An Investigation into the Acceleration Response of a Damaged Beam-Type Structure to a Moving Force

Title: An Investigation into the Acceleration Response of a Damaged Beam-Type Structure to a Moving Force
Authors: González, Arturo
Hester, David
Permanent link: http://hdl.handle.net/10197/6212
Date: Jun-2013
Abstract: In recent years there have been a growing number of publications on procedures for damage detection in beams from analysing their dynamic response to the passage of a moving force. Most of this research demonstrates their effectiveness by showing that a singularity that did not appear in the healthy structure is present in the response of the damaged structure. This paper elucidates from first principles how the acceleration response can be assumed to consist of 'static' and 'dynamic' components, and where the beam has experienced a localised loss in stiffness, an additional 'damage' component. The combination of these components establishes how the damage singularity will appear in the total response. For a given damage severity, the amplitude of the 'damage' component will depend on how close the damage location is to the sensor, and its frequency content will increase with higher velocities of the moving force. The latter has implications for damage detection because if the frequency content of the 'damage' component includes bridge and/or vehicle frequencies, it becomes more difficult to identify damage. The paper illustrates how a thorough understanding of the relationship between the 'static' and 'damage' components contributes to establish if damage has occurred and to provide an estimation of its location and severity. The findings are corroborated using accelerations from a planar finite element simulation model where the effects of force velocity and bridge span are examined.
Funding Details: European Commission - Seventh Framework Programme (FP7)
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2013 Elsevier
Keywords: Beam;Crack;Dynamic;Simply-supported;Singularities;Vibration
DOI: 10.1016/j.jsv.2013.01.024
Language: en
Status of Item: Peer reviewed
Appears in Collections:Civil Engineering Research Collection

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