超大跨径碳纤维主缆悬索桥施工阶段颤振稳定性研究  

Flutter stability of a super-long-span suspension bridge with CFRP main cables during erection

作　　者：李永乐[1] 侯光阳[1,2] 李翠娟[1] 强士中[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]浙江省交通规划设计研究院,杭州310006

出　　处：《振动与冲击》2012年第21期15-21,共7页Journal of Vibration and Shock

基　　金：国家863计划资助项目(2008AA11Z101);国家科技支撑计划课题(2012BAG05B02);中央高校基本科研业务费专项资金资助(SWJTU11CX008;SWJTU11CX127)

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3 500 m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。In order to determine the flutter stability of a 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 were analyzed with the state-space method to obtain the critical wind speed of the flutter stability. The effect of stiffness reduction of stiffening girder and structural damping were discussed in detail. The effect of cross cables was also studied to improve the flutter stability. It was shown that the flutter stability of a 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 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]