Research On Parametric Design Of Continuous Bridge Based On BIM Technology

Most of the bridges in high-speed railway are mainly box-section beams.From the structural form,the simply supported beams are the most,followed by the continuous beams.In order to meet the rapid and efficient demand of bridge construction,based on the BIM design concept,this paper takes Revit software as the platform and uses Dynamo visual programming tool,aiming to study the BIM parametric modeling and prestressed steel bar modeling of box continuous beam,using the Python language to write the automatic outputs script program for box continuous beam and prestressed steel bar.And the Revit modeling is realized while ABAQUS modeling script is output.In order to provide some help for the realization of threedimensional design of box-type continuous beam bridge.The main work carried out is as follows:(1)This paper studies the basic idea and method of parametric modeling based on BIM,the basic flow chart of using BIM technology in bridge engineering,determines the software platform based on Revit + Dynamo,and introduces its secondary development method;(2)Taking single-box and singlechamber box girder as parametric design sample,creating a general family of parametric box girder,aiming at different bridge alignment,the modeling program of plane curve and space curve is written.And the data are collected by Excel and imported into bridge alignment data.The superstructure model of the bridge can be established with high efficiency and high quality;(3)Compile the automatic layout program for simply supported beam with equal crosssection and pier.Especially when the span of simply supported beam bridge is not equal,the automatic arrangement of simply supported beam bridge with different span is realized,which greatly facilitates the drawing of BIM scheme in the preliminary design stage of bridge.At the same time,the modeling program of prestressed steel bar is compiled to solve the problem that the spatial prestressed steel bar model can not;(4)Based on the ABAQUS calculation software,to use the common characteristics of secondary development language with Revit,the automatic conversion program of single-box and single-chamber continuous beam bridge is compiled,integrated into the Revit modeling program,and the primary modeling operation is realized.At the same time,the Revit model and the ABAQUS model are obtained.The repetitive operation is reduced and the modeling quality is improved;(5)The secondary development program is used to demonstrate the modeling process of three-span continuous beam bridge,and to deal with the BIM modeling,calculation and other BIM applications of continuous beam bridge quickly and accurately.