I-steel beam cross section is also called, is an H-shaped strip steel. I-steel divides ordinary I-beam and light steel, H steel three. The I-shaped steel is widely used in various building structures, bridges, vehicles, bracket, machinery etc..
The reason of ordinary I-beam wing root and light I-beam to the edge of the progressively thinner, has a certain angle, the ordinary I-beam and light I-beam model is the Arabia digital with the waist high cm number to represent, web, flange thickness and width of flange to the different specifications to waist high (H) x width (leg b) * waist thickness (d) without number representation, such as "general 160 x 88 x 6", namely said waist high of 160 mm 88 mm in width, legs, waist thickness of 6 mm is ordinary i-beam. "Light 160 x 81 x 5", namely said waist height 160 mm, leg width of 81 mm, light I-beam waist thickness is 5 mm. Ordinary I-beam specifications are available models said type representation of waist high cm number, such as general 16#. Waist high same I-steel, if there are several different wide legs and waist thick, need to add a B C to be the difference in the types of the right, such as general 32#a, 32#b, 32#c etc.. Hot rolled ordinary I-beam specifications for 10-63#. Hot rolled ordinary I-beam specifications of both sides of supply and demand supply for 12-55# protocol.
I-beam are divided into ordinary steel, light I-beam and H type steel three.
Ordinary I-beam, light I-beam flanges is variable cross-section by web thickness, external thin; H type steel: HW HM HN HEA HEB flange HEM I-beam is uniform.
Ordinary I-beam, light I-beam has formed the national standard, the common 10# I-beam equivalent to the international I100 (for example, 10# channel is equivalent to the channel (U100) for countries to implement different standards, resulting in subtle differences in their specifications)
H sections are also called the wide flange steel, HW HM HN derived from the European standard, HEB is the German standard I-beam, where HW, HN I-steel has been widely used in our country and production. HEA HEB HEM seen in many German design will, in the domestic market is also very difficult to buy. In the domestic steel structure engineering, if less, you can use the other specifications of steel plate welding assembled. But if a large quantity of, usually consider the use of mechanical properties and equivalent HW, HN type steel instead of.
HW I-beam is mainly used for reinforced concrete frame column steel column, also known as reinforced steel column; in the steel structure is mainly used for the column
HM type steel height and width of flange is roughly 1.33~~1.75 used for steel frame columns in frame structure under dynamic load is used for the main frame beam in steel structure; for example: equipment platform
HN type steel height and flange width ratio is greater than or equal to 2; mainly used for beam
Use ordinary I-beam equivalent to HN steel;
The I-shaped steel whether ordinary or light, because the section size are relatively high, narrow, so the moment of inertia of the cross-section of two main sleeve difference, therefore, the general can only be used directly in the web plane bending component or its component lattice stress components. The axial compression member or in the perpendicular to the web plane and curved components are not used, thus in their application range is limited.
The H steel is efficient and economic cutting surface profile (there are other cold-formed steel, steel etc.), owing to the section shape is reasonable, they can make the steel higher effectiveness, improve the bearing capacity. Different from the ordinary I-shaped flange type H steel were widened, and the inner, outer surface is generally parallel, which can facilitate the connection with high strength bolts and other components. Its size to form a series of reasonable, model complete, easy to use design.
The scope of application
Ordinary I-beam, light I-beam, because the section size are relatively high, narrow, so the moment of inertia of the cross-section of two main sleeve difference, therefore, the general can only be used directly in the web plane bending component or its component lattice stress components. The axial compression member or in the perpendicular to the web plane and curved components are not used, thus in their application range is limited. The I-steel should be based on the requirements of design drawings for choice.
