1.1 Steel development status

The development of steel has become an important part of the development of steel structure buildings, in order to meet the needs of the construction market, finished steel will gradually move towards the direction of complete varieties and standardization of materials. The domestic building steel structure has shown a rapid development momentum in terms of the quantity, variety and even quality of steel, which provides an important environment for the development of steel structure buildings. The output of shaped steel and coated steel plates in other steel structures has increased significantly, and the quality of products has also been significantly improved, and corresponding new steel sections such as large fire-resistant, weather-resistant steel and ultra-thin hot-rolled H-shaped steel have been gradually used in the project, paving the way for the future of steel structure buildings.

1.2 Development status of steel structure design and construction methods

The specifications of steel structure design are continuously improved, which also provides an effective guarantee for the designers of China’s steel structure industry to improve their professional literacy, and various forms of steel structure design software suitable for the use of computer technology have been gradually developed. In recent years, China has made great progress in the construction technology of steel structure, such as the lifting slip technology with a large span, the microcomputer hydraulic overall lifting technology with intelligent system, and the software simulation technology used in the construction and installation of steel structure. Among the existing steel structure buildings, there are many typical successful cases, such as the twin frame slip in the passenger terminal of Baiyun International Airport in Guangzhou, and the roof slip in the sports exhibition center in Harbin. Through 3D real-time dynamic simulation, all kinds of construction assembly, lifting test and even optimization construction process are basically completed, and problems existing in the construction scheme can be detected in advance and modified in time, eliminating the procedure of site trial assembly and achieving twice the result with half the effort.

1.3 Current achievements of steel structure buildings in China

In the development of steel structure building in China, “Bird’s Nest” because of its large span, strange structure and shock, it echoes with the “Water Cube”, reflecting the excellent technology of China’s steel structure, and is taking big steps to the world, especially the use of such technology in the Olympic Games, more recognized by the world. These two buildings combine the new, strange, delicate, beautiful, magnificent in one, to show the world the gorgeous answer of China’s current architectural steel structure