Laboratory study on the identification of moving vehicle axle loads on a multi-span continuous bridge from the measured bending moment responses is presented. A bridge-vehicle system model was fabricated in the laboratory. The bridge was modeled as a three span continuous beam and the car was modeled as a vehicle model with two-axle loads. A number of strain gauges were adhered to the bottom surface of the beam to measure the bending moment responses. Using measured bending moment responses as an input, the corresponding inverse problem was solved to identify moving loads. The moving forces were identified when considering bending moment responses from all spans of the beam. In order to avoid the lower identification accuracy around the inner supports of continuous bridge and to improve the computation efficiency, the moving force identification from the target (one selected) span of the continuous bridge was studied. The rebuilt responses were reconstructed from the identified loads as a forward problem. To study the accuracy of the method the relative percentage errors were calculated with respect to the measured and the rebuilt bending moment responses. The rebuilt bending moment responses obtained from the identified forces are in good agreement with the measured bending moment responses. This indirectly shows that the method is capable of identifying moving loads on continuous supported bridges.
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August 2006
Technical Papers
Moving Axle Load From Multi-Span Continuous Bridge: Laboratory Study
Tommy H.T. Chan,
Tommy H.T. Chan
Associate Professor
Department of Civil and Structural Engineering,
e-mail: cetommy@polyu.edu.hk
The Hong Kong Polytechnic University
, Hung Hom, Kowloon, Hong Kong, P. R. C.
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Demeke B. Ashebo
Demeke B. Ashebo
Department of Civil and Structural Engineering,
The Hong Kong Polytechnic University
, Hung Hom, Kowloon, Hong Kong, P. R. C.
Search for other works by this author on:
Tommy H.T. Chan
Associate Professor
Department of Civil and Structural Engineering,
The Hong Kong Polytechnic University
, Hung Hom, Kowloon, Hong Kong, P. R. C.e-mail: cetommy@polyu.edu.hk
Demeke B. Ashebo
Department of Civil and Structural Engineering,
The Hong Kong Polytechnic University
, Hung Hom, Kowloon, Hong Kong, P. R. C.J. Vib. Acoust. Aug 2006, 128(4): 521-526 (6 pages)
Published Online: February 12, 2006
Article history
Received:
September 10, 2004
Revised:
February 12, 2006
Citation
Chan, T. H., and Ashebo, D. B. (February 12, 2006). "Moving Axle Load From Multi-Span Continuous Bridge: Laboratory Study." ASME. J. Vib. Acoust. August 2006; 128(4): 521–526. https://doi.org/10.1115/1.2202154
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