Research On Prestressed Concrete-filled Steel Tubula Continuous Rigid-frame Bridge

PC continuous rigid-frame bridge through the constant development in recent years, formally the structure has been very perfect. But through built-span continuous rigid-frame analysis,with the increase of span,PC continuous rigid frame bridge there is a lot of deficiencies, such as the proportion of dead load is too large lead to load-carrying capacity is not high,lack of shear capacity of thin-walled box girder web .In order to solve the above shortcomings, The author of this article, on the basis of the related documents which described a variety of concrete-filled steel tubular continuous rigid frame bridge, composed a new type of concrete-filled steel tubular space truss continuous rigid frame bridge.In this paper, a study focusing on the following aspects of work:①that have been built in steel concrete beam bridge design, calculation, etc. were introduced to sum up the new bridge type of the advantages and disadvantages, proposes the space truss structure in the king post structure the utilization potential.②has carried on the reorganization to the present stage truss theory, introduced with emphasis the pre-stressed truss technology's development and the multi-layer space truss structure's stress, the pre-stressed space truss is suitable for the greatly cross bridge structure.③in the summary formerly constructed above the steel pipe concrete truss continual rigid frame bridge foundation, take the Shuitu Jialing River big bridge as the project background, tried to design one kind of same span pre-stressed steel pipe concrete truss continual rigid frame bridge, has carried on the computation analysis through the finite element software to it, and has carried on the contrastive analysis with the water and soil Jialing River especially big bridge.④carried on to the panel point have tried the design. In above the MERO system node's foundation, is summarizing Japan's Buzu group system node and France's Catena system node merit, designs one kind suitably to try to design the truss stress characteristic the node.⑤Design of the construction technology. In this paper, reference to previous steel bridge construction methods and trial design in the form of a bridge based on its construction technology has been simplified design and key technology and a certain amount of introduction. Through the design of the bridge test mechanical analysis, economic comparison, the node design and construction methods of the design come to this truss-type continuous rigid frame is feasible.