Research And Program Development Of Curve Bridge Design Modeling Technology Based On BIM

BIM technology has the characteristics of visualization and coordination,which can improve efficiency,save resources and reduce costs in engineering projects,so it is gradually promoted in the field of bridge engineering.As a common form of bridge structure in bridge engineering,curved bridges has the problems of complex parameter calculation and difficult model creation in BIM modeling.At present,there is still a gap in the research about using the program for modeling curved bridge design.To solve the problem,this paper uses Revit secondary development technology with C# language to develop a design modeling program which applies to pre-stressed concrete curved bridges.The program realizes the function of modeling 3D curved bridge structures with complex curve information.Finally,this paper also conducts a study of its BIM model information management and application.The details are as follows:(1)Based on the design modeling requirements of the curved bridge,the information level and five main functional modules of the program are designed,which including the route module,substructure module,main beam module,prestressing module,and model information management module.The program architecture is proposed based on the route module,and other modules are calculated based on the position information provided by the route.(2)In the route module,the function of creating a combined line pattern and extracting the position information of any point on the route is implemented.Then,based on the information provided by the route module,the module for creating the substructure model is designed.(3)In the main beam module,three types of beam elements are set up according to the curve type.The function of automatically selecting the appropriate beam element and calculating their parameters based on the beam element segmentation and the curve information is realized,which improve the accuracy of the main beam model to fit the actual curve.Then the longitudinal profile and section change of the main beam model are calculated and realized based on the position information.(4)In the prestressing module,two methods,coordinate system conversion and program automation,are used to create a longitudinal prestressing beam model of a curved bridge with a complex 3D line pattern,and the modeling accuracy is controlled by setting the step parameters.(5)Combined with an example of a continuous rigid curved bridge project,a complex 3D structural model was created which was difficult to be done manually.The model successfully pass the collision check,which certify the feasibility of the program architecture and the practicality of the program functions.(6)Using the program to generate script files that can be run by Abaqus,this paper solved the problem of information loss when a large number of Revit models are imported into Abaqus.The program realized the import of BIM models into Abaqus with parameters.In addition,the data format conversion was researched with XML format files.And the functions of data output and reading are developed,which realizes the XML format storage of program structured data.