5000m级空间混合缆索悬索桥的构形研讨

Discussion on the Configuration of a Spatial Hybrid Cable Suspension Bridge with 5000m Span

本文针对5000m级超大跨径海峡悬索桥的设计,依据双曲抛物面的直纹曲面特性,提出双曲抛物面空间混合缆索悬索桥的新结构体系,改革传统平行缆索悬索桥结构,增加碳纤维双曲抛物面空间缆索网,平行钢丝缆索承担竖向荷载,双曲抛物面形碳纤维空间缆索提高海峡悬索桥的空间刚度,二组缆索混合使用,优势互补,协同工作。结合5000m海峡悬索桥的工程背景,开展双曲抛物面空间混合缆索悬索桥的构形研究,建立ANSYS有限元分析模型,进行结构内力及动力模态特性分析研究,研究表明:双曲抛物面空间混合缆索悬索桥具有良好的空间刚度及抗风稳定性,其扭转频率和扭弯频率比显著提高,大幅度提高了颤振临界风速,从根本上解决了5000m级大跨径海峡悬索桥抗风稳定性问题。

In this paper,aiming at the design of a 5000m super-long-span Strait suspension bridge,a new structure system of hyperbolic paraboloid spatial hybrid cable suspension bridge is proposed according to the ruled surface characteristics of hyperbolic paraboloid.The new structure system is a reformation of the traditional parallel steel cable suspension bridge.A carbon fiber hyperbolic paraboloid spatial cable network is added,and the parallel steel cables bear vertical loads.The hyperbolic paraboloid carbon fiber spatial cable improves the space stiffness of the Strait suspension bridge.Those two cable systems complement each other.Taking the engineering background of a 5000m span Strait Suspension Bridge as an example,the configuration study of the hyperbolic paraboloid spatial hybrid cable suspension bridge was carried out,the ANSYS finite element analysis model was established,and the structural stress and dynamic modal characteristics were analyzed and studied.The study shows that the hyperbolic paraboloid spatial hybrid cable suspension bridge has good spatial stiffness and wind resistance stability.The torsion frequency and ratio of torsion to bending frequency are significantly improved,and the critical wind speed of flutter is substantial improved.This new structure system solved wind stability problem of the 5000m super-long-span Strait suspension bridge.