Dynamic Analysis of a Cable-Stayed Concrete-Filled Steel Tube Arch Bridge under Vehicle Loading
Publication: Journal of Bridge Engineering
Volume 20, Issue 5
Abstract
This paper presents the results from a dynamic analysis of a cable-stayed concrete-filled steel tube arch bridge under vehicle loading. The study is carried out based on a three-dimensional vehicle-bridge coupled model. A finite-element model for the bridge is first developed and validated based on field measurement data. A truck specified by industry standards is adopted for vehicle loading in the analysis and is simulated as a multidegree-of-freedom vehicle model. Three important indexes, including the dynamic impact factor, perceptible level of vibration, and ride comfort of the bridge, are investigated. A parametric study is conducted to investigate the effects of a few important parameters, including the vehicle loading condition, vehicle speed, and road surface condition, on the three indexes. Results from the analysis show the following: (1) the dynamic impact factors, which vary between different bridge components/locations, are significantly affected by the three parameters; the impact factors of key structural components of the bridge studied are generally below the value of 0.33 specified in previous design specifications; (2) the perceptible level of bridge vibration is greatly affected by the road surface condition and vehicle loading condition; pedestrians can feel it to be slightly hard to walk on the bridge when two trucks move side by side under poor road surface conditions; and (3) the ride comfort of the bridge decreases as the road surface condition becomes worse, and drivers can feel a little uncomfortable under poor road surface conditions. Because all three indexes studied are found to be greatly affected by the road surface condition, establishing and maintaining a regular program of maintenance is very important to assure both the safety and serviceability of the bridge studied.
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Acknowledgments
The authors acknowledge financial support provided by the National Natural Science Foundation of China (Grant No. 51208189) and Excellent Youth Foundation of Hunan Scientific Committee (Grant No. 14JJ1014).
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© 2014 American Society of Civil Engineers.
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Received: Mar 18, 2014
Accepted: Jul 7, 2014
Published online: Jul 31, 2014
Published in print: May 1, 2015
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