Development And Application Research On Computer-Aided Design System In Non-Pole Structures

Based on the features of non-pole structures, the advance of computer aided design of the non-pole structures is summarized, and the CAD system which is applicable to non-pole structures is researched. The objective of this study is to develop a convenient, efficient and safe CAD system, which is similar to exiting CAD system applicable to pole structures. The operator merely input some simple primary data, through some essential steps of operation, and then the construction drawing is directly produced. The research method is to complete different function module using the advantage of software combined with design characteristics of non-pole structures, and connect them with the method of mixed-language programming. This CAD system has three modules, pre-process, core-process and post-process. Main research work and findings from this research include:The overall design of the system is studied, including the interface design, the data processing, the data control, and the storage and transfer of data. This paper detailedly studied how to deal with mixed-language programming in Windows environment with VB and APDL of ANSYS. The Control of calling APDL language through VB programming is developed, which achieved the applying of APDL program as the background computation tool in VB, and the system's effect is improved.Preprocessing is developed with the forms of dialog, which restored the data in the database creating objects for calculating and post-processing.The core-processing is studied, including presenting the mathematics model and calculated methods of computing module of system, carrying out corresponding FEM computer program in APDL Language in accordance with different non-pole structures. The numerical integral program which calculate the tensile force through stress diagrams, the calculation program of the height of tension zone, and the reinforcement calculation program are developed.The post-processor of visualization system is studied, including the display of FEM results, establishing the intercommunicating connection between VB and AutoCAD making use of Active Automation, and drawing 2-D and 3-D reinforcement drawing based on secondary development of AutoCAD.At the last of the thesis, according to an example it concludes that this system reduced the period of...