Study Of Cast Segment For Outer-packed Concrete Of Large-span Stiff Skeleton RC Arch Bridge

With the development of long-span concrete arch bridge, stiffened scaffolding method is becoming more and more widely used in arch bridge construction. The key to the stiffened scaffolding method is how to make sure the pouring method and the pouring length of stiff skeleton encased concrete structure. Though comparative analysis of pouring length of encased concrete have been taken to every concrete arch bridge with stiff skeleton, the construction can not be the perfect instruction to the arch bridge construction. Therefore, this paper carried out the following researches based on conclusions which are summarizing existing encased concrete pouring length in this paper.1. Based on principles of arch ring linear control, numerical method was used to calculate the deflection influence line of stiff skeleton control section.2. Adopting superposition method to solve Influence line, A mathematical model to simulate the pouring process of whole stiff skeleton encased concrete was built.3. On the basis of exhaustive algorithm theory, computational programs was written by software VB to solve the feasible solutions and get pouring program.4. To verify the correctness of the mathematical model in this paper, the finite element spatial model of Wanzhou Yangtze river bridge was built, and carried out the simulate analysis of eight-working surface concrete pouring construction, and compared eight-working surface with six-working surface which is used in fact.As the calculation results show, eight-working surface pouring program can solve the problem of the upper and lower deformation of arch ring, make homogeneous deformation of arch ring and the arch concrete stress can be controlled in material allowable range.