Building material H section steel

H-beam steel is an economical and efficient profile with more optimized section area distribution and more reasonable strength-to-weight ratio, so it is named because its section is the same as the English letter "H". Because all parts of H beam are arranged at right angles, H beam has been widely used for its advantages of strong bending resistance, simple construction, cost saving and light structural weight in all directions.

Characteristic

The inner and outer flanges of H-beams are parallel or nearly parallel, and the ends of the flanges are at right angles, hence the name parallel flanged I-beams. The thickness of the web of H-beam is smaller than that of ordinary I-beams with the same height of the web, and the width of the flange is larger than that of ordinary I-beams with the same height of the web, so it is also named wide rim I-beams. Determined by the shape, the section modulus, moment of inertia and corresponding strength of H-beam are obviously better than that of ordinary I-beam with the same single weight. Used in different requirements of the metal structure, whether under bending moment, pressure load, eccentric load show its superior performance, can greatly improve the bearing capacity than ordinary I-steel, metal saving 10% ~ 40%. H beam has wide flange, thin web, many specifications and flexible use, which can save 15% ~ 20% metal in various truss structures. Because the flange is parallel inside and outside, and the edge end is at a right Angle, it is easy to assemble and combine into various components, which can save about 25% of the welding and riveting work, and greatly accelerate the construction speed of the project and shorten the construction period.

Use

Due to the above advantages, H beam is widely used in: various civil and industrial building structures; A variety of long-span industrial plants and modern high-rise buildings, especially in areas with frequent seismic activity and high temperature working conditions; Large Bridges with large bearing capacity, good cross-section stability and large span are required; Heavy equipment; A highway; Ship skeleton; Mine support; Foundation treatment and dam engineering; Various machine components.

Classification

There are many product specifications of H beam, and the classification methods are as follows. (1) According to the flange width of the product, it can be divided into wide flange, middle flange and narrow flange H-beams. Flange width B of wide and middle flange H-beams is greater than or equal to web height H. The flange width B of the narrow flange H-beam is equal to about half of the height H of the web. (2) According to the use of the product, it is divided into H-type steel beam, H-type steel column, H-type steel pile, H-type steel beam with very thick flange. Sometimes parallel leg channels and parallel flange T-bars are also included in the scope of H beam. Generally, narrow flange H-beam steel is used as beam material and wide flange H-beam is used as column material. Therefore, it is also known as beam H-beam and column H-beam. (3) According to the production mode, it can be divided into welded H-beam and rolled H-beam. (4) According to the size specification, it is divided into large, medium and small H-beam steel. Usually the web height H above 700mm products called large, 300 ~ 700mm called medium, less than 300mm called trumpet. By the end of 1990, the largest H-beam in the world had a web height of 1200mm and flange width of 530mm.

Internationally, H beam steel product standards are divided into British system and metric system two categories. The United States, the United Kingdom and other countries adopt the British system, and China, Japan, Germany and Russia and other countries adopt the metric system. Although the British system and the metric system use different units of measurement, most H-beam steel uses four dimensions to express their specifications, namely: web height H, flange width b, web thickness d and flange thickness t. Although countries around the world have different ways of expressing the size and size of H-beam steel. But the product size specification range and size tolerance are not different.