The lightweight nature of steel structures, despite their high density, is due to their excellent mechanical properties, which allow them to bear significant loads. Therefore, steel structural components have smaller cross-sectional dimensions, resulting in reduced weight and ease of transportation.

2. The material exhibits uniformity, aligning well with the assumptions of mechanical calculations. The internal structure of the steel is relatively uniform, approaching an isotropic body, and is almost completely elastic within a certain range of stress. Consequently, the actual stress conditions of steel structures correspond closely to the outcomes of architectural mechanical calculations.

3. Steel structure manufacturing and installation are highly mechanized. Steel structures possess a certain degree of technologically intensive nature, with a single material used, which is finished and easy to process. The high level of mechanization ensures rapid production, easy quality assurance, and is suitable for mass production. From factory processing of components to on-site hoisting, the industrialization level is significantly higher than that of labor-intensive cast-in-place reinforced concrete structures.

4. Structural Steel Installation: Simple and Efficient Structural steel, produced by specialized metal component factories (beams, trusses, columns, etc.), is easily assembled on-site using electric welding or bolts (or high-strength bolts). This simplified and rapid installation process enhances construction speed, has become a key factor in reducing construction costs, and has shifted the structural cost issue to a secondary position. Moreover, bolted steel structures are convenient for modification and demolition.

The flexibility of steel structures in plane layout is another significant feature. In today's information age, there are stricter requirements for indoor layout, space, and internal facilities. The original layouts and equipment may soon become less or not suitable, but steel structures can offer greater possibilities for reconfiguring the plane, thereby extending the lifespan of the building.