Abstract: Focusing on the high data redundancy,the single function and the unfriendly user interface of the ordinary standard parts libraries for section bars,the parametric design method of section bars and the mechanical analysis model of the beams are studied.A new standard parts librariy of section bars and a software for beams designing are establish though using Visual Studio 2005,ADK and SQL Server 2008.Three-dimensional CAD software SINOVATION is used as a platform to complete the development.The standardized design of section bars,computer-aided mechanics analysis of beams and output of design report are realized.Finally,a crane’s main girder study case and a lathe spindle study case illustrate the high efficiency and intuition of modeling of the beam design software.

Key words: CAD, beams, parametric design, mechanical analysis, secondary developement