Study On Construction Control Of Prestressed Concrete Continuous Girder Bridge Based On BIM

Prestressed concrete continuous girder bridge is a common bridge type in bridge engineering.Cantilever casting method is often used in construction,and the construction process is complex.Accurate control of the construction process is the key to improve the construction quality,efficiency and ensure the safety of the bridge in operation stage.With the gradual maturity of BIM,bridge construction control based on BIM has become one of the directions of BIM engineering application in recent years.Based on the comprehensive analysis of the construction control theory of BIM and prestressed concrete continuous girder bridge,taking the main bridge of Xiaoqing River Bridge as the object,the construction control technology of prestressed concrete continuous girder bridge based on BIM is studied.Firstly,the classification and coding rules of prestressed concrete continuous girder bridge components based on BIM are put forward.The parameterized core component libraries of main girder,main pier,pile foundation,pile cap and bearing are established to enrich the bridge family libraries.Coding information is added to model components,and based on component coding,batch input of component information is realized by Dynamo,which provides a convenient method for rapid input of BIM model information.Secondly,in order to solve the clash of three-way prestressing tendons of block number zero in prestressed concrete continuous girder bridge,the application of BIM in three-way prestressing tendons clash detective of block number zero in prestressed concrete continuous girder bridge is studied and analyzed with the main bridge of Xiaoqinghe Bridge as an example.Using SOLIDWORKS and Revit,three-dimensional models of longitudinal,transverse and vertical prestressing tendons of block number zero in the main girder are established respectively,and then imported into Navisworks Manager to fuse with the cross-platform BIM model.The clash detective of three-dimensional prestressing tendons is realized by Clash Detective function.Results of clash detective show that the clash between three-dimensional prestressing tendons mainly occurs between longitudinal and vertical prestressing tendons.There are more than 900 clash points.By adjusting the collision points found in advance,the clash of three-dimensional prestressing tendons of block number zero can be effectively avoided in the construction process,and the construction quality and efficiency can be improved.Thirdly,a method of transformation between BIM model and FEM model is studied and put forward.By using Dynamo plug-in and Python language to extract component parameter information in Revit model and convert it into MCT commands,which is imported into Midas Civil,the conversion between BIM model and FEM model of main girder concrete is realized.On this basis,the BIM model of three-dimensional prestressing tendons established by SOLIDWORKS is processed,and the DXF files of horizontal and vertical bending lines are derived.The DXF files are converted into MCT command stream by shape generator of prestressing tendons,and the transformation between BIM model of three-dimensional prestressing tendons and finite element model is realized.After establishing the finite element model quickly by BIM model,the simulation analysis is carried out in the construction stage.The stress and deformation variation law of the main beam in the construction process is calculated,which provides guidance for the construction control,and the integration of BIM and finite element analysis is completed.Finally,a data management module for construction monitoring of prestressed concrete continuous girder bridge is developed in Revit.Combined with Revit secondary development technology and C#language,the functions of viewing,extracting and analyzing construction monitoring data in BIM model are realized.Through the application of this module in the construction monitoring of the main bridge of Xiaoqing River Bridge,it realizes more intuitive and efficient management of the main girder alignment monitoring and stress monitoring.Through this module,the measured and theoretical values are analyzed to provide guidance for the construction control of the bridge.