2025-11-01    211

　　Steel structure projects have an extremely wide range of applications, covering high-rise and super high-rise buildings, large-span and large-space buildings, a large number of small and medium-sized industrial, commercial, community, cultural, educational and health buildings, bridges, towers, most low-rise non-residential buildings, and various structures. The components of steel structures can be manufactured in factories and installed on site, resulting in fast construction progress. Currently, steel structure buildings in developed countries are characterized by wide application and large steel consumption, and the advantages of steel structures have been confirmed by practical applications in advanced countries. In Europe, the Americas, Japan, Taiwan and other regions, all factories are built with steel structures. In the United States, about 70% of non-residential buildings and buildings with two floors or less adopt steel frame systems.

　　In structural reinforcement, the key applications of steel structures include adding new steel structure floors, additional steel stairs, steel platforms, steel-concrete composite columns, and adding steel structures to concrete beams. Adding new steel structure floors can realize building story-adding without significantly increasing the load of the original structure, solving the problem of insufficient space in old buildings and widely used in the transformation of office buildings and dormitory buildings. Additional steel stairs and platforms can quickly expand vertical transportation and operation space, adapting to the needs of factory production line upgrading and commercial mezzanine construction.

　　Steel-concrete composite columns significantly improve the compressive and shear capacity of columns by wrapping section steel or embedding steel skeletons in concrete columns, adapting to the reinforcement of industrial buildings with increased loads. Adding steel structures to concrete beams (such as bonded steel, wrapped steel or additional steel trusses) can effectively repair problems such as beam cracking and excessive deflection, restore and improve the load-bearing performance of beams, and are often used in the structural reinforcement of public buildings such as teaching buildings and shopping malls.