摘要
研究目的:本文针对5000 m级超大跨径海峡悬索桥的需求,依据二次直纹曲面方程,提出单叶双曲面混合空间缆索悬索桥和双曲抛物面混合空间缆索悬索桥两种新桥型,开展空间混合缆索悬索桥的几何构形研究,建立ANSYS有限元分析模型,研讨空间缆索悬索桥的动力模态特性,探索空间缆索悬索桥结构的技术优势,解决超大跨径悬索桥颤振抗风稳定性的技术难题,为将来建造5000 m级超大跨径海峡悬索桥提供参考。研究结论:(1)混合空间缆索悬索桥中的钢丝缆索和碳纤维空间缆索协同工作,其扭转振型比平行悬索桥出现得晚得多,扭转频率和扭弯频率比有很大的提高,颤振临界风速有很大的提高;(2)平行悬索桥、单叶双曲面空间缆索悬索桥和双曲抛物面空间缆索悬索桥的第一阶正对称扭转频率分别为0.07988 Hz、0.19840 Hz和0.15578 Hz,扭弯比分别为1.22、2.88和2.35,颤振临界风速分别为:Vcr^p=20.83 m/s、Vcr^d=91.21 m/s、Vcr^s=71.18 m/s;(3)两种空间混合缆索结构体系具有良好的抗风稳定性,可为将来建造5000 m级超大跨径悬索桥开辟一条新的思路。
Research purposes:This paper aims at the needs of 5,000 m super-long-span strait suspension bridge.According to the equation of quadric ruled surface,two new bridge types of univalent hyperboloid mixed spatial cable suspension bridge and hyperbolic parabolic mixed spatial cable suspension bridge are proposed.In this paper,the geometric configuration of spatial mixed cable suspension bridges was studied,and the ANSYS finite element analysis model was established to study the dynamic modal characteristics of spatial cable suspension bridges.In addition,this paper explored the technical advantages of the spatial cable suspension bridge structure,and solved the technical problems of the flutter stability of super-long-span suspension bridges,to provide a reference for the future construction of 5,000 m super-long-span strait suspension bridges.Research conclusions:(1)The steel wire cables and the carbon fiber spatial cables in spatial mixed cable suspension bridges work together well,so the torsional mode appears much later than the parallel suspension bridge’s.The torsion frequency,the torsion-bending ratio and the flutter critical wind speed are all greatly improved.(2)The first-order positive symmetric torsion frequencies of the parallel suspension bridge,the univalent hyperboloid spatial cable suspension bridge and the hyperbolic parabolic spatial cable suspension bridge are:0.07988 Hz,0.19840 Hz and0.15578 Hz respectively.The torsion-bending ratios of the three are:1.22,2.88 and 2.35 respectively,and the critical flutter wind speeds are:Vcr^p=20.83 m/s,Vcr^d=91.21 m/s and Vcr^s=71.18 m/s respectively.(3)The two kinds of spatial mixed cable structure systems have good wind resistance and stability,which opens up the new train of thought for the future construction of 5,000 m super-long-span suspension bridges.
作者
徐文平
陈凯
秦韬睿
袁吉汗
XU Wenping;CHEN Kai;QIN Taorui;YUAN Jihan(Southeast University,Nanjing,Jiangsu 210096,China;Tus-Design Group Co.Ltd,Suzhou,Jiangsu 215021,China)
出处
《铁道工程学报》
EI
北大核心
2020年第11期49-55,共7页
Journal of Railway Engineering Society
基金
江苏省自然科学基金(BK2012755)。
关键词
超大跨径悬索桥
空间混合缆索
直纹曲面
动力模态特性
抗风稳定性
super-long-span suspension bridge
spatial mixed cable
ruled surface
dynamic modal characteristics
wind stability
