Study On Key Technique And System Development Of Visual CAD Of Arch Dams

Because of the complication in the design, calculation and construction of arch dams, Computer Aided Design (CAD) on arch dams is used much more widely and the demand to it is higher and higher. It is an important research subject in the development of the soft wares for arch dam design and analysis that it includes friendly interactive user-interface, efficient data-manage, high integration and nonlinear simulation analysis. In this paper, the actuality of Computer Aided Design of arch dams is summarized, the visual CAD of arch dams (ADVCAD) is developed which is integrated with 3D finite element intelligent modeling module, the data interface with ANSYS is realized, and GouPiTan arch dam is analyzed by means of 3D FEM simulation methods.1. Based on the theory of visualization and parameterization theory and the design criterion of arch dam, the Object Oriented Programming (OOP), visual interface design and graphics-processing technique is analyzed. The visual CAD system of arch dams is developed.2. The drawing module is developed that based on secondary development tool of AutoCAD—Visual Basic for Application, and realized the automatization of arch dam design drawing.3. The secondary development technique of ANSYS and the interface technique between AutoCAD and ANSYS are analyzed. Based on the characteristic in the modeling of arch dam, a new modeling idea and design method is raised, which developed a 3D finite element intelligent modeling module by using VBA in AutoCAD and combined AutoCAD with ANSYS.4. The integration frame and expansibility of ADVCAD is studied. Open interface is set for the undeveloped and possible extended module of ADVCAD.5. The theory of Structural non-linear simulation of arch dam is studied, and the actualization of it on ANSYS is studied.6. The finite element model of GouPiTan arch dam is established by using 3D finite element intelligent modeling module of ADVCAD. And the dam is analyzed by nonlinear finite element simulation methods, which considers transverse seam. A good achievement is received.