Experimental and Numerical Studies of Nonstationary Random Vibrations for a High-Pier Bridge under Vehicular Loads
Publication: Journal of Bridge Engineering
Volume 18, Issue 10
Abstract
In the current study, the nonstationary random responses of moving wheels induced by road roughness in a time domain were obtained and treated as the nonstationary inputs to study the nonstationary vibration of a high-pier bridge under vehicles with variable speed. A full-scale vehicle model with 12 degrees of freedom was used; vehicle wheels were considered as patch contact instead of point contact with the bridge road surface. The vehicle-bridge coupling equations were established by combining the equations of motion of both the bridge and vehicle using the displacement relationship and the interaction force relationship at the contact patches. The midspan deflections caused by the stationary and nonstationary inputs were compared with the measured responses under different parameters including vehicle acceleration and vehicle deceleration. The verified results showed that the proposed method can accurately simulate the vibration of the bridge under vehicles moving with variable speeds. Using the stationary random process to model the road surface disturbance to vehicles with variable speeds, the dynamic effects can be either underestimated or overestimated. The proposed method was then used to study the ride comfort for vehicles moving with a variable speed on high-pier bridges.
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Acknowledgments
The authors acknowledge the financial support provided by the Natural Science Foundation China (Project Nos. 51108045, 51178066, and 50908025) and the Scientific Research Fund of Hunan Provincial Education Department of China (Project No. 430S00004/11C0058).
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 18 • Issue 10 • October 2013
Pages: 1005 - 1020
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 11, 2012
Accepted: Aug 22, 2012
Published online: Sep 1, 2012
Published in print: Oct 1, 2013
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