缆索承重桥的体系比选

Comparison between structural systems in cable supported bridges

摘要:

从结构体系受力特点出发，将斜拉桥和悬索桥与其它各种双塔三跨缆索承重桥进行对比分析，并探讨在面对隧道竞争的情况下，不同跨径范围内结构体系的合理选择；最后比较了各种多塔缆索承重体系桥梁的力学与经济性能。分析表明，对于双塔三跨的缆索承重桥，主跨小于1100m时，优先选择斜拉桥体系；超过1100m时，悬索桥将面对其余缆索体系及隧道的竞争，可考虑锚碇和基础处水深及其它因素比较确定。

Abstract:

Based on the force characteristics of structural system, comparative analysis between cable stayed bridge, suspension bridge and other two-tower three-span cable supported bridges is carried out. Compared with tunnel the reasonable selection of structural system within different spans is discussed. Finally the mechanics and economic performances of multi-span cable supported bridge are compared. For two-tower three-span cable supported bridges the analysis indicates that cable stayed bridge should be adopted within 1100m main span preferentially. When span exceeds 1100m, suspension bridge is facing the competition from all the other cable supported bridges and tunnel. Suspension bridge can be adopted when the water depth of anchor, foundation and other factor are appropriate.