Impact Factors of Simply Supported Prestressed Concrete Girder Bridges due to Vehicle Braking
Publication: Journal of Bridge Engineering
Volume 20, Issue 11
Abstract
Much research has been conducted to study the dynamic impact of simply supported bridges due to vehicles moving at constant speeds, whereas only a few studies have focused on the impact due to vehicles changing speed on bridges. Previous numerical studies have shown that the impact factors due to vehicle braking may exceed those prescribed in the bridge design codes. However, most researchers adopted simple vehicle and bridge models that were not able to consider the spatial effect of real bridges and may have overestimated the actual impact factors due to vehicle braking. In this study, a three-dimensional vehicle–bridge coupled model was developed to study the dynamic impact factors of simply supported prestressed concrete girder bridges due to vehicle braking. Impact factors for different bridge responses were studied, including deflection, bending moment, and shear. The results showed that the impact factors due to vehicle braking could be notably larger than those due to the vehicles moving at constant speeds and could exceed the impact factor specified in the AASHTO bridge design code.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Grant No. 51208189 and No. 51478176) and Excellent Youth Foundation of Hunan Scientific Committee (Grant No. 14JJ1014).
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Information
Published In
Journal of Bridge Engineering
Volume 20 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Aug 11, 2014
Accepted: Dec 9, 2014
Published online: Apr 2, 2015
Discussion open until: Sep 2, 2015
Published in print: Nov 1, 2015
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