With the development of economy and in.ease of vehicle in China,there exist inevitably structural defects in some existing bridges.Thus the reliability assessment strengthening technologies for existing bridges is ing more important.The reasonable assessment a lot of investment,and at the same and time strengthening
scheme the most effective scheme Call be obtained.
Prestressed concrete bined arch bridge has been constructed in Guizhou province at 1 980s~1990s.It contributed to the development of arch bridge.After several years use,the disease of cracks and deformation has appeared on it.
The reinforcement methods in coinlnon used is increase cross-section
reinforcement method,prestressed reinforcemem method,paste plate reinforcement method,carbon fiber reinforced plastic methodjet concrete reinforcemem method and SO on.Among the many methods of reinfomemem in concrete structure,paste plate reinforcement method,increase cross.section reinforcement method and carbon fiber reinforced plastic method is widely used.This paper introdu.ce the principle and calculation of the three methods.
In the thesis,as an example of Huayudong bridge in Guizhou province,firstly analysed the causes of bridge disease,then put prehensive methods of reinforcement,including additional members, steel plate and acarbon fibre. Calculations were performed by finite element software Doctor Bridge and ANSYS. Capacity reinforced met demand of Code,the bridge is in good condition.
KEY WORDS:Prestressed Concrete bined