State Estimation Of Sub-construction And Control Technology Of Prestressed Concrete V-shaped Pier Continuous Rigid Frame Bridge

The construction simulation analysis, construction control technology, closure technology and its performance of the prestressed concrete V-shaped pier continuous rigid frame bridge were studied in this thesis. Taking a three-span V-shaped pier continuous rigid frame bridge in Taihe County as a engineering example, and establishing finite element model by using finite element program, the structure of V-shaped pier and box girder was analyzed under the simulation of the construction step. And the force characteristics and the changes in the law of V-shaped pier continuous rigid frame bridge were studied during the construction.In addition, the construction control theory of bridge structures was summarized, and the contents of construction control, construction monitoring methods and error analysis were described in detail. According to the construction characteristics of V-shaped pier continuous rigid frame bridge, the self-adaptive control method is used for phased construction of these bridges. And, some conclusions can be acquired and some propositions are provided.Finally, the calculating of closure jacking force for V-shaped pier rigid frame bridge was studied. The horizontal jacking displacement at pier top which caused by the difference of closure temperature as well as the shrinkage and creep of concrete is calculated. Taking Ying River bridge which is a three-span V-shaped pier continuous rigid frame bridge as a engineering example, and using of finite element structural analysis method, the closure jacking force is calculated under the cases of the difference of closure temperatures and orders. The results of internal force and displacement were analyzed comparatively and some conclusions were given, so that it can be referred by the practical construction work.In this thesis, a number of useful conclusions were drawn based on an accurate calculation. Some important theoretical and practical engineering value is guided for design and construction of prestressed concrete V-shaped pier continuous rigid frame bridge.