Research On The Development Of Bridge Parametric Modeling Program Based On VTK

China is in the stage of large-scale construction of high-speed railway,which makes the construction of long-span bridges inevitable.At the same time,with the rapid development of computer and network technology,the finite element analysis of bridge parametric and intelligent modeling has become an inevitable trend in the future.Based on VTK and QT,this paper develops a program for parametric modeling of continuous rigid frame bridge,and completes the finite element post-processing analysis and visualization research.The main contents and research results are as follows:1.From the perspective of scientific computing visualization and parametric bridge modeling,it introduces the current research and application status of bridge parametric modeling at home and abroad,as well as the modeling methods and procedures of several applications.On this basis,analyze and summarize the advantages and disadvantages of various modeling methods,future development trends and the possibility of mutual integration.2.Introduce the basic framework of VTK and QT,combine the visual rendering pipeline of VTK with the GUI module of QT to build the basic framework of the entire system,and realize the user interaction interface of each module.3.Based on the visual framework of VTK and the graphical user interface framework of QT,the basic modules of pre-processing such as nodes,elements,loads and boundary conditions in structural finite element analysis have been developed,and the above modules are combined to complete the bridge parametric modeling analysis.Combining the pre-processing data information in the structural finite element analysis with the data structure of VTK and QT to design a data interaction module.At the same time,develop and design modules that can use Excel and database to store and read related data.4.For the conventional cross-section of continuous rigid frame bridge,use VTK to realize the visualization of the cross-section.Analyze the definition form of the bridge section and calculate the section characteristics.5.Combine the above modules,perform finite element analysis and calculation on the bridge,and realize post-processing visual analysis on this basis,as well as visualize the data.6.Based on the established bridge model,carry out the statistics of the engineering quantity,the perspective observation of the prestressed steel beam,and the update of the lens and the interactive system.