The strength of steel is high, and the modulus of elasticity is also high. Compared with concrete and wood, the ratio of density to the strength of steel is lower. Therefore, under the same stress conditions, the steel structure has a small cross-section, is lightweight, and is easier to transport and install. It is suitable for large spans, high heights, and heavy load-bearing conditions. Structure.
Steel is suitable for withstanding impact and dynamic load and has excellent seismic performance. Its internal structure is uniform, and close to an isotropic homogeneous body. The actual working performance is more in line with the calculation theory. Therefore, the steel structure has high reliability.
Steel structural components are easy to be manufactured in factories and assembled on site. The factory’s mechanized manufacturing of steel structural components have high precision, high production efficiency, fast assembly speed, and short construction period. The steel structure is the most industrialized structure.
Because the steel structure is a welded structure, it can be completely sealed and can be made into high-pressure vessels, large oil pools, pressure pipes, etc. with good air-tightness and water-tightness.
When the temperature is below 150°C, the properties of the steel change a little. Therefore, the steel structure is suitable for hot workshops, but when the surface of the structure is exposed to heat radiation of about 150 ℃, it should be protected by a heat insulation board. When the temperature is between 300°C and 400°C, the strength and elastic modulus of the steel will decrease significantly. When the temperature is around 600°C, the strength of the steel will tend to be zero. In buildings with special fire protection requirements, refractory materials must be used protection to improve the fire resistance level.
Steel is prone to rust in a humid and corrosive environment. Generally, steel should be trusted, galvanized, or painted, and should be maintained regularly. For offshore platform structures in seawater, special measures need to be taken to enhance corrosion resistance.
The demolition of steel structure buildings hardly produces construction waste, and the steel can be recycled and reused, which is very environmentally friendly