万米级跨度索网桥结构概念设计

Structural conceptual design of cable-network bridge with span of ten thousand meters

从概念设计出发,提出一种新型索网承重式桥梁,通过改变缆索体系,增加桥梁的总体刚度来提高超大跨度桥梁的气动稳定性.鉴于传统材料的强度重量比不足,采用新材料,设计了一座主跨为10km的索网桥,进行了全桥的静力分析,并进一步进行了影响索网桥性能的各个参数的参数设计,包括索网系统布置形式、不同主梁材料等.最后采用非线性有限元方法详细分析了索网桥桥梁的静风稳定性能,为超大跨径索网桥的静风稳定性设计提供依据与参考.计算结果表明,采用新的结构体系和CFRP材料,建造10km跨度的超大跨度桥梁在理论上是可行的,其静风稳定性亦能满足世界上绝大多数台风区的要求.

From the concept,a new kind of cable-supported bridge was put forward to increase the aerodynamic stability by changing the cable systems and increasing the total stiffness of the bridge.In view of the low ratio of the main cable's intensity to weight,a cable-network bridge with the span of 10 km was designed with new material.Then,static analysis was performed and the parameters affecting the performance of the cable-network bridge,such as cable system distribution,different materials and so on,were discussed.Finally,the nonlinear finite element method was used to study the influences of different parameters on the aerostatic stability of the cable-network bridge and the results can be used as references for aerostatic design of cable-network bridges.The analysis results indicate that a cable-network bridge with the span of 10 km with a new structural system and CFRP(carbon fiber reinforced polymer) is possible.In addition,the aerostatic stability can satisfy the requirement of most typhoon regions.