advances in Science and Technology, Vol. 56, pp. 483-488, 2008

Online since:

September 2008

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Price:

$35.00

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