Analysis Of Construction Stage Of Prestressed Concrete Continuous Girder Bridge

Prestressed concrete continuous box girder bridge has many advantages,such as large structural rigidity,small deformation,less expansion joints,good driving comfort,strong wind resistance,earthquake resistance,and later maintenance.With the development of high-strength materials and hanging basket cantilever construction,prestressed concrete continuous box girder bridge is more and more widely used in railway construction.At the same time,with the development of Midas/civil,ABAQUS 6.12,a series of finite element software,the speed and accuracy of the bridge structure is more and more high,but also can be established by the finite element model and the actual structure of the construction phase simulation,the overall alignment and stress calculation analysis,box type local stress analysis.It provides a great help for the construction monitoring and control of the prestressed concrete continuous box girder bridge.However,the bridge engineering has the particularity,the construction of each process is not reversible.Therefore,the bridge construction process of theoretical calculation data and actual measurement data are inevitable there will be differences.This also requires the engineering and technical personnel to theory and practice,the continuous box girder bridge construction process of linear and stress monitoring and control work.In combination with the white Lazhai a 4th line bridge,span: 32+48+32 m continuous beam,using finite element analysis software MIDAS civil and ABAQUS 6.12,the overall shape of the bridge structure analysis,the main control section stress analysis,0 of the largest cantilever stage by force analysis and.And the result of this calculation is used in the construction process.This article mainly studies the contents of several aspects:(1)a brief description of the characteristics and development course of prestressed concrete continuous box girder bridge is made,and the current bridge construction monitoring control and construction method are introduced,and their advantages and disadvantages are analyzed.(2)using finite element software MIDAS civil.According to the white Lazhai,a four line bridge(32 + 48 + 32m)to establish three-dimensional finite element model.In accordance with the construction design documents,combined with the characteristics of the field,respectively,the construction of the cantilever construction of the beam section of the bridge,the pre stress,hanging basket and other stages of the analysis of the model,how to improve the accuracy of the finite element model,the authenticity of the in-depth analysis.(3)using the finite element software ABAQUS 6.12,the internal force,displacement and load method is used to analyze the local stress of bridge 0.The local stress of box section under the maximum cantilever state of 0 block,and the form and cause of formation of the cracks are analyzed.(4)the strength,rigidity and stability analysis of the main components of the hanging basket cantilever construction using civil Midas.(5)for continuous beam bridge construction site monitoring and control two aspects--should force monitoring and linear monitoring,perfect monitoring system,and puts forward the factors of affecting the accuracy of construction monitoring were analyzed and compared with theoretically calculated differences between the data and the actual data of construction,put forward by adjusting the parameters of construction control to control the hanging basket cantilever construction stage,white Lazhai a 4th line bridge closure smoothly made great contributions,and provide some help for better guidance to the continuous beam bridge construction monitoring.