缆拱桥的结构形式和性能

Structure and Performance of Cable-arch Bridge

提出了一种桥梁结构体系——缆拱桥,其结构的主要特征是缆索两端锚固于拱脚或其附近,荷载由拱肋与缆索共同承担.拱既是承重构件,又起到锚碇作用;缆既是承重构件,又起到系杆作用.给出了缆拱桥的具体结构形式,并对其结构强度、刚度、稳定特性及动力特性进行有限元分析.结果表明:与相同跨度及截面的系杆拱桥相比,缆拱桥的稳定承载力及强度承载力大幅提高,刚度略有下降.此外,缆拱桥造型美观,更容易做到力与美的统一,且其较高的稳定承载力和强度承载力为拱结构跨度提升提供了新的有效途径.

A bridge structure system,the cable-arch bridge,is presented in this paper. The main feature of the structure is that the cable is anchored on the arch foot or nearby and the load is borne by the arch and the cable. The arch is both load bearing and anchored,and the cable is both load bearing and tie bar.The structure of the bridge is given,and the structural strength,the stiffness,the stability and the dynamic characteristics of the bridge are analyzed by finite element method. The results show that the stability and the strength bearing capacity of the bridge are greatly improved and the rigidity is slightly decreased compared with the tied arch bridge with the same span and cross section. In addition,the cable-arch bridge is easier to achieve the unity of force and beauty,and its high stability provides a new effective way to improve the span of arch structure.