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中文摘要：
从结构体系受力特点出发，将斜拉桥和悬索桥与其他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；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他因素比较确定．
英文摘要：
Based on the force characteristics of structural system, a comparative analysis is made of the cable stayed bridge, suspension bridge and two-tower three-span cable supported bridges. In the face of the competition from tunnels, a reasonable selection of structural system within different spans is discussed. Finally, the mechanics and economic performances of multi-span cable supported bridges are compared. For two-tower three-span cable supported bridges, the analysis indicates that cable stayed bridge should be adopted within 1 100 m main span preferentially. When the span exceeds 1 100 m, the suspension bridge is facing the competition from both the cable supported bridges and tunnels. Suspension bridges can be adopted when the water depth of anchor, foundation and other factor are appropriate.
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