Study And Development Of Bent Cap CAD Based On.NET API And AutoCAD

With the fast economic growth, our country's highway construction has entered a period of rapid development. A large number of bridges have been used in highway construction. However, bridge design is a very complex and onerous task. In order to improve the quality and efficiency of bridge design, reduce the bridge engineers' labor intensity, shorten the design cycle of a bridge, and save the cost of bridge construction, bridge CAD system is introduced and has been widely used. The application of bridge CAD system provides new means and new methods for bridge design, which promotes the technological progress of bridge industry. The quick development of contemporary computer hardware and software technology and graphics display technology provides platform and technical support for the development of a new generation of bridge CAD software. In this context, the institute of bridge design approves the bridge CAD system research project.As a subproject of bridge design expert system research project, this project studies the status quo and development trend of domestic and abroad bridge CAD systems, and then conducts a systematic study of the technology for developing bridge CAD system. On the basis of the overall analysis of the bridge CAD system, this paper analyzes the demand of bent cap steel drawing module, commits overall design and then takes the high pier T-type bent cap in Beam Bridge as the research object. Taking the program drive parameterization approach as the guiding ideology, the research and development of high pier T-type bent cap drawing module based on.NET API and C#is carried out. Ultimately, the function of drawing high pier T-type bent cap steel graphics completely is realized.The thesis focuses on the detailed design of high pier T-type bent cap steel graphics drawing module. The bent cap steel graphics consists of elevation, floor plan, profile, skeleton sample, block steel graphics, quantity table of steels, technical note and frame etc. According to whether the oblique crossing angle is right angle, the high pier T-type bent cap can be divided into two types:orthogonal and oblique crossing bent cap. The annotation and layout under orthogonal case is simple, while parameterization and annotation under oblique case is complicated for the existence of diagonal ribs. In order to raise the code reuse rate and reduce programming workload, the thesis blends the orthogonal and oblique crossing case together to develop. Object-oriented programming approach is enrolled to design the drawing function menu at development stage, define function which can create basic entity, a variety of dimension label, quantity table of steels and technical note, and add graphics layer. When it comes to the layout of each graphics module, impact of factors such as single or double skeletons and the number of cross-section is taken into consideration. Finally, two categories, a total number of8kinds of layout style are designed, which can basically satisfy all kinds of complicated situations.