超大跨径碳纤维主缆悬索桥施工阶段颤振稳定性研究

李永乐;侯光阳;李翠娟;强士中

振动与冲击 ›› 2012, Vol. 31 ›› Issue (21) : 15-21.

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (21) : 15-21.
论文

超大跨径碳纤维主缆悬索桥施工阶段颤振稳定性研究

  • 李永乐1,侯光阳1,2,李翠娟1,强士中1
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Flutter Stability of Super-Long-Span Suspension Bridge with CFRP Main Cables during Erection

  • LI Yongle1 ,HOU Guangyang1,2 ,LI Cuijuan1 ,Qiang Shizhong1
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摘要

为明确超大跨径碳纤维主缆悬索桥施工过程中的颤振稳定性,采用状态空间法,对主跨3500m碳纤维主缆悬索桥10个施工阶段的颤振稳定性进行了分析,分别讨论了加劲梁刚度折减、阻尼比等参数对施工阶段颤振稳定性的影响,并研究了交叉索对改善悬索桥施工阶段颤振稳定性的作用,研究表明,同时布置竖向交叉索和水平交叉索可大幅提高超大跨径悬索桥施工阶段的颤振稳定性。

Abstract

In order to determine the flutter stability of super-long-span suspension bridge with CFRP main cables during erection, 10 erection phases of a CFRP-cable suspension bridge with a main span of 3500m are analyzed by the state-space method to obtain the critical wind speed of flutter stability. The effect of stiffness reduction of stiffening girder and structural damping are discussed in detail. The effect of cross cables is also studied to improve flutter stability. It is shown that flutter stability of super-long-span suspension bridge in erection phase can be greatly improved by using both vertical and horizontal cross cables.

关键词

超大跨径悬索桥 / 施工阶段 / 颤振稳定性 / 刚度折减 / 阻尼比 / 交叉索

Key words

super-long-span suspension bridge / erection phase / flutter stability / stiffness reduction / damping ratio / cross cable

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李永乐;侯光阳;李翠娟;强士中. 超大跨径碳纤维主缆悬索桥施工阶段颤振稳定性研究[J]. 振动与冲击, 2012, 31(21): 15-21
LI Yongle;HOU Guangyang;;LI Cuijuan;Qiang Shizhong. Flutter Stability of Super-Long-Span Suspension Bridge with CFRP Main Cables during Erection[J]. Journal of Vibration and Shock, 2012, 31(21): 15-21

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