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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第5期    总第61期    2014年10月

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文章编号:1672-7029(2014)05-0005-07
大跨径悬索桥施工阶段颤振稳定性影响因素研究
李春光1,2,刘书倩2,韩艳2,蔡春声2

(1. 同济大学 土木工程防灾国家重点实验室, 上海 200092;
2.长沙理工大学 桥梁工程安全控制技术与装备湖南省工程技术研究中心,湖南 长沙 410114
)

摘 要: 基于全物理坐标法的ANSYS有限元模型,对中渡桥施工阶段颤振稳定性进行分析,分别研究对称与不对称施工、不同初始风攻角、结构阻尼等因素对施工阶段颤振稳定性的影响。研究结果表明:不对称施工顺序更有利于施工阶段的颤振稳定性;初始风攻角为-3°时有利于颤振稳定性,而+3°时最为不利;结构阻尼对颤振稳定性影响较大,特别是早期施工阶段尤为显著,可明显改善大跨度悬索桥施工阶段颤振稳定性。分析方法可为桥梁设计和研究人员提供参考。

 

关键字: 大跨径悬索桥;颤振稳定性;施工阶段;ANSYS模型

Research on flutter stability of a long-span suspension bridge during erection
Chunguang1,2, LIU Shuqian2, HAN Yan2, CAI Chunsheng2

1.State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
2.School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha 410004, China

Abstract:The characteristics of flutter stability during construction are influenced by many factors such as the sequence of deck erection. In this paper, numerical flutter stability analyses were performed for the construction process of the Zhongdu Bridge over Yangtze River with ANSYS FE model based on physical coordinates method. Therein, the effect of structural damping, the initial wind attack angle, and the sequence of deck erection were discussed in detail. It is found that the non-symmetrical sequence deck erection is aerodynamically favourable for the deck erection for long-span suspension bridges. As for the initial wind attack angle, it is beneficial to flutter stability with -3°, while unfavorable with +3°. Meanwhile, structural damping has a great impact on flutter stability, particularly obvious during the early construction stage. This analysis method with ANSYS could afford reference to bridge designers.

 

Key words: long-span suspension bridge; flutter stability; construction phase; ANSYS model

ISSN 1672-7029
CN 43-1423/U

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