Experimental Studies of Extracting Bridge Mode Shapes by Response of a Moving Vehicle
Publication: Journal of Bridge Engineering
Volume 28, Issue 11
Abstract
Bridge inspections performed by the response of the moving vehicle have been widely studied because of its mobility and efficiency, whereas mode shapes extracted by the moving vehicle have low order and limited accuracy in existing studies. In this study, experimental studies are conducted in which a stationary shaker is used to excite the steady-state-forced vibration of the bridge, and the bridge vibration is collected by an accelerometer installed on a moving vehicle. Accurate multiorder mode shapes are obtained by extracting the vehicle acceleration envelope. First, a theoretical derivation of the method is provided, and an extraction process for field tests is proposed. Then, a model test of a three-span continuous beam bridge and a field test of a two-span continuous girder bridge are conducted. To verify the accuracy of the mode shapes extracted by the moving vehicle, reference data are obtained by finite-element modal analysis and by using the hammer test. Through a difference analysis of accelerations between the parked vehicle and the bridge deck under the test vehicle, the ability of the designed test vehicle to collect bridge vibration in different frequency bands is evaluated. Finally, the first five mode shapes of the bridge model and the first six mode shapes of the field bridge are extracted by a moving test vehicle, and the effects of vehicle speed and excitation amplitude on mode shape extraction are analyzed. The results show that multiorder mode shapes can be accurately extracted by a moving test vehicle.
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Data Availability Statement
All data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research work was jointly supported by the National Natural Science Foundation of China (Grant Nos. 52250011 and 52078100) and the Fundamental Research Funds for the Central Universities (Grant Nos. DUT22ZD213 and DUT22QN235).
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Published In
Journal of Bridge Engineering
Volume 28 • Issue 11 • November 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Dec 23, 2022
Accepted: Jul 14, 2023
Published online: Aug 28, 2023
Published in print: Nov 1, 2023
Discussion open until: Jan 28, 2024
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