Parameter Adjustment And Backward Analysis In The Construction Control Of The Continuous Beam Bridge

In recent years, the prestressed concrete continuous girder bridge is developing rapidly inour country. The effective control and management can make sure that the structural stressand geometry after bridge completed meet the requirements of the ideal state in the process ofcontinuous beam bridge.(1) This paper introduces the current state of research at home and abroad and studies themain calculation methods and takes a full discussion on primary contents and influencefactors in the construction control of bridge. The methods to identify parameters aresummarized in light of the parameter error in the course of construction.(2) This thesis’ engineering example is the504Factory Yellow River Bridge. The modelof bridge structure is builded by the finite element analysis software Dr.Bridge on the basis ofthe actual construction process. It provides theory and data basis for formwork erectionelevation. The ideal geometry of beam is sured by the backward analysis and the stress state iscalculated in each construction stage.(3) From the point of internal force and deformation, the influence of girder joint schemeon construction control is discussed. And the closing scheme optimization is carried out inthis thesis.(4) The main parameters that have a significant impact on structure alignment aredetermined by the use of parameters sensitivity analysis and are identified by least squaremethod. And then they are adjusted in the finite element model for supplying more effectivecontrol to bridge construction.(5) The construction control of the prestressed concrete continuous beam bridge isproved to be successful and the geometry and stress of the bridge meet the designrequirements basically by comparing the calculated value with the measured value.(6) When cantilever bridge construction is operated, the second phase dead load isconstructed ahead of time possibly that must exert an influence on the alignment and stress inthe504Factory Yellow River Bridge. So this article makes a study on this problem.