Design and Monitoring Analysis of Prestressed Concrete Continuous Box Girder Reinforcement with Additional Prestressing
In view of variable section prestressed concrete continuous box girder with transverse,L-shaped and U-shaped stress cracks,the reinforcement and treatment scheme of"adding a long prestress inside the box and a short prestress outside the box"is pro-posed.The external cable force,critical section strain and deflection are monitored during construction period and operation period after reinforcement.The results show that the bottom stress state of the second span beam on the left is effectively improved after the addition of prestressed reinforcement,and the actual bearing capacity of the bridge is increased.During the operation period after reinforcement,the overall changes of external cable force,key section deflection and strain are stable,and there is no obvious irreversible unidirection-al change trend,and the overall working performance of the structure is good.
prestressed concrete continuous box girderadditional prestressbridge reinforcementoperation period monitoring
NETL
NSTL
万方数据
维普
