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Type: Journal article
Title: Modal identification of a suspension footbridge using free vibration signatures
Author: Au, S.
Ng, C.
Sien, H.
Chua, H.
Citation: International Journal of Applied Mathematics and Mechanics, 2005; 1(4):55-73
Publisher: GBS Publishers & Distributors
Issue Date: 2005
ISSN: 0973-0184
Statement of
S.K. Au, C.T. Ng, H.W. Sien, and H.Y. Chua
Abstract: The dynamic characteristics of a suspension footbridge are investigated through modal identification. Despite its appearance, the dynamic characteristics of the footbridge are atypical of suspension bridges. Human excitation was used to provide initial conditions of sufficient amplitude for generating free vibration signatures during testing. A conventional modal identification method based on least-square minimization of the discrepancy between the measured and model response is adopted for identifying the modal characteristics. The method has been augmented to allow multiple data sets to be incorporated in the identification of modal parameters. This capability is called for by the available data sets. The results show that the suspension footbridge behaves predominantly as a beam rather than as a typical suspension bridge, although the suspension hangers do contribute to stiffening of the bridge.
Keywords: Free vibration test
Tanjong Rhu suspension bridge
structural identification
Rights: Copyright status unknown
Appears in Collections:Aurora harvest
Civil and Environmental Engineering publications

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