1.What is meant by steel structure?
What is meant by steel structure, in the language of academic research steel structure is a structure made of steel plates as the leading structure, is one of the key types of engineering and construction structures today. The characteristics of steel plates are high compressive strength, light weight, good overall stiffness and high deformation capacity, so it is especially suitable for the construction of large span and very high and heavy buildings. Steel structure is made of steel column, steel beam, steel pipe truss and other members made of channel steel and thick steel plate; each member is connected by welding, ground bolts or rivets in the middle of the structure.
2.Steel structure characteristics
a. Steel plate ductility, good plastic deformation, proportional material, high structural credibility, suitable for bearing impact driving force load, with excellent seismic grade performance. The internal structure of steel plate material is well-proportioned and tends to be anisotropic homogeneous primary mass. The performance of the steel structure in specific work is more in line with the basic theory of measurement. Therefore, the steel structure is highly reliable.
b. The raw material has high compressive strength, lighter weight itself, higher bolt strength and high elastic mold. Compared with concrete and wood, the ratio of relative density to tensile strength is relatively low, so the cross-section of the members of the steel structure under the same bearing force standard is small, its own weight is light, which helps transport and installation, and is suitable for structures with large span, high aspect ratio and heavy load bearing.
c. Steel structure with good sealing performance, because the electric welding structure can ensure complete sealing, can be made into a very good sealing, tightness of pressure vessels, medium and large oil pools, class II pressure vessels, etc.
d. Steel structure is resistant to high temperatures without fire, when the temperature is below 150 ℃, steel plate characteristics of the transformation are not large. Therefore, the steel structure is suitable for hot production plants, but the surface of the structure is subject to heat radiation above and below 150 ℃, to use insulation materials in many aspects of maintenance. Temperature at 300 ℃ -400 ℃. Bolt strength and elastic mold are significantly reduced, temperature in 600 ℃ left, the compressive strength of steel plate tends to zero. In engineering buildings with unique fire safety requirements, the steel structure must be maintained in many ways using fire-resistant insulation materials to enhance the fire rating.
e. Poor corrosion resistance of steel structures, especially in the natural environment of wet and cold and corrosive substances, very easy to rust. In general, steel structures should be treated with rust prevention, hot-dip galvanizing or architectural coatings, and maintained. For deep-sea service platform structures in the sea, unique countermeasures such as "zinc block anodic protection" should be used to give corrosion resistance.
f. High level of mechanical automation is installed in the steel structure manufacturing, and the steel structure components can be manufactured in the processing plant and assembled at the construction site. Processing plant mechanical automation manufacturing steel structure components manufactured products high precision, high productivity, construction site assembly faster, tight schedule. Steel structure is one of the structures with the greatest level of modernization.
3.Main features of steel structure
Structural steel buildings are lighter in weight, have higher compressive strength, better overall stiffness and higher deformation capacity. The building itself is only one-fifth the weight of a brick structure and can withstand storms of up to 70 meters per second, allowing life assets to be reasonably maintained.
After sealing the structural panels and paper-faced gypsum boards, the light steel structural members produce a very strong "plate and rib structural management system", which has a stronger seismic rating and the ability to withstand level loads, and is suitable for areas with a seismic rating of 9 degrees or higher.
Thermal insulation and heat preservation
Glass fiber wool is the main material used for heat insulation and thermal insulation, and it has excellent heat insulation and thermal insulation effects. The thermal insulation board used for the wall can prevent the "thermal bridge" of the wall reasonably and achieve better thermal insulation effect. 100mm thick R15 thermal insulation material can be equivalent to a 1m thick wall.
The light steel structure is composed of all cold-drawn thick-walled steel components management system, and the anchors are made of very anti-corrosive high-strength cold-rolled galvanized steel plates, which reasonably prevent the danger of rusting of thick steel plates during the whole process of construction and application, and enhance the service life of the light steel structure components. The service life of the structure reaches 100 years.
The wall of light steel structure adopts high efficiency environmental protection and energy saving management system, which has the function of air absorption and can adjust the dryness of indoor air quality; the roof has the function of natural ventilation, which can make the internal air of the house produce liquidity between the gases and ensure the natural ventilation and heat exhaust requirements inside the roof.
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