三山桥自锚上承式拱结构设计

Design of Self-anchored Deck Arch of San-Shan Bridge

南京市三山桥是跨越秦淮河的一座重要桥梁,跨径布置为(22.5+40+22.5)m,采用自锚上承式拱桥。文章对自锚上承式拱桥上部结构和下部结构进行了较详细的分析论述,设计实践表明:自锚上承式拱桥方案与周边环境相协调,采用线性规划法设计自锚预应力筋使结构满足正常使用和承载能力要求的同时达到了平衡拱脚推力的目的,提高了在软弱地基上建造拱桥的适应性和经济性。

The San-Shan Bridge in Nanjing City is an important bridge over the Qin-Huai River. The Bridge is a self-anchored deck arch bridge which span arrangement is 22.5＋40＋22.5m. The superstructure and the bridge substructure of this bridge were analyzed in this paper in details. The self-anchored deck arch bridge is in harmony with the environments outside. And the linear programming method used in prestressed tendon de- signing in the bridge for self-anchoring effect was effective. The limit states of bearing and serviceability were guaranteed and the horizontal force in the foot of the arch was balanced？too by the measure. In the benefit of linear programming method the adaptability and affordability in arch bridge construction in soft foundation were improved.