Large-span Prestressed Concrete Cable-stayed Bridge Construction Control Analysis

In recent years with the development of the social transportation cable-stayedbridge as the preferred type has been rapidly developed at home and abroad. Withincreasing span of modern cable-stayed bridges construction and operation of safetyproblems get increasingly attention.Especially the use of cantilever casting constructionmethod makes the high-order statically determinate cable-stayed bridge structurechange become complicated; inaddition in every construction stage with thecontinuous change of the structural system of the cable-stayed bridge and the load stateinternal force and deformation of structure also will continue to change which makesthe construction process get difficult. Therefore each construction stage of cable-stayedbridge finite element simulation analysis and calculation is very necessary withwhich get calculation theory parameters obtained from each stage of the cable forcethe deflection of main girder pylon displacements in order to analyze constructioncontrol to ensure that cable-stayed bridge structure in each stage of constructioninternal force and deformation has been specification tolerance range main girdermain tower linear comply with the design requirements and the structure itself forcestate is optimal. In view of the above views the main contents of this paper are asfollows：（1）In the base of analyzing the development characteristics of cable-stayedbridge at home and abroad and the present situation of bridge construction developmentcontrol I want to discuss the effects of various potential factors in the constructioncontrol of bridge and varieties square error adjustment methods of cable-stayed theoryobjective content and methods of bridge construction control. （2）Take the cable-stayed bridge in Chongqing as an example I use softwareMIDAS/Civil to build the model analysis of the whole bridge. The static analysis of themain girder of cable-stayed bridge can confirmrationality of the model.（3）After calculating designed linear target linear and camber line I analyzedthe results by six stage construction monitoring mode from single displacement to finderrors validated the full bridge closure bridge surface longitudinal symmetry and thetotal cross section of theory and measured whether the height difference is in theallowable deviation within L/5000.（4）For the backward analysis of cable-stayed bridge cable force calculation ofbridge design comparison of cable force cable force and the measured cableadjusting cable force the verification of accuracy verification of bridge cable forcecable adjustment after cable difference whether all meet the requirements of thestandard±10%cableforceand design.（5）Analysising of the main tower and the main girder stress monitoring in therule of variation of the measured values and theoretical values to meet therequirements of the standard cp最大0.7fckdegree of testing measured value.（6）Establishment of beam time—temperature—deflection curve and providesthe basis for next stage construction formwork elevation correction.