Framework of Nonlinear Dynamic Simulation of Long-Span Cable-Stayed Bridge and Traffic System Subjected to Cable-Loss Incidents
Publication: Journal of Structural Engineering
Volume 142, Issue 3
Abstract
Cable loss is a critical extreme event for cable-supported bridges, which sometimes governs the bridge design. Like most extreme events possibly occurring on long-span bridges, cable loss (breakage) may happen with service loads such as traffic and/or wind applied to the bridge simultaneously. Dynamic analysis incorporating critical interactions with realistic service loads as well as appropriate nonlinear effects becomes essential for predicting the time-progressive performance of the bridge following cable-loss incidents. Despite the recent progress on related topics, existing studies on long-span bridges often suffer from the lack of appropriate simulation tools to address the needs of both complex dynamic interactions and nonlinearities associated with cable-loss incidents at the same time. A finite-element (FE) based nonlinear dynamic simulation framework for long-span bridges is developed to simulate the cable-loss incidents of the coupled bridge–traffic–wind system. Different from most existing studies, firstly, such a simulation tool directly simulates the cable-breakage event by both applying the counteracting forces and also physically reducing the area of the failing cable within the total breakage duration. As a result, both the elemental configuration and force condition during a general cable-loss incident can be characterized more realistically than existing studies. Secondly, the fully-coupled interactions among the bridge structure, multiple-vehicle dynamic models, and wind excitation are simulated on the FE basis. Lastly, comprehensive considerations of both geometric and material nonlinearities originated from structure, aerodynamic loads, and cable-loss incidents are incorporated. A prototype long-span cable-stayed bridge is selected to demonstrate the investigation of single-cable loss incidents. A detailed parametric study is carried out to understand the mechanism of the cable-loss incidents as well the impacts on bridge response.
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Acknowledgments
It is gratefully acknowledged that this work is supported by the National Science Foundation Grant CMMI-1335571. The first author would also like to give sincere thanks to Prof. Yaojun Ge at Tongji University, for his valuable discussions and suggestions.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 9, 2014
Accepted: Sep 14, 2015
Published online: Nov 4, 2015
Published in print: Mar 1, 2016
Discussion open until: Apr 4, 2016
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