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Framework of Nonlinear Dynamic Simulation of Long-Span Cable-Stayed Bridge and Traffic System Subjected to Cable-Loss Incidents
| 题名： | Framework of Nonlinear Dynamic Simulation of Long-Span Cable-Stayed Bridge and Traffic System Subjected to Cable-Loss Incidents |
| 正文语种： | 英文 |
| 作者： | Yufen Zhou, S.M.ASCE;Suren Chen, P.E., M.ASCE |
| 作者单位： | Colorado State Univ |
| 关键词： | Framework of Nonlinear Dynamic Simulation of Long-Span Cable-Stayed Bridge and Traffic System Subjected to Cable-Loss Incidents |
| 摘要： | 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 elemen-tal configuration and force condition during a general cable-loss in cident 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. DOI: 10.106l/(ASCE)ST.1943-541X.0001440.© 2015 American Society of Civil Engineers. |
| 出版日期： | 2016.03 |
| 出版年： | 2016 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | Vol.142 |
| 期： | NO.03 |
| 页码： | 04015160 |
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