| The Secondary Development of CAD is the most popular research central issue in recently, for each industry in the secondary development of the industry to explore. Take the structure profession for example, although has developed many calculation programs, but the AutoCAD-based drawing software is rare. In this paper, we mainly introduce the function application of the softwarwe (GDCAD) which the writer task group has developed, and descriptsource code to achieve some of these features a simple description. Include supporting drawings and supporting calculations aspects:Aided Drawing system construction drawing is built based on the AutoCAD R14 platform, taking VLISP and ARX programming technologies as tools. The subject lasts two years, the joint efforts of the task groups to develop independent graphics software GDCAD, the software features include the following aspects: 1) complete and convenient facilities plan node, large sample mapping tool. 2) embedded "equal law" system automatically generated. 3) extensive professional library, open library management.As the the part of the aid calculation this paper uses Visual Basic.NET for development tools, to do a preliminary discussion of the structural engineering design and calculation. On the basis of analysis and summing up the theory of the basic finite element theory, has now developed the programming for internal force and bar arrangement calculation of two-way reinforced concrete slab, the programming for design calculation and the internal force envelope drawing of continuous beam, the programming for crack and deflection checking of bending components . In this paper, the functions of related procedures, the flow chart of numerical calculation, the ideas of interface design and description of the critical procedures. Finally, verify the rationality and correctness of the procedure's calculating results through specific project examples, and proposed some useful conclusions and recommendations for the development of structure calculation program.AutoCAD second development is an interdisciplinary technology, it relates to software technology and expertise applied to achieve both. The work has been completed, due to the weakness of software knowledge, the outcome of the subject are not very satisfactory. So even though this system has been considered about normative, structural and other factors, and has reached a very high automation and intelligent, this system is still a aided design software (CAD), the designer has the responsibility to check the drawings on each of data and graphics. |
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