Research On Erection Scheme Of Three-Tower And Four-Span Suspension Bridge Of Steel Truss Girder Based On BIM Technology

Three-tower and four-span suspension bridges have attracted more and more attention because of their super-strong spanning capacity,and their application is more and more extensive.Steel truss girder can improve the stiffness of the whole bridge and can be used as a double-deck bridge.The combination of three-tower suspension bridges and steel truss girders will be more and more popular.There are still many problems to be studied in the design and construction of this structure.BIM technology has been greatly developed in many fields because of its digitalization and informationization and intellectualization,and it has been introduced into China for more than ten years.It has been widely used in civil construction,tunnel,water conservancy and hydropower,etc.However,its application in bridge engineering is still in the preliminary stage.The development of BIM technology in the next step will bring about tremendous changes in the design,construction and maintenance of the bridge.Based on the engineering background of Oujiang Beikou Bridge,this thesis analyses the hoisting construction process of three-tower and four-span steel truss girder,combines with BIM technology to establish a 4D simulation model,and perfects the erection scheme of steel truss girder through BIM technology research.The thesis mainly includes the following contents:In this thesis,the full bridge bridging model is established by using the bridge nonlinear analysis system BNLAS,and the whole erection process of three-tower suspension bridge is calculated and analyzed by inversion analysis method.The lifting sequence from mid-span to tower and from tower to mid-span,which is often used in the erection process of steel truss girder,is simulated and calculated separately.The anti-sliding criterion oriented to sliding process is adopted to carry out the asymmetric suspension girder.The influence of different connection modes of stiffening beams,such as articulation method,rigid connection method and rigid hinge combination method,on the structural stress and main cable displacement during construction is discussed.Finally,a reasonable construction plan is determined by synthesizing the construction conditions and so on,and it is verified.In this thesis,the Revit of Autodesk platform is used as the core software to create a family of parameterized members of bar and bridge deck.Dynamo,a visual programming tool,is used to combine the data calculated by finite element method with the position coordinates of the model.A 4D model of steel truss beam with construction location information is established for stiffening beam.The construction progress and deformation can be simulated in real time by BIM technology.At the same time,the prediction method of collision detection using software is put forward for the possible collision of stiffening beams in construction,and gives the construction Suggest.This thesis studies the erection scheme of three towers and four spans steel truss girder by finite element software,which can provide reference for similar bridge construction in the future.The 4D model of stiffening girder established by Autodesk platform software can also provide a train of thought for the application of BIM technology in bridge engineering.