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.
出处
《振动与冲击》
EI
CSCD
北大核心
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)
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
super-long-span suspension bridge
erection phase
flutter stability
stiffness reduction
damping ratio
cross cable
