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Proceedings Paper

Evaluation of bridge span by recovered stiffness data obtained with moving vehicle loadings
Author(s): Chia-Chi Cheng; Chih-Peng Yu; Ying-Tzu Ke; Keng-Tsang Hsu
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Paper Abstract

The stiffness of a bridge span is evaluated by the dynamic displacement response corresponding to a three-axial vehicle load moving with constant speed. The dynamic displacement influence line obtained from the dynamic displacement time history was filtered by window smoothing and empirical modal decomposition (EMD) methods to acquire the quasi-static displacement influence line. The beam stiffness was obtained by dividing the moment diagram corresponding to a concentrated load applying on the measuring position with the curvature of the quasi-influence line. The effects of three-axial moving load, moving speeds, and measuring positions on the stiffness estimation are explored. The results show the window smoothing method is a better technique to obtain the quasi-static influence line. The only discrepancies in curvature for single and three-axial load cases are near both ends of the beam. A larger range of correct stiffness can be recovered for load moving with lower speed. Similar stiffness diagram can be obtained from the influence lines at different measuring positions.

Paper Details

Date Published: 20 April 2012
PDF: 7 pages
Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 83482A (20 April 2012); doi: 10.1117/12.915142
Show Author Affiliations
Chia-Chi Cheng, Chaoyang Univ. of Technology (Taiwan)
Chih-Peng Yu, Chaoyang Univ. of Technology (Taiwan)
Ying-Tzu Ke, Chaoyang Univ. of Technology (Taiwan)
Keng-Tsang Hsu, Chaoyang Univ. of Technology (Taiwan)


Published in SPIE Proceedings Vol. 8348:
Health Monitoring of Structural and Biological Systems 2012
Tribikram Kundu, Editor(s)

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