First of all, compared with other building materials such as concrete, brick, and wood, building steel has much higher strength and high elastic formwork, so the structural components are light in weight and small in section. Because of the lightweight of steel structure frame under the same stress condition, not only the earthquake action can be significantly reduced, then the internal force of the structure can be reduced, but also the cost of the foundation can be reduced. This advantage is more obvious in the soft soil area. In addition, the components are light and easy to transport and install. Therefore, steel structure constructions are especially suitable for super tall buildings, large span fabric space steel structure factory, heavy steel structure industrial building, bridges, towers, and other structures. Many famous buildings at home and abroad adopt steel structures or composite structures which are composed of steel and other materials.
Second of all, when the steel components are assembled on the construction site, simple and convenient welding connections or bolt connections are used, and the connection between steel components and other material components is also more convenient. Sometimes steel components can be assembled into larger units on the ground or even assembled into a whole before hoisting, which can significantly reduce the amount of aerial work and shorten the construction period. The short construction cycle makes the whole steel structure construction put into use earlier, not only shortens the period of capital flow but also receives the investment return in advance, so the comprehensive benefit is high.
The last but not the least, the mode of steel structure construction is dry construction, which can avoid the environmental pollution caused by wet concrete construction. The steel structure frame material can also be transported during the smooth traffic at night without affecting the daytime traffic around the buildings in the downtown area, and the noise is also low. In addition, the steel structure which has been built is easy to be strengthened and reformed, and the steel structure connected with bolts can be removed according to the need, which is also beneficial to protect the environment and save resources.