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The principle of material selection of steel structure is to ensure the bearing capacity of load-bearing structure and prevent brittle damage under certain conditions, according to the importance of the structure, load characteristics, structural form, stress state, connection methods, steel thickness and the working environment, and other factors considered comprehensively.

Steel structure engineering building is known as the green project of the 21st century, steel structure has many advantages such as high strength, strong loading capacity, light weight, small volume of space occupied, easy manufacture and installation of components, saving wood, etc., so it is more and more widely used in industrial and civil buildings.Steel Frame Buildings and Steel Structure Warehouses are everywhere.

Steel framed structural engineering is a broad and diverse field that involves many types and applications. The following are some of the major types of works:

The spatial grid structure can be divided into double-layer plate-type spatial grid structure, single-layer and double-layer shell-type spatial grid structure. The rods of plate-type spatial grid and double-layer shell-type spatial grid are divided into upper chord rod, lower chord rod and web rod, which mainly bear tensile force and pressure.

In recent years, light steel structure has been widely used in Steel Structure Warehouses, small Steel Structure Exhibition Halls ,Container Homes and office buildings due to its low steel consumption, short design and installation time and high industrialized production degree. This has promoted the development of steel structure enclosure system from unitary to diversified, which in turn has triggered the change of new design ideas and new construction methods.

Transformation and upgrading to industrialization, digitization and greening is a realistic need for the high-quality development of the construction industry and a major trend for the future development of the industry. Steel structure building naturally has the characteristics of Prefabricated, industrialization and greening, giving full play to its advantages of “light, fast, good and economical”, and boosting the high-quality development of assembled steel structure building through the double-wheel innovation drive of technology and management is an important focus point for the development of new quality productivity.