Application of straight sleeve
Straight sleeve is an economical section and high-efficiency section with more optimized cross-sectional area distribution and more reasonable strength-to-weight ratio. It is named because its section is the same as the English letter "H". Since the various parts of the straight sleeve are arranged at right angles, the straight sleeve has the advantages of strong bending resistance, simple construction, cost saving and light structure in all directions, and has been widely used. An economical cross-section profile with a cross-sectional shape similar to the capital Latin letter H, also called universal steel beam, wide edge (side) I-beam or parallel flange I-beam. The cross section of a straight sleeve usually includes two parts, a web and a flange, which are also called waist and sides.
The inner and outer sides of the flange of a straight sleeve are parallel or close to parallel, and the flange ends are at right angles, hence the name parallel flange I-beam. The thickness of the web of a straight sleeve is smaller than that of the ordinary I-beam with the same height of the web, and the flange width is larger than that of the ordinary I-beam with the same height of the web, so it is also named the wide-edge I-beam. Determined by the shape, the section modulus, moment of inertia and corresponding strength of the straight sleeve are significantly better than ordinary I-beams of the same single weight. Used in metal structures with different requirements, whether it bears bending moment, pressure load, or eccentric load, it shows its superior performance. Compared with ordinary I-beam, it can greatly increase the load-bearing capacity and save metal by 10%-40%. The straight sleeve has wide flanges, thin webs, multiple specifications, and flexible use. It can save 15%-20% of metal when used in various truss structures. Because the flanges are parallel inside and outside, and the edges are at right angles, it is easy to assemble and assemble various components, which can save about 25% of the welding and riveting workload, which can greatly accelerate the construction speed of the project and shorten the construction period.
Because of the above advantages, the straight sleeve is widely used, mainly for: various civil and industrial building structures; various large-span industrial plants and modern high-rise buildings, especially industrial plants in areas with frequent seismic activities and high-temperature working conditions; requirements Large-scale bridges with large bearing capacity, good cross-section stability and large spans; heavy equipment; highways; ship skeletons; mine supports; foundation treatment and dam engineering; various mechanical components.
There are many specifications of straight sleeve products, and the classification methods are as follows. (1) According to the flange width of the product, it is divided into wide flange, middle flange and narrow flange H-shaped steel. The flange width B of the wide flange and the middle flange straight sleeve is greater than or equal to the web height H. The width B of the flange of a narrow flange straight sleeve is approximately equal to one-half of the height H of the web. (2) Divided into H-shaped steel beams, H-shaped steel columns, straight sleeves, and extremely thick flange H-shaped steel beams according to product usage. Sometimes parallel leg channel steel and parallel flange T-shaped steel are also included in the scope of the straight sleeve. Generally, narrow flange H-shaped steel is used as beam material, and wide flange straight sleeve is used as column material. According to this, it is also called beam-type straight sleeve and column-type H-shaped steel.