Differences between I-beams and H-beams

Differences between H-shaped steel and I-beam steel: 1. Whether it is a regular or lightweight type, the I-beam has relatively high and narrow cross-sectional dimensions; as a result, the moments of inertia of its two main flanges differ significantly. Therefore, it can generally only be used in components that are subjected to bending in the plane of its web, or it can be used to form lattice-type structural elements. It is not suitable for axially compressed members or those that also experience bending perpendicular to the web plane, which limits its range of applications significantly. 　 2. H-shaped steel belongs to the category of high-efficiency and economical cross-sectional profiles (others include cold-formed thin-walled steel profiles and profiled steel sheets, etc.). Due to their rational cross-sectional shape, they enable steel to achieve higher efficiency and improve its load-bearing capacity. Unlike ordinary I-beams, the flanges of H-beams are widened, and their inner and outer surfaces are usually parallel, which facilitates connection using high-strength bolts and other components. Its dimensions form a reasonable range with a full selection of models, making it easy to choose for design purposes. 　 3. The flanges of H-shaped steel are of equal thickness; they can have a rolled cross-section or a composite cross-section formed by welding three plates together. I-beams all have rolled cross-sections, and due to poor manufacturing processes, there is a 1:10 slope on the inner side of the flanges. The rolling of H-shaped steel differs from that of ordinary I-beams, which use only a set of horizontal rolls. Due to its wider flanges and lack of slope (or very slight slope), an additional set of vertical rolls is required for rolling as well; therefore, its rolling process and equipment are more complex than those of ordinary rolling mills. The maximum height of rolled H-beams that can be produced domestically is 800 mm; beyond this, only welded composite sections are possible. China’s national standard for hot-rolled H-beams (GB/T11263-1998) classifies H-beams into three categories: narrow flange, wide flange, and steel piles, with codesHZ, HK, and HU respectively. Narrow-flange H-beams are suitable for beams or compression-bending members, while wide-flange H-beams and H-beam piles are suitable for axially compressed members or compression-bending members. Compared to H-beams, for the same weight, w, ix, and iy are all inferior to those of H-beams

On Baidu, one can search for: The differences between H-shaped steel and I-shaped steel. 1. Whether it is ordinary or lightweight, I-shaped steel has relatively high and narrow cross-sectional dimensions; as a result, the moments of inertia of its two main sides of the cross-section differ significantly. Therefore, it can generally only be used in components that are subjected to bending in the plane of their web, or it can be used to form structural components. It is not suitable for axially compressed members or those with bending also in a plane perpendicular to the web, which limits its range of application considerably. 　 2. H-shaped steel belongs to the category of highly efficient and economical cross-sectional profiles (others include cold-formed thin-walled steel profiles and profiled steel sheets, etc.). Due to their rational cross-sectional design, they enable steel to achieve higher efficiency and improved load-bearing capacity. Unlike ordinary I-beams, the flanges of H-beams are widened, and their inner and outer surfaces are usually parallel, which facilitates connection using high-strength bolts and other components. Its dimensions form a reasonable range with a full selection of models, making it easy to choose for design purposes. 　 3. The flanges of H-shaped steel have uniform thickness; they can have a rolled cross-section or a composite cross-section formed by welding three plates together. I-beams all have rolled cross-sections, and due to poor manufacturing processes, there is a 1:10 slope on the inner side of the flanges. The rolling of H-shaped steel differs from that of ordinary I-beams, which use only a set of horizontal rolls. Due to its wider flanges and lack of slope (or very slight slope), an additional set of vertical rolls is required for rolling as well; therefore, its rolling process and equipment are more complex than those of ordinary rolling mills. The maximum height of rolled H-beams that can be produced domestically is 800 mm; beyond this, only welded composite sections are possible. I-beams were formerly known as ordinary I-beams. Due to their relatively narrow flanges, and the curvature at the junction of the web and the bottom plate, the moments of inertia about the two principal axes of the cross-section differ significantly (Ix >> Iy). H-beams, on the other hand, are wide-flange I-beams that have been rolled; compared to ordinary I-beams, their flanges have no slopes on either side and are parallel to each other, which facilitates connection with other structural elements. The flange width b is close to the section height h; therefore, the moments of inertia about the two principal centroid axes of the section are also similar. Although I-beams and H-beams differ only in minor details, those details can often lead to different outcomes. 1 Cross-sectional properties: H-beams have the following advantages: 1) Wide flanges result in high lateral stiffness. The height-to-width ratio of H-beams with wide flanges can be 1 or slightly less than 1, which significantly increases their stiffness about the weak axis; thus they can be used more effectively in compressive members. The flanges of H-beams with narrow flanges are also 1.1 to 1.4 times wider than those of I-beams of the same height, so under the same cross-sectional area, their stiffness about the weak axis is 1 time or more higher. 2) High bending resistance: H-beams have wider flanges and relatively thinner web sections compared to I-beams, and the inner and outer surfaces of their flanges are parallel to each other. Due to the larger proportion of flanges in H-beams, the area distribution of their cross-section is more optimal, which gives them higher bending resistance than I-beams. 3) The two surfaces of the flange are parallel to each other, facilitating construction. The flanges of H-beams are wide and their two surfaces are parallel, which makes construction easier and more straightforward. 4) Processable recycled profiles: H-beams can be easily processed into T-beams and honeycomb beams. 2 Scope of application: Whether they are of the regular or lightweight type, I-beams have relatively high and narrow cross-sectional dimensions; as a result, the moments of inertia of their two main flanges differ significantly. Therefore, they can generally only be used in components that are subjected to bending in the plane of their web, or they can be used to form lattice-type structural elements. Therefore, when used alone, it can only function as a regular bending member or compression member, such as secondary beams or compression columns in work platforms; when used as part of a composite section, it can serve as a primary compression member. 3 Production process: The rolling of H-shaped steel differs from that of ordinary I-beams, which use only a set of horizontal rollers. Due to its wide flanges and lack of slope (or very slight slope), an additional set of vertical rollers must be used for rolling as well. Therefore, its rolling process and equipment are more complex than those of ordinary rolling mills. 4 Classification of H-shaped steel at home and abroad 1) Chinese standards: GB/T11263-98. It is divided into four series: HW, HM, HN, and HP. The HW series consists of wide-flange H-beams, with a cross-sectional height of 100~400 mm ； The HM series are medium-flange H-shaped steel sections with a cross-sectional height of 150~500mm ； The HN series consists of narrow-flange H-beams, with a section height of 100~700 mm ； The HP series are H-shaped steel bars for piles, with a cross-sectional height of 200~400mm. 2) European standards: Euronorm 19 and Euronorm 53 standards. It is divided into four series: IPB, IPBL, IPBV, and IPE. The IPB series are wide-flange H-beams; the IPBL series are lightweight wide-flange H-beams ； The IPBV series are heavy-duty wide-flange H-beams ； The IPE series are H-beams with medium-width flanges. 3) American standards: ASTM A6/A6M standards. It is divided into three series: W, M, and HP. The W series is wide-flange H-beams ； The M series features mid-wing edge H-shaped steel ； The HP series are H-shaped steel bars for piles. 4) British standards: BS4 standard. It is divided into three series: UC column type, UB beam type, and UP pile type. 5) Japanese standards: The JIS G3192 standard applies to beam and column-type H-beams, while the JIS A5526-88 standard applies to pile-type H-beams. 6) Former Soviet Union standards: 26030-83** standard. It is divided into four series: regular H-beams, wide-flange H-beams, pile-type H-beams, and supplementary H-beams. 5 Conclusions In summary, H-shaped steel belongs to the category of efficient and economical cross-sectional profiles (others include cold-formed thin-walled sections and profiled sheets, etc.). Due to their rational cross-sectional design, they enable steel to achieve higher efficiency and improved load-bearing capacity. Unlike ordinary I-beams, the flanges of H-beams are widened. Since the inertial radii in the two principal directions are roughly equal for H-beams with wide flanges, and their inner and outer surfaces are usually parallel, this facilitates connection using high-strength bolts and other components. Its dimensions form a reasonable range with a full selection of models, making it easy to choose for design purposes. Narrow-flange H-beams are suitable for beams or compression-bending members, while wide-flange H-beams and H-beam piles are suitable for axially compressed members or compression-bending members. Therefore, H-shaped steel is a replacement for I-beam steel. However, I-beams are not entirely without advantages. Due to their wall thickness, the flanges increase in size from the outside to the inside, which corresponds to the actual stress conditions within the cross-section. Moreover, there are rounded corners between the flanges and the web, so local instability does not occur under normal use; thus, no additional reinforcement or checks are necessary in the absence of significant concentrated forces.

It’s easy to understand by looking at the structure of these two characters: one with a long ‘wing’ represents H, while one with a short ‘wing’ represents the character for I, right? Of course, the correct explanation for LS has already been clearly stated!

The H-shaped steel has a cost-effective cross-sectional shape and excellent mechanical properties; during rolling, the deformation of various points in the cross-section is relatively uniform, resulting in low internal stresses. Compared with ordinary I-beams, it offers advantages such as a higher section modulus, lower weight, and reduced metal usage. Used in building structures, it can reduce the structure’s weight by 30%-40%. Furthermore, since the inner and outer sides of its legs are parallel and the ends of the legs form right angles, assembling them into components can reduce welding and riveting work by up to 25%. It is commonly used in large structures that require high load-bearing capacity and good cross-sectional stability, such as high-rise buildings and rectangular structures, as well as in bridges, ships, lifting and transportation machinery, mechanical foundations, scaffolds, and foundation piles. The main differences lie in the cross-section and manufacturing processes. Since the manufacturing technology for H-shaped steel in China is now quite mature, it is recommended to use this type of steel due to its structural and mechanical advantages. A recommended literature on alternative I-beams, which provides a very thorough explanation. Comparison of Models and Performance Parameters of Hot-rolled H-beams and I-beams — Wang Limin

H-beam H-beam The H-beam is an economical type of steel section that has been developed as an improved version of the I-beam, offering superior mechanical properties; it is named so because its cross-section resembles the English letter “H”. Its characteristics are as follows: → Wide wing edges, high lateral stiffness. It has strong bending resistance. 　　→ The parallelism of the two surfaces of the flange facilitates connection, processing, and installation. 　　→ Compared to welded I-beams, it has lower costs, higher precision, and less residual stress; it also eliminates the need for expensive welding materials and weld inspection, saving approximately 30% on the costs associated with steel structure fabrication. 　　→ Under the same cross-sectional load, hot-rolled H-shaped steel structures are 15%-20% lighter than traditional timber structures. 　　→ Compared to concrete structures, hot-rolled H-shaped steel structures allow for a 6% increase in usable area, while the structural weight is reduced by 20% to 30%, thereby reducing the internal forces required in structural design. 　　→ H-shaped steel can be processed into T-shaped steel, and honeycomb beams can be combined to form various cross-sectional shapes, thus fully meeting the requirements of engineering design and construction. 　　H-shaped steel is primarily used in engineering projects, factory equipment, mechanical devices, bridges, highways, residential buildings, etc.; it boasts good mechanical and physical properties, is durable, and helps save energy as well as being environmentally friendly. H-shaped steel is a type of economical-section steel that is widely used in industries, construction, bridges, oil drilling platforms, and other fields. It is estimated that China’s demand for H-shaped steel will be around 2.5 million tons in 2005, and 5 million tons by 2010. However, China’s current annual production capacity for H-shaped steel is only 1.2 million tons, meaning there is a very large demand in the market. 　　1. Notation method for hot-rolled H-beams. 　　H-shaped steel is divided into three categories: wide-flange H-shaped steel (HK), narrow-flange H-shaped steel (HZ), and H-shaped steel piles (HU). Its representation is: height H × width B × web thickness t1 × flange thickness t2. For example, H-beam Q235B, SS400 200×200×8×12 denotes an H-beam with a height of 200 mm, a width of 200 mm, a web thickness of 8 mm, and a flange thickness of 12 mm; its grade is either Q235B or SS400. 　　2. Advantages of hot-rolled H-beams H-beams are a new type of economical steel for construction use. 　　The H-shaped steel has a cost-effective cross-sectional shape and excellent mechanical properties; during rolling, the deformation of various points in the cross-section is relatively uniform and internal stresses are low. Compared with ordinary I-beams, it offers advantages such as a higher section modulus, lower weight, and reduced metal usage, enabling building structures to be lighter by 30-40% ； Furthermore, since the inner and outer sides of its legs are parallel and the ends of the legs form right angles, assembling them into components can reduce welding and riveting work by up to 25%. It is commonly used in large buildings that require high load-bearing capacity and good cross-sectional stability (such as factories and high-rise buildings), as well as in bridges, ships, lifting and transportation machinery, equipment foundations, supports, and foundation piles. 　　Currently, in China, the main steel producers include MaSteel Company in Ma’anshan City, Anhui Province, Laiwu Iron and Steel Co., Ltd., Rizhao Iron and Steel, Jinxi Iron and Steel, and Changzhi Iron and Steel. Magang was the first enterprise in China to produce H-beams. 　　On September 1, 2005, the China Famous Brand Strategy Promotion Committee, authorized by the General Administration of Quality Supervision, Inspection and Quarantine, officially designated the hot-rolled H-beams produced by Ma’anshan Iron and Steel Group Corporation (abbreviated as MAISC) as Chinese famous brand products. Differences between I-beams, HW, HM, and H-shaped beams: The flanges of I-beams have a varying thickness, being thicker near the web and thinner on the outside; whereas the flanges of H-shaped beams have a constant thickness. HW, HM, and HN are general terms for H-shaped beams, with H-shaped beams being welded together, while HW, HM, and HN are produced through hot rolling. In the case of HW, the height of the H-shaped beam is roughly equal to its flange width; it is mainly used as steel core columns in reinforced concrete frame structures, also known as rigid steel columns. In steel structures, it is primarily used for columns. For HM, the ratio of the height to the flange width is approximately 1.33–1.75; it is mainly used in steel structures as columns in steel frames, as well as as frame beams in structures subjected to dynamic loads, such as equipment platforms. For HN, the ratio of the height to the flange width is 2 or more; it is mainly used for beams. The applications of I-beams are similar to those of HN-type beams. 1. Whether they are ordinary or lightweight, I-beams have relatively high and narrow cross-sectional dimensions, resulting in significant differences in the moments of inertia of their two main axes. Therefore, they can generally only be used in components that are subjected to bending within the plane of their web, or they can be used to form lattice-type structural elements. It is not suitable for axially compressed members or those that also experience bending perpendicular to the web plane, which limits its range of applications significantly. 　 　　2. H-shaped steel belongs to the category of high-efficiency and economical cross-sectional profiles (others include cold-formed thin-walled steel profiles and profiled steel sheets, etc.). Due to their rational cross-sectional shape, they enable steel to achieve higher efficiency and improve its load-bearing capacity. Unlike ordinary I-beams, the flanges of H-beams are widened, and their inner and outer surfaces are usually parallel, which facilitates connection using high-strength bolts and other components. Its dimensions form a reasonable range with a full selection of models, making it easy to choose for design purposes. 　 　　3. The flanges of H-beams have uniform thickness; they can have a rolled cross-section or a composite cross-section formed by welding three plates together. I-beams all have rolled cross-sections, and due to poor manufacturing processes, there is a 1:10 slope on the inner side of the flanges. The rolling of H-shaped steel differs from that of ordinary I-beams, which use only a set of horizontal rolls. Due to its wider flanges and lack of slope (or very slight slope), an additional set of vertical rolls is required for rolling as well; therefore, its rolling process and equipment are more complex than those of ordinary rolling mills. The maximum height of rolled H-beams that can be produced domestically is 800 mm; beyond this, only welded composite sections are possible. 　　China’s national standard for hot-rolled H-beams (GB/T11263-1998) classifies H-beams into three categories: narrow flange, wide flange, and steel piles, with codesHZ, HK, and HU respectively. Narrow-flange H-beams are suitable for beams or compression-bending members, while wide-flange H-beams and H-beam piles are suitable for axially compressed members or compression-bending members. Compared to H-beams, for the same weight, w, ix, and iy are all inferior to those of H-beams