Analysis Of Some Problems On Designing The Approach Of The Second Jiaojiang Bridge

Based on the design scheme of the approach of the Second Jiaojiang Bridge, this thesis briefly introduces its basic materials and design, analyzes the design scheme systematically, put forward and solve some problems related to the design scheme.First, under the overall principles of bridge design "safety, applicability, economy and endurance", this thesis analyses in detail the economy of the approach of the Second Jiaojiang Bridge span arrangement, the river bridge anticollision and the durability of the concrete structure design. According to a continuous box girder selected in the approach, this thesis carefully analyses its structure, prestressed beam layout, modeling and calculation. This thesis discusses the poor stress state of the end of beam and the fulcrum section stress control according to the calculation and analysis, and put forward the solutions. Next, taking the south approach SZ04box girder as the research object, this thesis discusses the value of bearing offset on small radius of the prestressed concrete continuous box girder, and obtains the relationship between difference of two bearing counter-force on the same pier and bearing offset. Finally, there is quantitative analysis on the segmental construction of some parts of the approach of the Second Jiaojiang Bridge to reduce the loss of prestress effects.By clarifying several design problems on the approach of the Second Jiaojiang Bridge, this thesis analyses the problems related to the plan arrangement, selection of bridge types and detailed design of a grand bridge and puts forward the solutions. It will also has the enlightenment and guidance for the other grand bridge design...