体外预应力在变截面连续梁设计中的应用

Application of External Prestressing in Design of Variable Cross-section Continuous Beam

塔山京杭运河大桥主桥采用了跨径为72m+120m+72m的预应力混凝土变截面连续梁。该桥桥型美观、施工工艺成熟,后期养护简单,总造价合理。介绍了该变截面连续梁的总体设计、细部结构设计,以及体外束在变截面连续梁中的应用,为该类型桥梁的设计提供了新思路,增强了桥梁的安全储备。

The prestressed concrete cross-section continuous beam with a span length of 72 m ＋ 120 ＋ 72 m is adopted for the main bridge of Tashan Bridge over Beijng-Hangzhou Canal. The reconstructed bridge type is beautiful,the construction technology is mature, the maintenance at later period is simple, and the total construction cost is reasonable. The total design of the cross-section continuous beam,structural design of detailed parts and application of external cable in the cross-section continuous beam are introduced,so as to provide new thought for the design of this kind of bridge and enhance the safety stock of bridge.