In the detail structural steelwork, according to the problem of components in connection crashing at each other and the problem of the enough space of bolt installation, the paper expounds how to apply collision detection technology on steel structure designing software fast and effectively and then carries out reasonable test on component and node installation model. Based on bounding box and geometric data of objects in three-dimensional space obtained according to a certain rule, the paper deals with mutual relationship between spatial objects in the vector method and effectively solves the problem as well as finally programming collision detection model and bolt installation space test in the designing software of detail structural steelwork (STXT).

Considering the professional features of steel connection-joint design, this paper developed a new computer-aided design (CAD) program which is aiming at solving problems that the connection-joint design results unsuitable for human intervention of the software developed by our country. Program developing and researching is adopted the object-oriented development technique C++ to provide a flexible interactive function which can not only achieve the whole building's automatic connection-joint design of three-dimensional framework but also nodes merging, node design results modification and re-checking by designer. The program can make the connection-joint design of framework fast, simple and accurate to improve engineering efficiency. The achievement has been used in each module of the PKPM series steel structure design software as base class library of steel connection design in dynamic library plug-in form and obtained good application effects.

According to the demand of the whole industry chain of prefabricated building, and based on the independent BIM platform, this project carries out the key technology research on the collaborative work of the prefabricated building design, production, transport and construction, establishes the BIM -based whole process application system of the prefabricated building, and applies it to the demonstration project application. Through the implementation of this project, independent intellectual property BIM platform, software, systems and standards are developed to provide technical support for the whole process application of the prefabricated building. The project fully explores the advantages of BIM technology information integration, improves design efficiency by more than 20%, and reduces 80% manual test and measurement, greatly reduces engineering cost, which has obvious social and economic benefits and promotes the sustainable development of the construction industry.

In order to adapt development of building's, SpasCAD is rebuild. This version improves primarily stability, easy to use and adds support for new technology. New Inspection and display system is designed according to characteristic of building, which can continue to analyze SpasCAD's model. This version provides new function for develop professional software. In this paper, important improvement and new specialty for SpasCAD are introduced.

Advanced the concept of BIM and its successful application in the project by more and more attention, steel detailing design software STXT deepen their thinking on development, the use of 3D model data as the core, parametric modeling and read PKPM design model to build a complete model and the detail design.3D models show real easy real － time view, model checking, automatically generated by the 3D model for a full set of construction drawings and project the amount of statistics, this article will focus on the characteristics described in detail.