Support Selection And Optimization Of Bridge Construction

Cast-in-site concrete construction method has been widely applied in the medium and small span bridge construction Because of its construction is convenient, has a widely adaptability, the characteristics of construction machinery and lifting equipment requirements is not high. In recent years, along with the widening bridge, curved bridge structure such as widely used. Bracket and complexity in the form of all had the very big development.Selection for cast-in-place bridge bracket construction the overall performance is better. But the bracket component is mostly composed of steel structure, the stability and strength problem becomes very important. These are the controlling factors for the safe use of stents.This article first to expound the stability of the related theory, and summarized the bailey bracket calculation simplified calculation methods.Then, the article based on a concrete-filled steel tube concrete arch bridge construction,to analyzed the support selection combined with specific construction condition, using the large finite element analysis software Midas/Civil8.05 to analysis the stents. Select the different construction stages, to analysis the strength, stiffness and stability of the stents under the different construction stages. To obtain the support stability buckling model coefficient,and analyzed the influence factors of influence support stability.Finally, combined with specific construction process, to analysis the possible reasons of the supporting values, which have much difference with the actual monitoring value problem.Point out the disadvantages of using simplified calculation model in the process of calculation.In the influence factors on the model optimized, Mainly consider the the change of boundary condition, the way of loading and etc. By analyzing the problem be solved, for the construction of cast-in-situ concrete bridges provided a reference for similar problems in bridge.