Research On The Application Of BIM Technology In The Design Of Variable Cross-section Continuous Beam Bridges

With the rapid development of science and technology and information technology,the number of bridges has gradually increased,and people’s requirements for bridge engineering construction are getting higher and higher,because of the shortcomings in the traditional bridge construction process and the comprehensive coverage of informatization,China’s bridge engineering has begun to transform to informatization.How to apply information technology to the field of bridge engineering and realize the informatization and intelligent management of the whole life cycle of engineering projects has become a hot spot in the field of bridge engineering in China.With the help of BIM technology can solve these problems well,the current BIM technology in the field of housing construction has implemented many projects,and in the field of bridges due to the particularity of bridge structure,BIM technology is currently in the exploration and application stage and gradually widely used,but there are still some difficulties.In this context,this paper takes the Donggou Bridge in Ezhou City as the research object,studies the application of BIM technology in the design stage,and proposes a bridge BIM design process by using parametric design concepts to solve problems such as the difficulty of modeling variable section continuous girder bridges.The specific research content is as follows:(1)Discuss and analyze in detail the deficiencies in the domestic traditional bridge construction process and the difficulties faced by the current application of BIM technology in the bridge field.This article compares and analyzes the advantages and disadvantages of several mainstream modeling software at home and abroad from the aspects of market environment,software main functions,software operation difficulty,price and cost,etc.,and finds that Revit software has a wide range of applications and a large user group,and it fits well with the domestic engineering environment Due to the advantages of high cost and low price,Revit was finally selected as the research platform.Aiming at the difficulty o f modeling variable cross-section girder bridges,the bridge BIM design process was proposed,and the bridge parametric design research was carried out in the joint application mode of Revit and Dynamo.(2)Based on the "Revit+Dynamo" model,a preliminary design scheme for the parametric design of the variable cross-section continuous beam bridge model is proposed.Classify the components of the bridge project,introduce in detail the parametric creation of the main component family library of the bridge,g enerate component families and establish a parametric bridge family library,including entity families and contour families;create node programs through visual programming Dynamo to extract the size information of each component,spatial location information,etc.,and establish a database;use Civil 3D to create a terrain surface by picking up survey points,import the terrain surface and bridge layout into Revit for alignment,pick up bridge plane curves and vertical curves,and write node programs through Dynamo Realize the creation of the centerline of the bridge,the creation of variable cross-section box girders,and the automatic creation of the substructure of the bridge;finally complete the construction of a 3D BIM model of the whole bridge,and verify the feasibility of the process of creating a bridge model with Revit and Dynamo.(3)Research on the secondary development of Revit to create reinforcement families and the deepening application of Navisworks.Introduced the background,concept and tools of Revit secondary development,combined with C# language to carry out secondary development of Revit API interface,created a reinforcement plug-in,and created a shortcut reinforcement Ribbon panel in the menu bar of the Revit interface,so that the reinforcement can be quickly invoked.Finally,the 3D BIM model of the bridge was imported into Navisworks for collision inspection,construction schedule preparation,lightweight virtual roaming,and the in-depth application research of BIM technology to bridges was completed.(4)By extracting the key control section and importing it into the finite element,the finite element model can be quickly created,and the finite element numerical simulation analysis is carried out,and the strength and stiffnes s of the bridge superstructure are calculated,and the structure meets the specification requirements.Finally,the parametric design of BIM bridges and the significance of realizing BIM forward design are summarized.