RESEARCH AND APPLICATIONS OF PREFABRICATED STEEL STRUCTURE BUILDING SYSTEMS

The development of steel structures can resolve excess capacity of steel industry and promote building greenization, industrialization and informatization. Promoted by the national policy, the assembled steel structures in China have marched from v1.0 towards v2.0 quickly, during which three new types of building systems have been developed, including the improved system based on traditional steel structures, the modular construction system, and industrialized residential building system. Under the new situation, precast concrete components have solved the traditional problems of steel structures, new types of envelope system have been developed due to the application of different walls, and information technology speeded up the development of the construction industry. Fully assembled steel frames and box-type modular building systems are new types of low-rise multi-story construction system which use the design concept of "building elements". They are based on the combination of basic components including structural components and building functional units, which have the advantages of assembly, integrated envelope, industrialized production and so on. The new MCFTS (Multi-Core Concrete Filled Steel Tube System) high-rise steel structure system is suitable for residential and public buildings. The MCFTS consists of multi-core concrete filled steel tube frame-braced residential system and multi-core concrete filled steel shear-wall-concrete filled steel tube frame system for public buildings. The MCFTS takes the combination of multi-core concrete filled steel tube column and the double side plate beam-to-column connection as its core technology. It can be concluded that the system has excellent seismic performance and can be repaired.