An integrated CAD / CAM software system of steel industrial plant structures is developed based on the BIM application. The system is composed of two seamlessly integrated modules: structure calculation module and post-process module, the interface between the modules is clear. And, the complexity of the software development is effectively reduced by this design patterns. Using object oriented programming technology, a series of intelligent solid classes are abstracted to describe parts with deferent geometric information, structure properties and design requirements in real structure. Objects which are instances of these hierarchical C++ classes and logical links between them were integrated into the AutoCAD drawing database to construct a three-dimensional model. Several key functions including parametric shortcut modeling, frames analysis and member checking, three-dimensional solid construction, node design and editing, and drawing generation are implemented. IFC interface and the interface with SAP, ETABS and MIDAS are also implemented.

A complete BIM model consists of the models of multiple professions. In the BIM design of the electric- power industry, different professions are designed by using different platforms, and then all professional models are integrated on a public platform. During the process, data form different platforms need to be converted to the public platform. According to the requirements of Shanxi Electric Power Co., Ltd., this paper studies the data exporting from the structure-model to Revit. All information of 3D entities and tower segments is input into Revit through IFC files, achieving the integration of structural model with other professional models. Lastly, the paper also illustrates the limitations and shortages of data exchange using IFC files.

BIM is difficult to be applied in the management of whole course.This paper has analyzed and has discussed its common causes, then has made further improvement and optimization based on IFC model server. The BIM engine that can be embedded in other management systems is built, and is combined with assembly construction management system and OA process management system in practice, to achieve the Modular Construction Information System based on BIM. It has addressed those common problems of BIM information system in a better way.