单主缆悬索桥A形桥塔创新设计

柳州双拥大桥为国内首座大跨地锚式单主缆悬索桥，创新性地采用了独特的非相似等腰三角形截面所形成的A形钢塔。对该桥塔结构构造和受力行为进行的系统研究表明：该桥塔结构形式的景观效果和受力性能良好；塔底采用承压板-拉杆形式的钢混连接结构具有受力明确、施工便利的优点，塔顶需重点解决不同于双缆悬索桥的索鞍巨大竖向力向2个塔柱有效传递的构造问题。

Innovative Design of A-Shaped Pylon for Single Main Cable Suspension Bridge

Liuzhou Shuangyong Bridge is the first long-span ground-anchored single main cable suspension bridge in China. The A-shaped steel pylon formed by a unique non-similar isosceles triangular section is innovatively used for this bridge. The structure and mechanical performances of this pylon are systematically studied. The study results show that the structural form of the bridge pylon has the good landscape effect and mechanical performance. The steel-concrete connection structure in the form of bearing plates and tie rods at the bottom of the pylon has the advantages of clear force and convenient construction. The top of the pylon needs to focus on solving the structural problem of effectively transmitting the huge vertical force of the cable saddle to the two pylons, which is different from the double-cable suspension bridge.