H-shaped steel is divided into two types: hot-rolled H-shaped steel and welded H-shaped steel (H). Hot-rolled H-shaped steel is further divided into wide-flange H-shaped steel (HW), medium-flange H-shaped steel (HM) and narrow-flange H-shaped steel (HN). Three types.
HW is an H-shaped steel whose height and flange width are basically equal; it is mainly used for steel core columns in reinforced concrete frame structure columns, also called stiff steel columns; it is mainly used for columns in steel structures.
HM is the ratio of H-shaped steel height to flange width, which is roughly 1.33~~1.75. Mainly used in steel structures: used as steel frame columns and frame beams in frame structures that bear dynamic loads; for example: equipment platforms
HN is an H-shaped steel with a height and flange width ratio greater than or equal to 2, mainly used for beams; the use of I-shaped steel is equivalent to HN-shaped steel;
The main materials of H-shaped steel are Q235B, SM490, SS400, Q345, Q345B, etc.
H-shaped steel is mainly used as beam and column components in industrial and civil structures.
◆Steel structure load-bearing brackets for industrial structures
◆Steel piles and supporting structures for underground projects
◆Petrochemical, electric power and other industrial equipment structures
◆Long-span steel bridge components
◆Frame structure for shipbuilding and machinery manufacturing
◆Girder supports for trains, cars and tractors
◆Port conveyor belt, high-speed baffle bracket
H-shaped steel is an economical cross-section steel that is widely used in industry, construction, bridges, oil drilling platforms, etc. It is predicted that my country's demand for H-shaped steel will be about 2.5 million tons in 2005 and 5 million tons in 2010. However, currently my country The annual production capacity of H-shaped steel is 1.2 million tons, and the market demand is very huge.
1. High structural strength
Compared with I-beam, the section modulus is larger, and 10-15% of metal can be saved under the same load-bearing conditions.
2. Flexible and rich design style
When the beam height is the same, the bays of the steel structure can be 50% larger than those of the concrete structure, making the building layout more flexible.
3. The structure is light in weight
It is lighter than the self-weight of a concrete structure. The reduction of the structure's self-weight reduces the internal force of the structural design, which can make the building structure foundation processing requirements lower, the construction is simple, and the cost is reduced.
4. High structural stability
.The steel structure mainly made of hot-rolled H-shaped steel has a scientific and reasonable structure, good plasticity and flexibility, and high structural stability. It is suitable for building structures that can withstand large vibration and impact loads. It has strong resistance to natural disasters and is especially suitable for some Building structures in earthquake prone areas. According to statistics, when a devastating earthquake of magnitude 7 or above occurs in the world, steel structure buildings dominated by H-shaped steel suffer the least damage.
5. Increase the effective use area of the structure
Compared with concrete structures, the cross-sectional area of steel structure columns is small, which can increase the effective use area of the building. Depending on the different forms of the building, the effective use area can be increased by 4-6%.
