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Structural steel
Structural steel
Structural steel
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Structural steel

Structural steel is steel used for making construction materials in a variety of shapes. Many structural steel shapes take the form of an elongated beam having a profile of a specific cross section. Structural steel shapes, sizes, chemical composition, mechanical properties such as strengths, storage practices, etc., are regulated by standards in most industrialized countries.

Structural steel shapes, such as I-beams, have high second moments of area, so can support a high load without excessive sagging.[1]

Structural steel roof at Manchester Victoria Station

Structural shapes

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The shapes available are described in published standards worldwide, and specialist, proprietary cross sections are also available.[citation needed]

A steel I-beam used to support timber joists
  • I-beam (serif capital 'I'-shaped cross-section – in Britain these include Universal Beams (UB) and Universal Columns (UC); in Europe it includes the IPE, HE, HL, HD and other sections; in the US it includes Wide Flange (WF or W-Shape) and H sections)[citation needed]
  • Z-Shape (half a flange in opposite directions)[2]
  • HSS-Shape (Hollow structural section also known as SHS (structural hollow section) and including square, rectangular, circular (pipe) and elliptical cross sections)
  • Angle (L-shaped cross-section)
  • Structural channel, C-beam, or 'C' cross-section
  • Tee (T-shaped cross-section)[citation needed]
  • Bar, with a rectangular cross section, but not so wide so as to be called a sheet.
  • Rod, a round or square section long compared to its width.
  • Plate, metal sheets thicker than 6 mm or 1⁄4 in.
  • Open web steel joist

Sections can be hot or cold rolled, or fabricated by welding together flat or bent plates.[3]

The terms angle iron, channel iron, and sheet iron have been in common use since before wrought iron was replaced by steel for commercial purposes and are still sometimes used informally. In technical writing angle stock, channel stock, and sheet are used instead of those misnomers.[citation needed]

Standards

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Europe

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Most steels used in Europe are specified to comply with EN 10025. However, some national standards remain in force.[4] Example grades are S275J2 or S355K2W where S denotes structural steel; 275 or 355 denotes the yield strength in newtons per square millimetre or the equivalent megapascals; J2 or K2 denotes the material's toughness by Charpy impact test values, and the W denotes weathering steel. Further letters can be used to designate fine grain steel (N or NL); quenched and tempered steel (Q or QL); and thermomechanically rolled steel (M or ML).[citation needed]

Common yield strengths available are 195, 235, 275, 355, 420, and 460, although some grades are more commonly used than others. In the UK, almost all structural steel is S275 and S355. Higher grades such as 500, 550, 620, 690, 890 and 960 available in quenched and tempered material although grades above 690 receive little if any use in construction at present.[citation needed]

Euronorms define the shape of standard structural profiles:

US

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Steels used for building construction in the US use standard alloys identified and specified by ASTM International. These steels have an alloy identification beginning with A and then two, three, or four numbers. The four-number AISI steel grades commonly used for mechanical engineering, machines, and vehicles are a completely different specification series.

The standard commonly used structural steels are:[5]

Carbon steels

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  • A36 – structural shapes and plate.
  • A53 – structural pipe and tubing.
  • A500 – structural pipe and tubing.
  • A501 – structural pipe and tubing.
  • A529 – structural shapes and plate.
  • A1085 – structural pipe and tubing.

High strength low alloy steels

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  • A441 – structural shapes and plates (Superseded by A572)
  • A572 – structural shapes and plates.
  • A618 – structural pipe and tubing.
  • A992 – Possible applications are W or S I-Beams.
  • A913 – Quenched and Self Tempered (QST) W shapes.
  • A270 – structural shapes and plates.

Corrosion resistant high strength low alloy steels

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  • A243 – structural shapes and plates.
  • A588 – structural shapes and plates.

Quenched and tempered alloy steels

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  • A514 – structural shapes and plates.
  • A517 – boilers and pressure vessels.
  • Eglin steel – Inexpensive aerospace and weaponry items.

Forged steel

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  • A668 – Steel Forgings
Non-preload bolt assembly (EN 15048)
Pre-load bolt assembly (EN 14399)

CE marking

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The concept of CE marking for all construction products and steel products is introduced by the Construction Products Directive (CPD). The CPD is a European Directive that ensures the free movement of all construction products within the European Union.

Because steel components are "safety critical", CE Marking is not allowed unless the Factory Production Control (FPC) system under which they are produced has been assessed by a suitable certification body that has been approved to the European Commission.[6]

In the case of steel products such as sections, bolts and fabricated steelwork the CE Marking demonstrates that the product complies with the relevant harmonized standard.[7]

For steel structures the main harmonized standards are:

  • Steel sections and plate – EN 10025-1
  • Hollow sections – EN 10219-1 and EN 10210-1
  • Pre-loadable bolts – EN 14399-1
  • Non-preloadable bolts – EN 15048-1
  • Fabricated steel – EN 1090 −1

The standard that covers CE Marking of structural steelwork is EN 1090-1. The standard has come into force in late 2010. After a transition period of two years, CE Marking will become mandatory in most European Countries sometime early in 2012.[8] The official end date of the transition period is July 1, 2014

Design considerations

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Steel is sold by weight so the design must be as light as possible whilst being structurally safe. Utilizing multiple, identical steel members can be cheaper than unique components.[9]

Reinforced concrete and structural steel can be sustainable[10] if used properly. Over 80% of structural steel members are fabricated from recycled metals, called A992 steel. This member material is cheaper and has a higher strength to weight ratio than previously used steel members (A36 grade).[11]

Special considerations must be taken into account with structural steel to ensure it is not under a dangerous fire hazard condition.[12]

Structural steel cannot be exposed to the environment without suitable protection, because any moisture, or contact with water, will cause oxidisation to occur, compromising the structural integrity of the building and endangering occupants and neighbors.[12]

Having high strength, stiffness, toughness, and ductile properties, structural steel is one of the most commonly used materials in commercial and industrial building construction.[13]

Structural steel can be developed into nearly any shape, which are either bolted or welded together in construction. Structural steel can be erected as soon as the materials are delivered on site, whereas concrete must be cured at least 1–2 weeks after pouring before construction can continue, making steel a schedule-friendly construction material.[12]

Steel is inherently a noncombustible material. However, when heated to temperatures seen in a fire, the strength and stiffness of the material is significantly reduced. The International Building Code requires steel be enveloped in sufficient fire-resistant materials, increasing overall cost of steel structure buildings.[13]

Steel, when in contact with water, can corrode, creating a potentially dangerous structure. Measures must be taken in structural steel construction to prevent any lifetime corrosion. The steel can be painted, providing water resistance. Also, the fire resistance material used to envelope steel is commonly water resistant.[12]

Steel provides a less suitable surface environment for mold to grow than wood.[14]

Tall structures are constructed using structural steel due to its constructability, as well as its high strength-to-weight ratio.[15]

Metal deck and open web steel joist receiving spray fireproofing plaster, made of polystyrene-leavened gypsum

Steel loses strength when heated sufficiently. The critical temperature of a steel member is the temperature at which it cannot safely support its load [citation needed]. Building codes and structural engineering standard practice defines different critical temperatures depending on the structural element type, configuration, orientation, and loading characteristics. The critical temperature is often considered the temperature at which its yield stress has been reduced to 60% of the room temperature yield stress.[16] In order to determine the fire resistance rating of a steel member, accepted calculations practice can be used,[17] or a fire test can be performed, the critical temperature of which is set by the standard accepted to the Authority Having Jurisdiction, such as a building code. In Japan, this is below 400 °C.[18] In China, Europe and North America (e.g., ASTM E-119), this is approximately 1000–1300 °F[19] (530–810 °C). The time it takes for the steel element that is being tested to reach the temperature set by the test standard determines the duration of the fire-resistance rating. Heat transfer to the steel can be slowed by the use of fireproofing materials, thus limiting steel temperature. Common fireproofing methods for structural steel include intumescent, endothermic, and plaster coatings as well as drywall, calcium silicate cladding, and mineral wool insulating blankets.[20]

Structural steel fireproofing materials include intumescent, endothermic and plaster coatings as well as drywall, calcium silicate cladding, and mineral or high temperature insulation wool blankets. Attention is given to connections, as the thermal expansion of structural elements can compromise fire-resistance rated assemblies.

Manufacturing

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Cutting workpieces to length is usually done with a bandsaw.[citation needed]

A beam drill line drills holes and mills slots into beams, channels and HSS elements. CNC beam drill lines are typically equipped with feed conveyors and position sensors to move the element into position for drilling, plus probing capability to determine the precise location where the hole or slot is to be cut.[citation needed]

For cutting irregular openings or non-uniform ends on dimensional (non-plate) elements, a cutting torch is typically used. Oxy-fuel torches are the most common technology and range from simple hand-held torches to automated CNC coping machines that move the torch head around the structural element in accordance with cutting instructions programmed into the machine.[citation needed]

Fabricating flat plate is performed on a plate processing center where the plate is laid flat on a stationary 'table' and different cutting heads traverse the plate from a gantry-style arm or "bridge". The cutting heads can include a punch, drill or torch.[citation needed]

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Structural steel

View on Grokipedia
from Grokipedia
Structural steel is a versatile consisting of hot-rolled shapes and plates, such as wide-flange beams, channels, angles, and hollow structural sections, manufactured to standardized specifications for use in load-bearing frameworks of buildings, bridges, and industrial structures. It is engineered for high strength, , and predictability under load, with common grades like ASTM A36 offering a minimum yield strength of 250 MPa and of 400-550 MPa, making it suitable for withstanding tension, compression, and bending forces in demanding environments. Higher-strength variants, such as ASTM A572 Grade 50, provide yield strengths up to 345 MPa for applications requiring greater load capacity with reduced weight. Key properties of structural steel derive from its —typically 0.05-0.25% carbon, along with , , , and —and processes like hot-rolling, which enhance , , and resistance when protected. These attributes enable efficient fabrication off-site, reducing construction time and costs compared to alternatives like , while its high strength-to-weight ratio allows for longer spans and lighter overall structures. In the United States, structural steel production exceeded 6 million tons of hot-rolled shapes in —as of recent years, annual production capacity exceeds 9 million tons, with approximately 3.5 million tons used in new buildings—supporting a $20 billion industry as of that employed over 200,000 workers across thousands of firms. Beyond mechanical performance, structural steel stands out for its sustainability: it contains over 93% recycled content on average and boasts a 98% rate, far surpassing many other building materials, which minimizes environmental impact throughout its lifecycle. Standards from bodies like the American Institute of Steel Construction (AISC) and govern its design, fabrication, and erection, ensuring compliance with load and resistance factor design (LRFD) or allowable strength design (ASD) methods to meet seismic, , and requirements. Applications span commercial high-rises, where it forms the primary framing system, to infrastructure like bridges and arenas, often enhanced with coatings or for longevity and safety.

Overview and Properties

Definition and Composition

Structural steel is a versatile material primarily composed of iron and carbon, designed specifically for use in load-bearing structural members such as beams, columns, and trusses in buildings and . It is typically produced through hot-rolling processes to form standard cross-sectional shapes, offering a balance of strength, , and economy that makes it ideal for applications. Unlike other s used for tools or machinery, structural steel is categorized as low-carbon or mild steel to ensure sufficient formability and during fabrication. The base element of structural steel is iron, with carbon content typically up to 0.25% by weight, with maximums around 0.30% in some grades, which provides the necessary strength while maintaining essential for shaping and impact resistance. is added at levels between 0.50% and 1.70% to enhance tensile strength and support hot-working processes without excessive . , limited to less than 0.55%, acts as a deoxidizer during , refining the microstructure and improving overall . Trace elements like and are strictly controlled to under 0.04% to 0.05% each, as higher levels can cause and reduce . Structural steel primarily falls into two alloying categories: carbon steels, which rely mainly on iron, carbon, and for their properties, and low-alloy steels such as high-strength low-alloy (HSLA) variants that incorporate small amounts of elements like , , or to boost strength without significantly increasing carbon content. High-strength quenched and tempered steels represent a further variation, using treatments alongside alloying for enhanced performance in demanding applications. These variations allow tailoring of the material to specific structural needs while adhering to general composition principles. The directly influences and formability; low carbon and minimal phosphorus and sulfur levels prevent cracking in the during and promote easier bending or rolling without fracture. For instance, the value, derived from the proportions of carbon, , and other alloys, is a key metric used to predict and ensure good in structural applications. This compositional foundation also underpins the mechanical properties, such as yield strength and elongation, observed in subsequent performance evaluations.

Mechanical and Physical Properties

Structural steel exhibits a range of mechanical properties that determine its suitability for load-bearing applications, primarily governed by its carbon content and alloying elements. The yield strength, which marks the onset of deformation, typically ranges from MPa for common grades like S235 to 355 MPa for higher-strength grades like S355, as specified in European standards. , the maximum stress before fracture, generally falls between 400 MPa and 550 MPa for these grades, providing a measure of the material's capacity to withstand pulling forces. is quantified by elongation at break, often 20-30%, allowing the steel to deform significantly without fracturing, which is crucial for energy absorption in structures. , assessed via Charpy V-notch impact testing, ensures resistance to brittle failure under dynamic loads, with minimum values of 27 J at 20°C for S235 . Physical properties of structural steel are relatively consistent across grades, influencing its behavior under various environmental conditions. The density is approximately 7850 kg/m³, providing a balance between strength and weight for efficient structural design. The modulus of elasticity, or , is 210 GPa, indicating the stiffness of the material in the elastic range. , a measure of relative to axial strain, is 0.3, reflecting the material's volumetric response to uniaxial loading. The coefficient of linear is 12 × 10^{-6} /°C, which accounts for dimensional changes with temperature variations in service. In the elastic regime, the stress-strain relationship follows , expressed as: σ=Eε\sigma = E \varepsilon where σ\sigma is the normal stress, EE is the modulus of elasticity, and ε\varepsilon is the normal strain; this linear behavior holds up to the yield point, beyond which deformation occurs. resistance enables structural steel to endure cyclic loading without failure, with all common grades exhibiting equivalent performance categorized under AASHTO fatigue provisions for bridge applications, typically providing a fatigue threshold for infinite life (>2 million cycles) at stress ranges around 110-140 MPa depending on detail configuration. , measured on the Brinell scale, is typically around 120-140 HB for mild structural steels, correlating with tensile strength and providing a quick indicator of wear resistance. Heat treatment processes significantly alter these properties to meet specific performance needs; for instance, involves heating to 800-900°C followed by slow cooling, which refines the microstructure, reduces internal stresses, and enhances by increasing elongation while lowering yield strength. This treatment is particularly beneficial for improving formability in cold-worked steels without compromising overall toughness.

History and Development

Early Origins

The invention of the in 1856 by British engineer marked a pivotal advancement in production, allowing for the mass manufacturing of low-carbon by blowing air through molten to remove impurities like carbon, silicon, and . This method dramatically increased output and reduced costs compared to previous or techniques, enabling to emerge as a viable structural material for large-scale . Prior to this, structural applications relied heavily on , which was brittle under tension, or , which was labor-intensive to produce in quantity. In the 1860s and 1870s, structural steel began replacing in bridges and early high-rise buildings, addressing the limitations of these older materials. One of the earliest major applications was the in , completed in 1874, which utilized Bessemer steel for its arches and represented the first significant use of steel in a major bridge structure spanning the . By the late 1870s, projects like the original Tay Rail Bridge in (opened 1878), though primarily using , exemplified the transitional period where steel's superior strength-to-weight ratio started influencing designs to supplant components. In building construction, the in (1885) became the first to incorporate a structural steel frame, supporting its 10 stories and setting the stage for vertical urban growth. Key milestones in the late highlighted steel's growing role, even as precursors like persisted in iconic projects. The , completed in 1889 for the Paris Exposition, employed over 7,000 tons of puddled in its lattice design, serving as a precursor to fully frameworks by demonstrating modular techniques adaptable to . Concurrently, the transition to rolled beams accelerated around the 1880s, with manufacturers like Andrew Carnegie's steelworks producing standardized I-beams that facilitated easier assembly and greater spans in . The adoption of the open-hearth process in the 1880s and 1890s further refined quality by better controlling impurities like , improving for structural use. However, early adoption faced challenges from material inconsistencies; initial Bessemer often suffered from brittleness due to residual content, particularly when using certain iron ores, which compromised under stress. This vulnerability contributed to failures like the Ashtabula River railroad bridge collapse in (1876), where elements fractured brittlely under load, killing nearly 100 and underscoring the need for reliable alternatives. Economic factors propelled steel's widespread adoption, as production efficiencies slashed prices from approximately $100 per ton in the early to under $30 per ton by 1900. This cost decline, driven by Bessemer converters and later open-hearth refinements, made steel competitive with iron and fueled its integration into , from railroads to urban buildings, transforming 19th-century engineering.

Modern Advancements

Following , the development of high-strength low-alloy (HSLA) steels emerged as a significant advancement, enabling lighter and more efficient structural designs by incorporating microalloying elements to enhance strength without excessive weight. These steels gained popularity in the and , particularly in applications like automotive and , where their improved yield strength—often exceeding 350 MPa—allowed for reduced material usage in load-bearing elements. Concurrently, weathering steels such as COR-TEN, introduced by the Steel Corporation in 1933 for corrosion-resistant applications, saw widespread adoption in the for bridges and buildings due to their ability to form a protective , minimizing maintenance needs. The integration of (CAD) in the 1980s revolutionized structural steel engineering, facilitating the creation of complex geometries and optimizing material distribution for enhanced performance. By the late 1980s, CAD systems enabled precise modeling of steel connections and load paths, reducing design errors and accelerating fabrication for projects involving intricate trusses and frames. In recent years up to 2025, sustainable production methods have advanced through the increased use of , which recycle scrap steel and emit approximately 75% less CO2 compared to traditional routes, supporting greener supply chains. Hybrid steel-concrete systems have also progressed, with innovations like steel-concrete-FRP composites demonstrating 35-45% greater stiffness than conventional setups, ideal for tall buildings and bridges in seismic zones. Landmark projects, such as the completed in 2010, utilized approximately 39,000 tonnes of steel rebar overall, including high-strength grades in its and outriggers to achieve unprecedented height while managing wind and gravitational loads. Post-1990s earthquakes, including the 1994 Northridge event, prompted enhanced seismic-resistant designs in steel structures, incorporating ductile moment-resisting frames and braced systems per updated AISC provisions to better dissipate energy. Looking toward 2050, industry trends emphasize net-zero emissions goals, with major producers like pledging to achieve this through expanded EAF use and other low-carbon technologies, increasing reliance on recycled scrap in production. AI-optimized alloys are emerging to fine-tune compositions for minimal environmental impact, accelerating the shift to low-carbon through predictive modeling of properties like resistance and strength.

Standards and Specifications

European and International Standards

In Europe, structural steel is primarily governed by the EN 10025 series of standards, which specify technical delivery conditions for hot-rolled products intended for structural use. Originally published in 2004, the series was comprehensively updated in 2019 to incorporate advancements in material performance and testing requirements. These standards define grades ranging from S235 to S460, where the numerical designation indicates the minimum yield strength in megapascals for thicknesses up to 16 mm; for instance, S235 requires a minimum yield of 235 MPa, while S460 demands 460 MPa. They also mandate impact toughness values, such as 27 joules at temperatures down to -50°C for certain sub-grades, ensuring suitability for cold climates and dynamic loading. Under the European Union's Construction Products Regulation (CPR) 305/2011, structural steel products must bear to demonstrate with essential performance characteristics for safety and durability in . This requires manufacturers to conduct assessments, including factory production control and third-party verification, for structural components like plates, sections, and bars placed on the market. The confirms compliance with harmonized standards such as and for fabricated steelwork, facilitating free movement within the . Internationally, ISO 630 provides a framework for structural steels, specifying yield strength classes from 235 MPa to 460 MPa across various product forms like plates and sections. This standard outlines general technical delivery conditions for hot-rolled products and aligns closely with European practices, supporting harmonization with design codes such as the for global applications. For example, ISO 630-2 covers non-alloy steels with improved atmospheric corrosion resistance, mirroring provisions. Specialized grades within these standards address environmental challenges, such as S355J2W, a that enhances resistance through the addition of approximately 0.5% , forming a protective layer in atmospheric exposure. Defined in EN 10025-5, this grade maintains a minimum yield strength of 355 MPa and is suitable for bridges and outdoor structures without additional coatings. Quality assurance in these standards relies on rigorous testing protocols, including per EN 10002-1, which measures yield strength, , and elongation at ambient temperatures. Chemical composition limits are strictly controlled, with carbon content capped at ≤0.20% for many non-alloy grades to ensure and . These tests verify compliance with specified mechanical properties and elemental restrictions, such as and levels below 0.035%.

North American Standards

In , structural steel standards are primarily governed by the American Society for Testing and Materials (ASTM) for material specifications and the American Institute of Steel Construction (AISC) for design provisions, with the Canadian Standards Association (CSA) providing complementary metrics-based equivalents. These standards ensure consistency in composition, mechanical properties, and performance for applications in buildings, bridges, and other . The ASTM A36 specification covers carbon structural steel shapes, plates, and bars with a minimum yield strength of 36 (250 MPa), suitable for general riveted, bolted, or welded in bridges and buildings. For higher-strength needs, ASTM A572 defines high-strength low-alloy (HSLA) columbium-vanadium structural steel in grades ranging from 42 to 65 yield strength, offering improved strength-to-weight ratios for plates, shapes, and bars. ASTM A588 specifies weathering HSLA steel with enhanced atmospheric resistance, maintaining a 50 minimum yield strength, which develops a protective for exposed structures like bridges. For demanding applications requiring exceptional toughness, ASTM A514 outlines quenched and tempered plates with yield strengths up to 100 (690 MPa), used in welded structures such as heavy machinery and offshore platforms. The AISC Specification for Structural Steel Buildings, in its 2022 edition (ANSI/AISC 360-22), provides comprehensive rules incorporating these ASTM materials, including provisions for wide-flange beams under load and resistance factor design or allowable strength design methods, with dedicated sections on fatigue resistance and to ensure long-term structural integrity. In , CSA G40.21 establishes requirements for structural quality steel plates, shapes, and hollow sections, mirroring ASTM grades like A36 and A572 but using metric units—such as 300W (equivalent to 44 yield) and 350W (50 )—to align with national building codes. For forged components, ASTM A668 covers untreated and heat-treated carbon and forgings for general industrial use in non-critical applications, specifying classes based on mechanical properties rather than exact compositions to accommodate varied processes. A key distinction in HSLA steels under these standards is the microalloying with elements like at levels of 0.01-0.05% by weight, which promotes grain refinement during rolling, enhancing strength and toughness without significantly increasing carbon content.

Structural Shapes

Common Profiles

Structural steel profiles are standardized cross-sectional shapes designed to optimize strength, , and efficiency in applications. These shapes are engineered to provide resistance to various loads, such as bending, compression, and torsion, by distributing material strategically around the section's . Common profiles include open sections like I-beams, channels, and angles, as well as closed sections like hollow structural sections, each suited to specific structural roles based on their geometric properties. I-beams, also known as wide-flange (W) shapes in North American nomenclature, feature a central web flanked by two parallel flanges, creating a high moment of inertia that enhances resistance to bending moments. This configuration allows I-beams to support heavy loads over long spans with minimal material use, making them ideal for beams in floors, roofs, and bridges. Typical depths range from 4 to 100 inches, depending on the load requirements, with the flanges providing stability against lateral buckling. H-sections, denoted as HE (e.g., HEA, HEB, HEM) in European standards, serve as counterparts to I-beams and are particularly favored for column applications due to their robust flange-web junction that distributes compressive forces evenly. These profiles offer similar bending resistance to I-beams but with proportions optimized for axial loading in multi-story buildings, where vertical load transfer is paramount. Their design emphasizes symmetry and thickness to prevent local under high stresses. Channels, referred to as C or U shapes, consist of a web with one flange extending from each side, forming a C-like cross-section suitable for light framing and secondary structural elements. This profile provides moderate resistance to in one direction and is commonly used in purlins, lintels, and edge beams where attachment to other members is needed via the open side. The unequal flange lengths in some variants allow for tailored in specific orientations. Angles, or L-shapes, feature two legs that can be equal or unequal in length, offering versatility for bracing, framing, and connection elements in trusses and frames. Equal-leg angles provide balanced properties for diagonal bracing against lateral forces, while unequal-leg versions concentrate for directional support, such as in stair stringers or lintels. Their simplicity facilitates and bolting in assembly. Hollow structural sections (HSS) include square hollow sections (SHS) and rectangular hollow sections (RHS), which enclose a void within four walls, providing excellent torsional resistance and aesthetic appeal for exposed applications. SHS offer uniform properties in all directions, ideal for columns and posts, whereas RHS allow customization of depth and width for beam-like behavior in facades or canopies. These closed profiles also minimize drag in wind-exposed structures due to their streamlined form. A key property defining the performance of these profiles is the , calculated as Z=IyZ = \frac{I}{y}, where II is the about the relevant axis and yy is the distance from the to the extreme ; this value indicates the section's capacity to resist stress without yielding. Profiles are defined under standards such as those from the American Institute of Steel Construction (AISC) and European norms like EN 10365, ensuring consistency in design and fabrication.

Dimensions and Tolerances

Structural steel shapes are produced to standardized dimensions that facilitate , fabrication, and assembly in projects. In , the American Institute of Steel Construction (AISC) Steel Construction Manual provides detailed tables for wide (W) shapes, where nominal dimensions are specified alongside weights per unit length. For example, the W12x26 shape has a nominal depth of 12 inches and weighs 26 pounds per foot, with actual measured dimensions typically including a depth of 12.22 inches and width of 6.49 inches. In and internationally, the EN 10365 standard defines nominal dimensions and masses for hot-rolled I and H sections, including parallel- IPE profiles and tapered- IPN profiles. This standard covers a range of sizes, such as IPE sections from 80 mm to 600 mm in height, ensuring consistency across manufacturers for sections used in beams and columns. Tolerances ensure that these dimensions meet quality requirements for structural performance and interchangeability. Under ASTM A6, which governs general requirements for rolled structural steel shapes in , tolerances for cross-sectional dimensions include a maximum overage of 1/4 inch and underage of 3/16 inch for width in wide shapes. Straightness tolerances limit camber and sweep to 1/8 inch times the length in feet divided by 10 (1/8 × L/10), applied to hot-rolled shapes to control deviations from a straight line. Mill practices introduce variations between hot-rolled and welded shapes that affect dimensional accuracy. Hot-rolled shapes, formed directly from billets through rolling mills, exhibit incidental camber up to 1/8 inch per 10 feet due to thermal distortions and cooling effects, while welded shapes, assembled from plates, may have tighter straightness controls but require additional checks for weld-induced distortions. These variations are governed by ASTM A6 for hot-rolled products and similar provisions in EN 10365 for European sections. Quality assurance relies on inspection certificates to verify compliance and enable traceability. The EN 10204 standard outlines types such as 3.1 and 3.2 certificates, where Type 3.1 provides test results from the manufacturer based on specific inspections, and Type 3.2 involves independent verification by a third party, ensuring full traceability back to the heat of steel for structural applications. Deviations within tolerances can impact on-site assembly, particularly fit-up between members. Gaps exceeding 1/16 inch, arising from cumulative mill and fabrication tolerances such as depth variations up to 1/4 inch, often necessitate shims to achieve proper alignment and bearing in connections, preventing stress concentrations and ensuring load transfer integrity.

Manufacturing Processes

Primary Steel Production

Primary steel production refers to the initial manufacturing of crude from raw materials, serving as the foundation for subsequent fabrication into structural shapes. In , global crude production totaled approximately 1.9 billion tons, with structural grades comprising about 10% of this output, primarily used in and applications. The process is dominated by two primary routes: the integrated blast furnace-basic oxygen furnace (BF-BOF) method and the scrap-based (EAF) method, which together account for nearly all production worldwide. The BF-BOF route, responsible for around 70% of global production, begins with the reduction of (primarily , Fe₂O₃) and coke (derived from coking coal) in a to produce molten . This , containing about 4-5% carbon and impurities, is then transferred to a basic oxygen furnace where high-purity oxygen is blown into the melt to oxidize excess carbon and other elements, resulting in basic oxygen with approximately 99% iron purity. The process requires significant energy input from coal and generates substantial byproducts like and gases. In contrast, the EAF route accounts for about 30% of global production and is more energy-efficient, relying on recycled scrap steel as the primary feedstock melted by electric arcs from graphite electrodes. This method consumes 400-500 kWh of electricity per ton of steel, making it suitable for regions with abundant scrap supplies and renewable energy sources. EAF allows for faster cycles and greater flexibility in adjustments compared to BF-BOF. Following either route, the molten steel undergoes secondary refining through ladle metallurgy to achieve precise chemical composition, deoxidization, and inclusion removal for structural applications requiring specific strength and ductility. This involves stirring the steel in a ladle with argon gas, adding alloys like manganese, silicon, and vanadium, and sometimes vacuum degassing to reduce hydrogen and nitrogen levels. The refined steel is then solidified via continuous casting, where it is poured into water-cooled molds to form slabs, blooms, or billets—semi-finished products ready for rolling into structural shapes. Over 90% of global steel is now produced using continuous casting for improved quality and yield. Environmental considerations are critical in primary steel production, as the BF-BOF route emits approximately 1.8 tons of CO₂ per ton of due to coal and chemical reduction processes, while the EAF route emits about 0.5 tons of CO₂ per ton, mainly from and scrap melting. These figures highlight the potential for EAF expansion and process innovations to reduce the steel industry's overall , which accounts for 7-9% of global emissions.

Fabrication and Forming

Fabrication and forming of structural involve transforming steel slabs or billets into usable shapes and components through mechanical and processes, ensuring the material meets strength, dimensional, and performance requirements for applications. These downstream processes build on primary steel production by shaping and assembling elements like beams, columns, and plates, often in specialized mills or fabrication shops. Key methods include hot and forming techniques, followed by cutting, , and rigorous to achieve precise geometries and defect-free assemblies. Hot rolling is the primary method for producing large structural shapes such as I-sections and wide-flange beams, where steel slabs are reheated to approximately 1200°C in a soaking pit or furnace to make the material ductile for deformation. The heated slabs are then passed through a series of rolling mills, with the process occurring at temperatures between 900°C and 1100°C to form the desired cross-sections while maintaining microstructural integrity and avoiding excessive cooling that could cause cracking. This high-temperature deformation allows for efficient production of heavy sections up to several inches thick, resulting in shapes with good and , though the surface may exhibit that requires removal prior to further processing. Cold forming, in contrast, is employed for thinner structural sections like channels, angles, and light framing members, where steel strips or sheets are shaped at or near using roll-forming machines or press-braking without reheating. This process enhances surface finish and dimensional accuracy compared to hot rolling, as it avoids oxidation and scale formation, but it introduces challenges such as springback—elastic recovery after forming that can distort shapes if not compensated for through over-bending or with lower yield strength. Cold-formed sections, typically under 0.25 inches thick, offer higher strength-to-weight ratios due to during deformation, making them suitable for applications requiring precision and resistance after galvanizing. Welding joins fabricated steel components into assemblies, with (SAW) commonly used in shops for longitudinal seams and flange splices in heavy beams due to its high deposition rates and deep penetration on thick sections up to 5 inches. For field connections and finer work, (MIG) and (TIG) are preferred, offering versatility for fillet and groove welds with good control over heat input to minimize . Preheating to around 100°C is often required for sections thicker than 1 inch to reduce hydrogen-induced cracking and improve weld toughness, particularly in high-carbon equivalent steels, as specified in welding codes. Cutting prepares edges and creates openings in structural members, primarily using plasma arc or oxy-fuel methods for their efficiency on steel thicknesses from 0.25 to several inches. employs a high-velocity ionized gas jet to melt and eject material, achieving cleaner edges with minimal heat-affected zones on plates up to 2 inches thick, while oxy-fuel uses a preheated and oxygen stream for thicker sections where precision is less critical. Typical tolerances for these thermal cuts are ±1/16 inch (1.6 mm), ensuring compatibility with bolting or without excessive fit-up adjustments. Quality control throughout fabrication verifies material integrity and compliance with standards, employing nondestructive testing such as ultrasonic examination to detect internal flaws like laminations or weld discontinuities in beams and plates. Per AWS D1.1, ultrasonic testing uses calibrated equipment with acceptance criteria based on reflection amplitude and length of indications, rejecting defects exceeding 5% of the joint thickness for statically loaded structures. Visual inspections and dimensional checks complement these, ensuring overall fabrication adheres to tolerances and surface conditions that support structural performance.

Design Considerations

Material Selection

Material selection for structural steel involves evaluating key factors such as required mechanical properties, environmental conditions, economic considerations, availability, and impacts to ensure optimal performance and project viability. Strength requirements primarily dictate the choice of steel grade, with lower-strength options like S355 (minimum yield strength of 355 MPa) suitable for general structural applications where moderate loads are anticipated, while higher-strength grades such as S460 (minimum yield strength of 460 MPa) are selected for projects demanding greater load-bearing capacity to reduce weight. Grade properties, including yield and tensile strengths, are defined in standards like for European grades and ASTM specifications for North American ones. Cost is a critical factor, as carbon steels are generally more economical than alloy steels due to simpler composition and production processes, making them preferable for budget-constrained projects without specialized performance needs. Environmental exposure influences selection, with weathering steels like those conforming to ASTM A588 used for exposed structures such as bridges to form a protective rust layer that resists further corrosion without coatings. In highly corrosive sites, such as coastal or chemical processing areas, stainless steels with at least 10.5% chromium content are chosen for their superior resistance to pitting and crevice corrosion. Availability and regional standards affect , with EN-designated grades like S355 predominant in for compliance with Eurocode requirements, whereas ASTM grades such as A36 or A992 are standard in the United States to align with local building codes. emphasizes , particularly the high recycled content in (EAF) produced steels, which often exceed 90%, reducing embodied carbon and supporting certifications. A practical example is the selection of ASTM A992 steel for in the United States, valued for its consistent 50 (345 MPa) minimum yield strength that enables efficient, high-rise framing while meeting seismic and load demands.

Load and Durability Factors

Structural steel designs must account for various load types to ensure safety and performance. Dead loads represent the permanent weight of the structure itself, including the steel members, while live loads encompass variable or usage loads, such as personnel and . Environmental loads like and seismic forces are also critical; ASCE 7 outlines minimum design requirements for these, including wind speeds based on risk categories and seismic ground motions derived from site-specific hazard maps. Similarly, Eurocode 1 (EN 1991) specifies actions such as permanent loads (Gk), variable imposed loads (Qk), wind actions in EN 1991-1-4, and snow loads in EN 1991-1-3, with seismic addressed in EN 1998. To provide a margin against uncertainties, a typically ranging from 1.5 to 2.0 is applied in allowable stress design methods for structural steel. Durability of structural steel is enhanced through protective measures against and . protection commonly involves hot-dip galvanizing, which applies a with a minimum thickness of 99 μm (3.9 mils) for sections over 4.8 mm (3/16 in) thick, per ASTM A123 grade 80, providing long-term atmospheric . Alternatively, painting systems, such as multi-coat or finishes, offer barrier and can be applied over galvanized surfaces for duplex systems in aggressive environments. For resistance, intumescent expand when heated to form an insulating char layer, delaying temperature rise in members; these can achieve up to 2 hours of for loaded beams and columns, depending on section factors and thickness. Fatigue design addresses cyclic loading from repeated stresses, such as traffic or wind gusts, using S-N curves that plot stress range against the number of cycles to failure. These curves, categorized by detail type in standards like AISC 360, guide permissible stress ranges to prevent crack initiation and propagation; for example, the constant amplitude threshold for without attachments (Category A) is approximately 24 for , limiting the range to about 0.5 times the yield strength to ensure infinite life under typical conditions. In load and resistance factor design (LRFD), the design strength for yielding is ϕFy\phi F_y, where ϕ=0.90\phi = 0.90 for tension yielding and FyF_y is the yield strength; this must exceed the required strength from factored loads. This approach, along with allowable strength design (ASD) using Fy/ΩF_y / \Omega where Ω=1.67\Omega = 1.67, is calibrated to align with probabilistic reliability targets. To prevent brittle fracture at low temperatures, structural steel must meet notch toughness requirements, typically evaluated via Charpy V-notch (CVN) impact testing. AISC specifications mandate minimum average CVN values of 20 ft-lb at 21°C (70°F) for wide-flange shapes in seismic or low-temperature applications, with sampling from the web or to verify resistance to crack propagation under impact; lower test temperatures are specified for colder service environments. This ensures ductile behavior, avoiding the ductile-to-brittle transition common in ferritic steels below certain temperatures.

Applications and Case Studies

Building Construction

Structural steel plays a pivotal role in modern building construction, particularly through frameworks that form the backbone of high-rise structures. This approach involves a grid of steel columns and beams that support the building's weight and loads, enabling expansive open interiors without load-bearing walls. In high-rises, these frameworks provide the necessary stability, with moment-resisting frames commonly used to counter lateral forces from and earthquakes by developing moments at beam-to-column connections. Key components include wide-flange beams and columns fabricated from rolled sections, which carry primary loads, and corrugated metal decking that serves as a base for . Composite floor systems integrate these elements with slabs poured over the decking and connected to steel joists or beams via shear studs, creating a synergistic structure where handles tension and compression for improved and resistance. One major advantage of structural steel in buildings is its rapid erection, often up to 20% faster than for multi-story offices due to off-site of components, which can reduce overall site time by 30-50%. Iconic examples illustrate this: the (1931) utilized approximately 57,000 tons of steel in its riveted skeleton frame to reach 381 meters, while the (completed 2015) employed high-strength steel plates in concrete-encased supercolumns and a steel mega-frame to achieve 632 meters with 25% less material than a conventional . In buildings featuring a 6m high first floor and a courtyard-style (回字形) second floor layout, structural steel is recommended for its ability to handle large spans without numerous columns, facilitating open spaces and flexible designs suitable for such configurations. Additionally, steel structures enable faster assembly, often completing erection in days compared to weeks for traditional methods, benefiting overall project timelines. Compared to brick-mixed structures, which require more walls and limit spans, steel offers advantages in long-term maintenance and modifications, with minimal upkeep and easier adjustments without major reconstruction. Challenges in long-span applications include floor vibrations from human activity, addressed through tuned mass dampers installed on steel beams to absorb and dissipate energy, ensuring occupant comfort in spans exceeding 20 meters.

Infrastructure Projects

Structural steel plays a pivotal role in bridge construction, enabling diverse designs such as and systems that distribute loads efficiently across spans. bridges utilize triangulated frameworks of steel members to support compressive and tensile forces, while bridges employ I-shaped beams for straightforward, cost-effective spanning of shorter to medium distances. In suspension bridges, main cables composed of high-strength parallel wire strands, typically made from 270 ksi (1,860 MPa) steel wires, bear the primary tension loads, allowing for iconic long-span structures. Weathering steel, a high-strength low-alloy variant, is widely used in bridges to form a protective that inhibits further , enabling maintenance-free spans with design lives up to 120 years under appropriate environmental conditions. Orthotropic steel decks, featuring a stiffened plate with longitudinal ribs and transverse floor beams, are particularly suited for long bridges due to their lightweight construction and high torsional rigidity, reducing dead loads and facilitating rapid erection. Notable examples include the , completed in 1937 and utilizing approximately 83,000 tons of structural steel for its towers, cables, and deck, and the , opened in 2000, which incorporates 82,000 tonnes of steel protected by corrosion-resistant coatings and alloys to withstand marine exposure. Beyond bridges, structural steel supports essential like transmission towers, stadiums, and pipelines. Lattice or tubular steel towers provide robust frameworks for overhead power lines, leveraging high-strength angles or for and load resistance in remote areas. In stadiums, steel trusses and hollow sections form expansive roofs and cantilevered seating, ensuring clear spans and spectator safety. For pipelines, structural steel and supports handle high-pressure fluid transport, often in welded configurations for durability in harsh terrains. The performance of structural steel in infrastructure withstands dynamic demands, including high fatigue resistance to repetitive traffic loads through detail designs that minimize stress concentrations, as outlined in fatigue evaluation guidelines ensuring service lives beyond 75 years. Seismic detailing incorporates base isolators, such as elastomeric or friction pendulum bearings, to decouple superstructures from ground motions, reducing acceleration forces by up to 80% and preventing collapse in earthquake-prone regions. For sustainability, modular structural steel components enable quick assembly in disaster recovery, with prefabricated panels and beams deployable in days to restore critical links like bridges, minimizing downtime and environmental impact compared to traditional methods.

References

  1. https://www.aisc.org/globalassets/aisc/publications/white-papers/structural_steel_industry_overview_2018.pdf
  2. https://www.matweb.com/search/datasheet.aspx?MatGUID=afc003f4fb40465fa3df05129f0e88e6
  3. https://www.infra-metals.com/resources/astm-structural-steel-standards/
  4. https://www.azom.com/article.aspx?ArticleID=6022
  5. https://www.aisc.org/sustainability/made-in-america/
  6. https://www.aisc.org/publications/steel-standards/aisc-360/
  7. https://www.sciencedirect.com/topics/engineering/structural-steel
  8. https://web.mit.edu/1.51/www/pdf/chemical.pdf
  9. https://www.steelconstruction.info/Steel_material_properties
  10. https://eurocodeapplied.com/design/en1993/steel-design-properties
  11. https://nvlpubs.nist.gov/nistpubs/Legacy/NCSTAR/ncstar1-3d.pdf
  12. https://www.matweb.com/search/datasheet.aspx?bassnum=MS0001
  13. https://www.bu.edu/moss/mechanics-of-materials-strain/
  14. https://www.aisc.org/globalassets/nsba/design-resources/steel-bridge-design-handbook/b901_sbdh_chapter1.pdf
  15. https://nvlpubs.nist.gov/nistpubs/nbstechnologic/nbstechnologicpaperT206.pdf
  16. https://www.britannica.com/technology/Bessemer-process
  17. https://www.asme.org/topics-resources/content/henry-bessemer
  18. https://www.ice.org.uk/what-is-civil-engineering/infrastructure-projects/tay-bridges
  19. https://www.britannica.com/place/Home-Insurance-Company-Building
  20. https://www.britannica.com/technology/open-hearth-process
  21. https://www.sciencedirect.com/topics/engineering/bessemer-process
  22. https://www.structuremag.org/article/ashtabula-bridge-failure/
  23. https://www.uc.edu/content/dam/refresh/cont-ed-62/olli/winter-25-handouts/gildedage7.pdf
  24. https://pmc.ncbi.nlm.nih.gov/articles/PMC8071465/
  25. https://www.aedmetals.com/news/the-history-of-dual-phase-advanced-high-strength-steel-and-its-introduction-into-racing
  26. https://www.centralsteelservice.com/the-emergence-of-corten-steel-everywhere/
  27. https://www.sciencedirect.com/journal/computer-aided-design/vol/12/issue/2
  28. https://www.computer.org/csdl/magazine/an/2024/04/10723797/21dMvPRpjjO
  29. https://greensteelworld.com/steelmaking-in-eafs-produces-75-lower-co2-emissions-validates-independent-study
  30. https://www.researchgate.net/publication/395408400_Structural_Behaviour_and_Design_Optimization_of_Hybrid_Steel-Concrete-FRP_Systems_for_Tall_Buildings_and_Bridges
  31. https://www.tatasteeluk.com/construction/case-studies/burj-khalifa
  32. https://global.ctbuh.org/resources/papers/download/1664-developments-in-us-building-codes-for-seismic-resistant-steel-buildings.pdf
  33. https://www.ussteel.com/sustainability/roadmap-to-2050
  34. https://www.ferolabs.com/insights/post/how-ai-helps-accomplish-green-steel-goals
  35. https://www.womicsteel.com/uploads/BS_EN_10025_2_2019-Hot-rolled-products-of-structural-steels-Part-2-Technical-delivery-conditions-for-non-alloy-structural-steels.pdf
  36. https://fractory.com/structural-steels-s235-s275-s355-s420-and-their-properties/
  37. https://single-market-economy.ec.europa.eu/sectors/construction/construction-products-regulation-cpr_en
  38. https://www.gov.uk/guidance/eu-construction-products-regulation-and-ce-marking-including-uk-product-contact-point-for-construction-products
  39. https://cemarking.net/ce-marking-of-fabricated-structural-steelwork-under-the-construction-products-regulation/
  40. https://www.iso.org/standard/54737.html
  41. https://www.iso.org/obp/ui/#!iso:std:iso:630:-1:ed-2:v1:en
  42. https://cdn.standards.iteh.ai/samples/73842/ece7bf62092e4d41a9dc7ae88a3a645c/ISO-630-2-2021.pdf
  43. https://www.corten-a-b.com/products/en-10025-5-s355j2w-steel-plate-weather-resistant-steel-sheet_5.html
  44. https://www.brownmac.com/products/weather-resistant-steel-plate/
  45. https://www.aisc.org/publications/steel-standards/
  46. https://www.csagroup.org/store/product/G40.20-13-G40.21-13/
  47. https://www.astm.org/a0036_a0036m-14.html
  48. https://www.astm.org/a0572_a0572m-12.html
  49. https://www.astm.org/Standards/A514.htm
  50. https://www.aisc.org/Specification-for-Structural-Steel-Buildings-ANSIAISC-360-22-Download
  51. https://dl.asminternational.org/technical-books/monograph/120/chapter/2266468/High-Strength-Low-Alloy-Steels
  52. https://beamdimensions.com/database/American/AISC/W_shapes/W12x26/
  53. https://www.montanstahl.com/blog/en-10365-the-european-norm-for-structural-sections-in-steel/
  54. https://www.aisc.org/globalassets/modern-steel/steelwise/102006_30758_steelwise_tolerances.pdf
  55. https://www.seacolorado.org/docs/Constructability_Considerations_Expectations_vs_Reality.pdf
  56. https://www.unionstahl.com/types-of-test-certificates-and-their-significance/?lang=en
  57. https://worldsteel.org/data/annual-production-steel-data/
  58. https://www.grandviewresearch.com/industry-analysis/structural-steel-market
  59. https://www.advancedenergy.com/en-us/about/news/blog/steel-manufacturing-requires-efficient-electric-arc-furnaces/
  60. https://www.ispatguru.com/ladle-metallurgy/
  61. https://worldsteel.org/wider-sustainability/sustainability-indicators/
  62. https://scholarsmine.mst.edu/cgi/viewcontent.cgi?article=4314&context=doctoral_dissertations
  63. https://www.academia.edu/20062786/Engineering_Materials_Hot_Rolling_and_Cold_Rolling
  64. https://www.aisc.org/globalassets/aisc/research-library/steel-construction-process-study-tolerances.pdf
  65. https://www.steelframing.org/how-cold-formed-steel-is-made
  66. https://pdhonline.com/courses/s101/s101.pdf
  67. https://www.aisc.org/globalassets/modern-steel/archives/2010/04/2010v04_welding_heavy_steel_full.pdf
  68. https://www.lincolnelectric.com/en/welding-and-cutting-resource-center/process-and-theory/what-is-preheat
  69. https://www.aisc.org/steel-solutions-center/engineering-faqs/2.2.-cutting-and-finishing-steel/
  70. https://www.thefabricator.com/thefabricator/article/plasmacutting/a-guide-to-mechanized-plasma-cutting
  71. https://www.aws.org/magazines-and-media/inspection-trends/it-feb-25-feature-02-hay-d11/
  72. https://aqcinspection.com/acceptance-criteria-for-ultrasonic-testing/
  73. https://www.gz-supplies.com/news/structural-steel-material-selection-factors-to-consider-for-different-applications/
  74. https://steelprogroup.com/high-strength-structural-steel/s460/
  75. https://hub.bostoncenterless.com/blog/carbon-vs-alloy-steel-strength-cost-applications
  76. https://www.steelconstruction.info/Weathering_steel
  77. https://www.imoa.info/molybdenum-uses/molybdenum-grade-stainless-steels/architecture/specifying-structural-sections.php?d=1
  78. https://www.bushwickmetals.com/structural-steel-grades-explained/
  79. https://parallax.aisc.org/sustainability.aspx
  80. https://www.steelgiantmarket.com/common-steel-grades-used-in-usa/
  81. https://law.resource.org/pub/us/cfr/ibr/003/asce.7.2002.pdf
  82. https://www.phd.eng.br/wp-content/uploads/2015/12/en.1991.1.1.2002.pdf
  83. https://www.aisc.org/globalassets/aisc/manual/15th-ed-ref-list/load-and-resistance-factor-design-specification-for-structural-steel-buildings.pdf
  84. https://galvanizeit.org/knowledgebase/article/astm-a123-a123m
  85. https://steelconstruction.info/Standard_corrosion_protection_systems_for_buildings
  86. https://steelconstruction.info/Fire_protecting_structural_steelwork
  87. https://protectiveeu.sherwin-williams.com/en/fire-protection-coating/products/steel-fire-protection/intumescent-coatings-for-steel
  88. https://www.aisc.org/globalassets/nsba/design-resources/steel-bridge-design-handbook/b912_sbdh_chapter12.pdf
  89. https://www.aisc.org/globalassets/aisc/publications/standards/a360-16w-rev-june-2019.pdf
  90. https://www.aisc.org/globalassets/aisc/research-library/statistical-analysis-of-charpy-v-notch-toughness-for-steel-wide-flange-structural-shapes.pdf
  91. https://www.aisc.org/globalassets/aisc/research-library/robustness-in-structural-steel-framing-systems.pdf
  92. https://www.steelconstruction.info/Composite_construction
  93. https://www.steelconstruction.info/images/b/b8/SCI_P300.pdf
  94. https://www.steelconstruction.info/images/4/43/SBE_M2.pdf
  95. https://www.aisc.org/globalassets/why-steel/innovative-systems-aug2019-f127-19.pdf
  96. https://www.ascemetsection.org/committees/history-and-heritage/landmarks/empire-state-building
  97. https://www.ice.org.uk/what-is-civil-engineering/infrastructure-projects/shanghai-tower
  98. https://www.enr.com/articles/40216-best-retailmixed-use-development---shanghai-tower
  99. https://techsteel.com.au/articles/what-are-the-benefits-of-steel-frame-construction-over-traditional-building-methods/
  100. https://westernsteel.com/the-pros-and-cons-of-steel-buildings-and-steel-building-types/
  101. https://www.mayflowersteelbuildings.com/brick-structures-vs-steel-structures/
  102. https://www.aisc.org/Application-of-Tuned-Mass-Dampers-To-Control-Vibrations-of-Composite-Floor-Systems
  103. https://www.steelconstruction.info/Floor_vibrations
  104. https://www.aisc.org/globalassets/nsba/design-resources/steel-bridge-design-handbook/b904_sbdh_chapter4.pdf
  105. https://www.structuremag.org/article/cable-stayed-bridges/
  106. https://www.ssab.com/en/brands-and-products/ssab-weathering/structures-and-bridges
  107. https://steelconstruction.info/Weathering_steel
  108. https://www.fhwa.dot.gov/bridge/pubs/hif22056.pdf
  109. https://www.goldengate.org/bridge/history-research/statistics-data/design-construction-stats/
  110. https://www.emerald.com/acmm/article/doi/10.1108/acmm.1999.12846cab.013/9481/Oresund-project-protected-by-International
  111. https://www.infra-metals.com/industries/structural-steel-in-communications-and-power/
  112. https://www.structuremag.org/article/round-hss-essentials/
  113. https://emirerristeel.com/structural-steel-pipe/
  114. https://www.fhwa.dot.gov/bridge/steel/pubs/nhi16016.pdf
  115. https://www.eng.buffalo.edu/mceer-reports/06/06-SP07.pdf
  116. https://acrow.com/solutions/emergency-bridges/
  117. https://www.escglobalgroup.com/post/modular-steel-bridges-esc-s-smart-solution-for-resilient-infrastructure
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