Some Problem On Design Of Long-Span Prestressed Concrete Continuous Rigid Frame Bridge

Prestressed concrete continuous rigid frame bridge as a bridge span, due to the presence of cracking and the bottom of the main span box girder span deflection too big problem, so the application subject to certain restrictions. In this paper, Guangxi Laibin Red River Bridge project, for example, under the existing highway bridge design specifications, and considering the bridge engineering geology, hydrology, box-girder structure size and similar rigid frame bridge design and construction experience, try to pre-prestressed concrete continuous rigid frame bridge to optimize the design.This paper describes in detail prestressed concrete continuous rigid frame bridge history and present situation of the kind of bridge problems and development direction, and outlines the content of this study. Through a comprehensive analysis, the size of the structure developed and established a structural model, the application of the Bridge Doctor3.1software model is solved. And Guangxi Laibin Red River Bridge were checking static live load forces, reinforcement design and control of cross-sectional strength, stress checking, checking and other live load deformation.Through the above analysis, calculation and comparison, if we can pay full attention span girder cracking and excessive deflection problems, and the use of computer design analysis, strictly control the construction quality, these problems can be avoided.