Probability of Overturning for Vehicles Moving on a Bridge Deck in a Wind Environment Considering Stochastic Process Characteristics of Excitations
Publication: Journal of Performance of Constructed Facilities
Volume 29, Issue 1
Abstract
Based on a wind-vehicle-bridge analysis system and quasi-steady pneumatic force coefficient data obtained from wind tunnel tests, the problem of moving vehicles on a cable-stayed bridge deck overturning in a strong wind environment is studied, with the probability evaluation as the emphasis. It is put forward that the evaluation of a vehicle’s overturning is a probability problem that a stochastic process overpasses a threshold level, and the influence of the statistic process characteristics of excitations on driving safety is profoundly discussed in the paper. The analysis shows that the higher the driving speed, the more obvious the effect of statistic process characteristics tends to be. Moreover, the influence degree of stochastic process characteristics is relevant to the wind velocity range of the dynamic reliability curve and the range of the probability distribution for the mean wind velocity. When the range of the former is broad enough and overlaps with the range of the latter, the influence of stochastic process characteristics should be considered. Wind barriers can promote a safe driving velocity from 80 to under normal weather conditions. Under extreme weather conditions, traffic control measures should be implemented to maintain the bridge’s traffic service. Wind barriers together with the speed limitation () can ensure that a truck passes the bridge safely during storm conditions (, Beaufort Scale 10). When the natural wind is a violent storm (, Beaufort Scale 11), the speed limitation should be .
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Acknowledgments
The writers are grateful for the financial support from the National Science Foundation of China (Nos. 51108154 and 51278064).
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Published In
Journal of Performance of Constructed Facilities
Volume 29 • Issue 1 • February 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 18, 2012
Accepted: May 30, 2013
Published online: Jun 3, 2013
Discussion open until: Nov 25, 2014
Published in print: Feb 1, 2015
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