减载法在梁式桥加固设计中的新应用

New Application of Load Shedding Method in Reinforcement Design of Beam Bridge

结合上海市某立交改造项目,提出了切割减载的方案,并结合桥面铺装方式进行了纵横向验算,现场通过横向预应力切割应力测试,取得横向有效预应力,为横向预应力补张拉提供了有力依据,经计算横向应力、承载力和裂缝宽度均满足规范要求。

Combined with an interchange reconstruction project in Shanghai,the load cutting and shedding scheme is put forward.Combined with the deck pavement mode,the vertical and horizontal check calculations are carried out.The cutting stress of transverse prestress is measured on site to obtain the transverse effective prestress,which provides a strong basis for the transverse prestress tension.The calculated transverse stress,bearing capacity and crack width can all meet the requirements of the code.