Research On Construction Control Technology Of Main Girder Of Single Tower Cable-Stayed Bridge

The single tower cable-stayed bridge has good mechanical performance and good anti-shrinkage and creep ability.Under similar conditions,Comparison of single tower cable-stayed bridge and double tower cable-stayed bridge,The single tower cable-stayed bridge has economic superiority because of saving a foundation,but also by setting a long no cable area significantly for reducing the amount of cable,The single tower cable-stayed bridge has high technical content and difficult construction,and the construction control problem of the main girder is the key to ensure the mechanical state of the bridge and the main beam.This paper takes the new Jinggangshan Bridge as the engineering background,Through the establishment of the three-dimensional finite element model of the new Jinggangshan Bridge,This paper focuses on the construction control of the internal force of the main girder of the steel girder and the cable tension.and the discussion of The sensitivity of the bridge structure parameters.The main research contents are as follows,(1)Basing on the contents,methods and principles of the construction monitoring of the single tower cable-stayed bridge,using the Midas/Civil software to the stress of the steel girders and dikes during the construction of the new Jinggangshan Bridge,and having verified the applicability of finite element in practical engineering.(2)Selecting the Midas/Civil software to simulate the simulation of the main girder cantilever process.and getting a conclusion of unfavorable location of the internal force distribution of the steel girders,during the construction phase,and the influence of the maximum construction load on the unfavorable position of the internal force distribution of the steel girders.(3)Basing on the frequency method,using the finite element software to have analyzed the influence of single cable stayed cable damage on its own cable force value and the influence law of other cable stayed state.Further analysis of the influence of other cable-stayed forces,under the adjustment of Cable Force of Single Cable.(4)Through the simulation of finite element software,having analyzed the influence of the sensitivity of the main parameters such as temperature load,construction load,Cable tension force,on Cable-stayed bridge main beam and Cable tension force which lays the foundation for the selection of the basic parameters of the finite element.