The technique of adding stories of steel structure is a new type of reinforcement and reform situation which is gradually carried out at present. Compared with concrete structure, it has obvious advantages in technique, economy and safety. However, it is not widely used in the world and the design is not perfect.

The research status of steel structure storey adding is very early in China.In order to adapt to the rapid development of building structure reinforcement, transformation and steel structure storey adding project, and better complete the storey adding and reconstruction work of old buildings, China has established academic groups such as building storey adding and Reconstruction Technology Research Committee and reinforcement technology standard committee, forming an active academic discussion and experience exchange environment of steel structure storey adding and reconstruction project.

It can be used in buildings with many additional floors or not suitable to be directly added to the original structure.Generally, this kind of storey adding technology is also known as the jacket frame storey adding structure.The storey adding structure of the outer jacket frame is mainly divided into two categories, i.e. separate type and integral type.In the former, the outer frame is completely separated from the old house, while the latter indicates that the outer frame is connected with the old house structure as a whole.

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