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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.