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20 April 2012 Evaluation of bridge span by recovered stiffness data obtained with moving vehicle loadings
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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.
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Chia-Chi Cheng, Chih-Peng Yu, Ying-Tzu Ke, and Keng-Tsang Hsu "Evaluation of bridge span by recovered stiffness data obtained with moving vehicle loadings", Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 83482A (20 April 2012);

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