Deepening Of Research And Development In Sheet Structure CAD

As a new structural system, sheet spatial structural system has an advantageous characteristic as 'light weight and high strength, and can be extensively used in floors with different spans, bridges, high-rise buildings, etc. SPace Structure Analysis system software (SPSA) is helpful to spread application of the new structural system. Being the computational and analytical core of SPSA, Spatial Structure Finite Element Analysis software (SSFEA) is indispensable to optimization module. Microsoft VC++ 6.0 being compiler, SSFEA is run under AutoCAD 2000 with ObjectARX 3.0 to be secondary development tool.In this article, the finite element theory,algorithm and construction drawing CAD are emphasized.At the beginning of this paper, the sheet spatial structure system and secondary developing tool are introduced, and then the advantages of ObjectARX on SPSA system based is given. Subsequently, the eight-nodded isoprametric curved quadrangle element and spatial beam are discussed detailedly in the finite element method. Especially the front solution method to the group of linear equation is analyzed. Then the modified front solution is presented. With improvement of SSFEA, the reliability is approved further and function is expanded. And upgrade of it is not difficult because of its appropriate data interface. In final, the programming design about construction drawing of sheet structure is presented in detail. Then the method and idea about the Computer Aided Design of the joint in the steel structure is presented in the object-oriented programming method.